Home

Mazdamanuals.com

DTC B1030:13 [DASH-ELECTRICAL SUPPLY UNIT (E)]

id0702k80006ka

Without Position Memory System (L.H.D.)

Outline

System malfunction location

Seat warmer unit (LH) circuit malfunction (Heater side)

Detection condition

•  The dash-electrical supply unit detects an open circuit in the seat warmer unit (LH) circuit.

Fail-safe

•  Stops the driver and front passenger’s seat warmer output.

Possible cause

•  Overheating protection function operates

•  Seat warmer control unit connector or terminal malfunction

•  Connector C-61 malfunction

•  Open circuit in any of following seat warmer unit (LH) circuits:

―  Control circuit

―  Ground circuit

•  Front seat (LH) malfunction

―  Seat warmer unit (LH) malfunction

•  Seat warmer control unit malfunction

•  Dash-electrical supply unit malfunction

System malfunction location	Seat warmer unit (LH) circuit malfunction (Heater side)
Detection condition	• The dash-electrical supply unit detects an open circuit in the seat warmer unit (LH) circuit.
Fail-safe	• Stops the driver and front passenger’s seat warmer output.
Possible cause	• Overheating protection function operates • Seat warmer control unit connector or terminal malfunction • Connector C-61 malfunction • Open circuit in any of following seat warmer unit (LH) circuits: ― Control circuit ― Ground circuit • Front seat (LH) malfunction ― Seat warmer unit (LH) malfunction • Seat warmer control unit malfunction • Dash-electrical supply unit malfunction

Diagnostic procedure

Step

Inspection

Results

Action

1

VERIFY IF MALFUNCTION IS DETECTED BY OVERHEATING PROTECTION FUNCTION

Note

•  The seat warmers only operate while the engine is running.

•  Move the vehicle to a cool location and switch the ignition off.

•  Wait for 30 min or more and start the engine.

•  Turn on the seat warmer switch (LH).

•  Does the seat warmer operate?

Yes

The system is normal. (Explain to the customer that the reason for DTC output is due to operation of overheating protection function of part.)

Perform the repair completion verification.

No

Go to the next step.

2

INSPECT SEAT WARMER CONTROL UNIT CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

3

INSPECT CONNECTOR C-61 FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

4

INSPECT SEAT WARMER UNIT (LH) CONTROL CIRCUIT AND GROUND CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

5

INSPECT SEAT WARMER UNIT (LH) FOR MALFUNCTION

•  Verify that the connector C-61 is disconnected.

•  Inspect for continuity between connector C-61 (seat (LH) harness-side) terminals 6B and 6A (wiring harness-side).

•  Is there continuity?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(See FRONT SEAT REMOVAL/INSTALLATION [(E)].)

6

INSPECT SEAT WARMER CONTROL UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the DTC inspection for the dash-electrical supply unit.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, replace the malfunctioning location and perform the repair completion verification.

(See SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION [(E)].)

No

Go to repair completion verification 2.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the DTC inspection for the dash-electrical supply unit.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the dash-electrical supply unit, then go to the next step.
(See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER (E)].)

(See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	VERIFY IF MALFUNCTION IS DETECTED BY OVERHEATING PROTECTION FUNCTION Note • The seat warmers only operate while the engine is running. • Move the vehicle to a cool location and switch the ignition off. • Wait for 30 min or more and start the engine. • Turn on the seat warmer switch (LH). • Does the seat warmer operate?	Yes	The system is normal. (Explain to the customer that the reason for DTC output is due to operation of overheating protection function of part.) Perform the repair completion verification.
No	Go to the next step.
2	INSPECT SEAT WARMER CONTROL UNIT CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	INSPECT CONNECTOR C-61 FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT SEAT WARMER UNIT (LH) CONTROL CIRCUIT AND GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT SEAT WARMER UNIT (LH) FOR MALFUNCTION • Verify that the connector C-61 is disconnected. • Inspect for continuity between connector C-61 (seat (LH) harness-side) terminals 6B and 6A (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See FRONT SEAT REMOVAL/INSTALLATION [(E)].)
6	INSPECT SEAT WARMER CONTROL UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Perform the DTC inspection for the dash-electrical supply unit. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, replace the malfunctioning location and perform the repair completion verification. (See SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION [(E)].)
No	Go to repair completion verification 2.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Perform the DTC inspection for the dash-electrical supply unit. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the dash-electrical supply unit, then go to the next step. (See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER (E)].) (See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].)
No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
No	DTC troubleshooting completed.

