B1136

DTC B1136 Stop light switch

CAUTION:
When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSTIC FUNCTION

When the stop light switch status is different from the brake switch information received from ETACS-ECU via CAN, OSS-ECU sets the DTC B1136, and displays the power supply system error warning screen to the multi information display of the combination meter.

DTC SET CONDITION

Check Conditions

- After OSS-ECU activation
Judgment Criterion

- When the following conditions are met:
1. When the stop light switch is OFF and the brake switch status is ON, 1.5 seconds or more have elapsed
2. When the stop light switch is ON and the brake switch status is OFF, 1.5 seconds or more have elapsed

TROUBLESHOOTING HINTS

- Damaged wiring harness or connector (short to ground or open circuit between stop light switch and OSS-ECU or between stop light switch and ETACS-ECU)
- ETACS-ECU malfunction
- Malfunction of OSS-ECU

DIAGNOSIS

STEP 1. Check of short to ground and open circuit in signal line between stop light switch connector and OSS-ECU connector

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the connector(s) or wiring harness.
STEP 2. Check of short to ground and open circuit in signal line between stop light switch connector and ETACS-ECU connector

Q. Is the check result normal?

YES Go to Step 3.
NO Repair the connector(s) or wiring harness.
STEP 3. Using scan tool MB991958, check other system data list.

Check the ETACS-ECU data list.

- Item No.290: Stop light switch Data List Reference Table .)

Q. Is the check result normal?

YES Go to Step 4.
NO Diagnose the ETACS-ECU. Symptom Chart.)
STEP 4. Using scan tool MB991958, check data list.

Check the OSS-ECU data list.

- Operate the brake pedal.





OK: Operation state and data list display agree with each other.


Q. Is the check result normal?

YES Go to Step 5.
NO Replace the OSS-ECU and register the VIN (Refer to Programming and Relearning).
STEP 5. Check whether the DTC is reset.

Q. Is the DTC set?

YES Replace the OSS-ECU and register the VIN (Refer to Programming and Relearning).
NO Intermittent malfunction is suspected How to Cope With Intermittent Malfunctions).