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DTC C0023:62 [DSC HU/CM]

id040262003500

Outline

System malfunction location

Brake light

Detection condition

•  The DSC HU/CM detects any of the following conditions.

―  Brake light status signal input by signal wiring harness and brake light illumination request signal output by CAN communication do not match

―  Master cylinder pressure exceeds 20 MPa {204 kgf/cm², 2901 psi} even though brake light status signal input by signal wiring harness is off

―  Brake light status signal input by signal wiring harness and brake light status signal input by CAN communication do not match

Fail-safe

Refer to “DTC Table” and “Fail-safe Function Malfunction Contents Table”.(See DTC TABLE [DSC HU/CM (E)].)

Possible cause

•  DTCs are stored in the body control module (BCM).

―  DTCs related to the electrical supply unit (ESU) are stored.

•  Electrical supply unit (ESU) connector or terminals malfunction

•  DSC HU/CM connector or terminals malfunction

•  Short to ground in electrical supply unit (ESU) brake signal circuit

•  Short to power supply in electrical supply unit (ESU) brake signal circuit

•  Open circuit in electrical supply unit (ESU) brake signal circuit

•  Electrical supply unit (ESU) malfunction

•  DSC HU/CM malfunction

System malfunction location	Brake light
Detection condition	• The DSC HU/CM detects any of the following conditions. ― Brake light status signal input by signal wiring harness and brake light illumination request signal output by CAN communication do not match ― Master cylinder pressure exceeds 20 MPa {204 kgf/cm², 2901 psi} even though brake light status signal input by signal wiring harness is off ― Brake light status signal input by signal wiring harness and brake light status signal input by CAN communication do not match
Fail-safe	Refer to “DTC Table” and “Fail-safe Function Malfunction Contents Table”.(See DTC TABLE [DSC HU/CM (E)].)
Possible cause	• DTCs are stored in the body control module (BCM). ― DTCs related to the electrical supply unit (ESU) are stored. • Electrical supply unit (ESU) connector or terminals malfunction • DSC HU/CM connector or terminals malfunction • Short to ground in electrical supply unit (ESU) brake signal circuit • Short to power supply in electrical supply unit (ESU) brake signal circuit • Open circuit in electrical supply unit (ESU) brake signal circuit • Electrical supply unit (ESU) malfunction • DSC HU/CM malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT BODY CONTROL MODULE (BCM) FOR MALFUNCTION

•  Perform the DTC inspection for the body control module (BCM).
(See DTC INSPECTION.)

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)

No

Go to the next step.

2

INSPECT ELECTRICAL SUPPLY UNIT (ESU) 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 DSC HU/CM 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.

4

INSPECT ELECTRICAL SUPPLY UNIT (ESU) BRAKE SIGNAL CIRCUIT FOR SHORT TO GROUND

•  Inspect the applicable circuit for a short to ground.
(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 ELECTRICAL SUPPLY UNIT (ESU) BRAKE SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY

•  Inspect the applicable circuit for a short to power supply.
(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.

6

INSPECT ELECTRICAL SUPPLY UNIT (ESU) BRAKE SIGNAL CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for 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.

7

INSPECT ELECTRICAL SUPPLY UNIT (ESU) FOR MALFUNCTION

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

•  Measure the voltage at electrical supply unit (ESU) terminal 3L (vehicle wiring harness side) according to the brake pedal operation and verify if it changes as follows.

―  Brake pedal released: 1.0 V or less

―  Brake pedal depressed: B+

•  Does the voltage change according to the brake pedal operation?

Yes

Go to the next step.

No

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

(See ELECTRICAL SUPPLY UNIT (ESU) REMOVAL/INSTALLATION.)

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 work of depressing the brake pedal for 3 s or more and then releasing it for 5 times or more with the ignition switched ON (engine off or on).

•  Perform the DTC inspection for the DSC HU/CM.
(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 DSC HU/CM, then go to the next step.
(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].)

(See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)

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 BODY CONTROL MODULE (BCM) FOR MALFUNCTION • Perform the DTC inspection for the body control module (BCM). (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)
1		No	Go to the next step.
2	INSPECT ELECTRICAL SUPPLY UNIT (ESU) CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	INSPECT DSC HU/CM CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT ELECTRICAL SUPPLY UNIT (ESU) BRAKE SIGNAL CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT ELECTRICAL SUPPLY UNIT (ESU) BRAKE SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	INSPECT ELECTRICAL SUPPLY UNIT (ESU) BRAKE SIGNAL CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	INSPECT ELECTRICAL SUPPLY UNIT (ESU) FOR MALFUNCTION • Install/connect the part removed/disconnected during the troubleshooting procedure. • Measure the voltage at electrical supply unit (ESU) terminal 3L (vehicle wiring harness side) according to the brake pedal operation and verify if it changes as follows. ― Brake pedal released: 1.0 V or less ― Brake pedal depressed: B+ • Does the voltage change according to the brake pedal operation?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ELECTRICAL SUPPLY UNIT (ESU) REMOVAL/INSTALLATION.)
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 work of depressing the brake pedal for 3 s or more and then releasing it for 5 times or more with the ignition switched ON (engine off or on). • Perform the DTC inspection for the DSC HU/CM. (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 DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].) (See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
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.