With Position Memory System (L.H.D.)

Outline

System malfunction location

Seat warmer unit (LH) circuit malfunction (Heater side)

Detection condition

•  The dash-electrical supply unit detects an open circuit in the seat warmer unit (LH) circuit.

Fail-safe

•  Stops the driver and front passenger’s seat warmer output.

Possible cause

•  Overheating protection function operates

•  Seat warmer control unit connector or terminal malfunction

•  Connector C-61 malfunction

•  Open circuit in seat warmer unit (LH) ground circuit

•  Front seat (LH) malfunction

―  Open circuit in seat warmer unit (LH) control circuit

―  Seat warmer unit (LH) malfunction

•  Seat warmer control unit malfunction

•  Dash-electrical supply unit malfunction

System malfunction location	Seat warmer unit (LH) circuit malfunction (Heater side)
Detection condition	• The dash-electrical supply unit detects an open circuit in the seat warmer unit (LH) circuit.
Fail-safe	• Stops the driver and front passenger’s seat warmer output.
Possible cause	• Overheating protection function operates • Seat warmer control unit connector or terminal malfunction • Connector C-61 malfunction • Open circuit in seat warmer unit (LH) ground circuit • Front seat (LH) malfunction ― Open circuit in seat warmer unit (LH) control circuit ― Seat warmer unit (LH) malfunction • Seat warmer control unit malfunction • Dash-electrical supply unit malfunction

Diagnostic procedure

Step

Inspection

Results

Action

1

VERIFY IF MALFUNCTION IS DETECTED BY OVERHEATING PROTECTION FUNCTION

Note

•  The seat warmers only operate while the engine is running.

•  Move the vehicle to a cool location and switch the ignition off.

•  Wait for 30 min or more and start the engine.

•  Turn on the seat warmer switch (LH).

•  Does the seat warmer operate?

Yes

The system is normal. (Explain to the customer that the reason for DTC output is due to operation of overheating protection function of part.)

Perform the repair completion verification.

No

Go to the next step.

2

INSPECT SEAT WARMER CONTROL UNIT CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

3

INSPECT CONNECTOR C-61 FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

4

INSPECT SEAT WARMER UNIT (LH) GROUND CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

5

INSPECT SEAT WARMER UNIT (LH) AND SEAT WARMER UNIT (LH) CONTROL CIRCUIT FOR MALFUNCTION

•  Verify that the connector C-61 and seat warmer control unit connectors are disconnected.

•  Inspect for continuity between seat warmer control unit terminal 1K (wiring harness-side) and connector C-61 (seat (LH) harness-side) terminal 6A (wiring harness-side).

•  Is there continuity?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(See FRONT SEAT REMOVAL/INSTALLATION [(E)].)

6

INSPECT SEAT WARMER CONTROL UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the DTC inspection for the dash-electrical supply unit.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, replace the malfunctioning location and perform the repair completion verification.

(See POSITION MEMORY CONTROL MODULE REMOVAL/INSTALLATION [(E)].)

No

Go to repair completion verification 2.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the DTC inspection for the dash-electrical supply unit.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the dash-electrical supply unit, then go to the next step.
(See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER (E)].)

(See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	VERIFY IF MALFUNCTION IS DETECTED BY OVERHEATING PROTECTION FUNCTION Note • The seat warmers only operate while the engine is running. • Move the vehicle to a cool location and switch the ignition off. • Wait for 30 min or more and start the engine. • Turn on the seat warmer switch (LH). • Does the seat warmer operate?	Yes	The system is normal. (Explain to the customer that the reason for DTC output is due to operation of overheating protection function of part.) Perform the repair completion verification.
No	Go to the next step.
2	INSPECT SEAT WARMER CONTROL UNIT CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	INSPECT CONNECTOR C-61 FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT SEAT WARMER UNIT (LH) GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT SEAT WARMER UNIT (LH) AND SEAT WARMER UNIT (LH) CONTROL CIRCUIT FOR MALFUNCTION • Verify that the connector C-61 and seat warmer control unit connectors are disconnected. • Inspect for continuity between seat warmer control unit terminal 1K (wiring harness-side) and connector C-61 (seat (LH) harness-side) terminal 6A (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See FRONT SEAT REMOVAL/INSTALLATION [(E)].)
6	INSPECT SEAT WARMER CONTROL UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Perform the DTC inspection for the dash-electrical supply unit. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, replace the malfunctioning location and perform the repair completion verification. (See POSITION MEMORY CONTROL MODULE REMOVAL/INSTALLATION [(E)].)
No	Go to repair completion verification 2.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Perform the DTC inspection for the dash-electrical supply unit. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the dash-electrical supply unit, then go to the next step. (See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER (E)].) (See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].)
No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
No	DTC troubleshooting completed.

