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DTC B1B93:2A [DASH-ELECTRICAL SUPPLY UNIT]

id0702k8006600

Outline

System malfunction location

Recliner position sensor circuit malfunction

Detection condition

•  The dash-electrical supply unit detects that recliner position sensor circuit malfunction.

Fail-safe

•  Inhibits the seat position recall and seat position programming of the position memory system.

Possible cause

•  Position memory control module connector or terminal malfunction

•  Driver-side front seat malfunction

―  Short to ground in any of following recliner position sensor circuits:

•  Power supply circuit

•  Signal circuit

―  Short to power supply in any of following recliner position sensor circuits:

•  Power supply circuit

•  Signal circuit

―  Open circuit in any of following recliner position sensor circuits:

•  Power supply circuit

•  Signal circuit

―  Recliner motor and position sensor malfunction

•  Position memory control module malfunction

•  Dash-electrical supply unit malfunction

System malfunction location	Recliner position sensor circuit malfunction
Detection condition	• The dash-electrical supply unit detects that recliner position sensor circuit malfunction.
Fail-safe	• Inhibits the seat position recall and seat position programming of the position memory system.
Possible cause	• Position memory control module connector or terminal malfunction • Driver-side front seat malfunction ― Short to ground in any of following recliner position sensor circuits: • Power supply circuit • Signal circuit ― Short to power supply in any of following recliner position sensor circuits: • Power supply circuit • Signal circuit ― Open circuit in any of following recliner position sensor circuits: • Power supply circuit • Signal circuit ― Recliner motor and position sensor malfunction • Position memory control module malfunction • Dash-electrical supply unit malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT POSITION MEMORY CONTROL MODULE 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.

2

INSPECT RECLINER POSITION SENSOR POWER SUPPLY CIRCUIT AND SIGNAL CIRCUIT FOR SHORT TO GROUND

•  Verify that the position memory control module connector is disconnected.

•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:

―  Position memory control module terminal 2J

―  Position memory control module terminal 2L

•  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.

3

INSPECT RECLINER POSITION SENSOR POWER SUPPLY CIRCUIT AND SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY

•  Verify that the position memory control module connector is disconnected.

•  Connect the negative battery terminal.
(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

•  Switch the ignition ON (engine off or on).

•  Measure the voltage at the following terminals (wiring harness-side):

―  Position memory control module terminal 2J

―  Position memory control module terminal 2L

•  Is the voltage 0 V?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location, then go to the next step.

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

4

INSPECT POSITION MEMORY CONTROL MODULE 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 go to the next step.

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

No

Go to repair completion verification 2.

5

INSPECT RECLINER POSITION SENSOR AND RECLINER POSITION SENSOR CITRCUIT 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 FRONT SEAT 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	INSPECT POSITION MEMORY CONTROL MODULE CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
1		No	Repair or replace the malfunctioning location and perform the repair completion verification.
2	INSPECT RECLINER POSITION SENSOR POWER SUPPLY CIRCUIT AND SIGNAL CIRCUIT FOR SHORT TO GROUND • Verify that the position memory control module connector is disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Position memory control module terminal 2J ― Position memory control module terminal 2L • Is there continuity?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification. (See FRONT SEAT REMOVAL/INSTALLATION [(E)].)
2		No	Go to the next step.
3	INSPECT RECLINER POSITION SENSOR POWER SUPPLY CIRCUIT AND SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the position memory control module connector is disconnected. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off or on). • Measure the voltage at the following terminals (wiring harness-side): ― Position memory control module terminal 2J ― Position memory control module terminal 2L • Is the voltage 0 V?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location, then go to the next step. (See FRONT SEAT REMOVAL/INSTALLATION [(E)].)
4	INSPECT POSITION MEMORY CONTROL MODULE 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 go to the next step. (See POSITION MEMORY CONTROL MODULE REMOVAL/INSTALLATION [(E)].)
4		No	Go to repair completion verification 2.
5	INSPECT RECLINER POSITION SENSOR AND RECLINER POSITION SENSOR CITRCUIT 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 FRONT SEAT REMOVAL/INSTALLATION [(E)].)
5		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)].)
Repair completion verification 1		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.
Repair completion verification 2		No	DTC troubleshooting completed.