Without Position Memory System (R.H.D.)

Outline

System malfunction location

Seat warmer unit (LH) circuit malfunction (Heater side)

Detection condition

•  The dash-electrical supply unit detects an open circuit in the seat warmer unit (LH) circuit.

Fail-safe

•  Stops the driver and front passenger’s seat warmer output.

Possible cause

•  Overheating protection function operates

•  Seat warmer control unit connector or terminal malfunction

•  Connector C-62 malfunction

•  Open circuit in seat warmer unit (LH) ground circuit

•  Front seat (LH) malfunction

―  Open circuit in seat warmer unit (LH) control circuit

―  Seat warmer unit (LH) malfunction

•  Seat warmer control unit malfunction

•  Dash-electrical supply unit malfunction

System malfunction location	Seat warmer unit (LH) circuit malfunction (Heater side)
Detection condition	• The dash-electrical supply unit detects an open circuit in the seat warmer unit (LH) circuit.
Fail-safe	• Stops the driver and front passenger’s seat warmer output.
Possible cause	• Overheating protection function operates • Seat warmer control unit connector or terminal malfunction • Connector C-62 malfunction • Open circuit in seat warmer unit (LH) ground circuit • Front seat (LH) malfunction ― Open circuit in seat warmer unit (LH) control circuit ― Seat warmer unit (LH) malfunction • Seat warmer control unit malfunction • Dash-electrical supply unit malfunction

Diagnostic procedure

Step

Inspection

Results

Action

1

VERIFY IF MALFUNCTION IS DETECTED BY OVERHEATING PROTECTION FUNCTION

Note

•  The seat warmers only operate while the engine is running.

•  Move the vehicle to a cool location and switch the ignition off.

•  Wait for 30 min or more and start the engine.

•  Turn on the seat warmer switch (LH).

•  Does the seat warmer operate?

Yes

The system is normal. (Explain to the customer that the reason for DTC output is due to operation of overheating protection function of part.)

Perform the repair completion verification.

No

Go to the next step.

2

INSPECT SEAT WARMER CONTROL UNIT CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

3

INSPECT CONNECTOR C-62 FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

4

INSPECT SEAT WARMER UNIT (LH) GROUND CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

5

INSPECT SEAT WARMER UNIT (LH) AND SEAT WARMER UNIT LH) CONTROL CIRCUIT FOR MALFUNCTION

•  Verify that the connector C-62 and seat warmer control unit connectors are disconnected.

•  Inspect for continuity between seat warmer control unit terminal 1K (wiring harness-side) and connector C-62 (seat (LH) harness-side) terminal 6A (wiring harness-side).

•  Is there continuity?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(See FRONT SEAT REMOVAL/INSTALLATION [(E)].)

6

INSPECT SEAT WARMER CONTROL UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the DTC inspection for the dash-electrical supply unit.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, replace the malfunctioning location and perform the repair completion verification.

(See SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION [(E)].)

No

Go to repair completion verification 2.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the DTC inspection for the dash-electrical supply unit.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the dash-electrical supply unit, then go to the next step.
(See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER (E)].)

(See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	VERIFY IF MALFUNCTION IS DETECTED BY OVERHEATING PROTECTION FUNCTION Note • The seat warmers only operate while the engine is running. • Move the vehicle to a cool location and switch the ignition off. • Wait for 30 min or more and start the engine. • Turn on the seat warmer switch (LH). • Does the seat warmer operate?	Yes	The system is normal. (Explain to the customer that the reason for DTC output is due to operation of overheating protection function of part.) Perform the repair completion verification.
No	Go to the next step.
2	INSPECT SEAT WARMER CONTROL UNIT CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	INSPECT CONNECTOR C-62 FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT SEAT WARMER UNIT (LH) GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT SEAT WARMER UNIT (LH) AND SEAT WARMER UNIT LH) CONTROL CIRCUIT FOR MALFUNCTION • Verify that the connector C-62 and seat warmer control unit connectors are disconnected. • Inspect for continuity between seat warmer control unit terminal 1K (wiring harness-side) and connector C-62 (seat (LH) harness-side) terminal 6A (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See FRONT SEAT REMOVAL/INSTALLATION [(E)].)
6	INSPECT SEAT WARMER CONTROL UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Perform the DTC inspection for the dash-electrical supply unit. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, replace the malfunctioning location and perform the repair completion verification. (See SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION [(E)].)
No	Go to repair completion verification 2.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Perform the DTC inspection for the dash-electrical supply unit. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the dash-electrical supply unit, then go to the next step. (See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER (E)].) (See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].)
No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
No	DTC troubleshooting completed.

With Position Memory System (R.H.D.)

Outline

System malfunction location

Seat warmer unit (LH) circuit malfunction (Heater side)

Detection condition

•  The dash-electrical supply unit detects an open circuit in the seat warmer unit (LH) circuit.

Fail-safe

•  Stops the driver and front passenger’s seat warmer output.

Possible cause

•  Overheating protection function operates

•  Seat warmer control unit connector or terminal malfunction

•  Connector C-62 malfunction

•  Open circuit in any of following seat warmer unit (LH) circuits:

―  Control circuit

―  Ground circuit

•  Front seat (LH) malfunction

―  Seat warmer unit (LH) malfunction

•  Seat warmer control unit malfunction

•  Dash-electrical supply unit malfunction

System malfunction location	Seat warmer unit (LH) circuit malfunction (Heater side)
Detection condition	• The dash-electrical supply unit detects an open circuit in the seat warmer unit (LH) circuit.
Fail-safe	• Stops the driver and front passenger’s seat warmer output.
Possible cause	• Overheating protection function operates • Seat warmer control unit connector or terminal malfunction • Connector C-62 malfunction • Open circuit in any of following seat warmer unit (LH) circuits: ― Control circuit ― Ground circuit • Front seat (LH) malfunction ― Seat warmer unit (LH) malfunction • Seat warmer control unit malfunction • Dash-electrical supply unit malfunction

Diagnostic procedure

Step

Inspection

Results

Action

1

VERIFY IF MALFUNCTION IS DETECTED BY OVERHEATING PROTECTION FUNCTION

Note

•  The seat warmers only operate while the engine is running.

•  Move the vehicle to a cool location and switch the ignition off.

•  Wait for 30 min or more and start the engine.

•  Turn on the seat warmer switch (LH).

•  Does the seat warmer operate?

Yes

The system is normal. (Explain to the customer that the reason for DTC output is due to operation of overheating protection function of part.)

Perform the repair completion verification.

No

Go to the next step.

2

INSPECT SEAT WARMER CONTROL UNIT CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

3

INSPECT CONNECTOR C-62 FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

4

INSPECT SEAT WARMER UNIT (LH) CONTROL CIRCUIT AND GROUND CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

5

INSPECT SEAT WARMER UNIT (LH) FOR MALFUNCTION

•  Verify that the connector C-62 is disconnected.

•  Inspect for continuity between connector C-62 (seat (LH) harness-side) terminals 6B and 6A (wiring harness-side).

•  Is there continuity?

Yes

Repair or replace the malfunctioning location and perform the repair completion verification.

(See FRONT SEAT REMOVAL/INSTALLATION [(E)].)

No

Go to the next step.

6

INSPECT SEAT WARMER CONTROL UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the DTC inspection for the dash-electrical supply unit.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, replace the malfunctioning location and perform the repair completion verification.

(See POSITION MEMORY CONTROL MODULE REMOVAL/INSTALLATION [(E)].)

No

Go to repair completion verification 2.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the DTC inspection for the dash-electrical supply unit.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the dash-electrical supply unit, then go to the next step.
(See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER (E)].)

(See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.