Code No.B1136 Stop lamp switch


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

DIAGNOSTIC FUNCTION



JUDGEMENT CRITERIA


Check Conditions
  • After OSS-ECU activation
Judgment Criterion
  • When the following conditions are met:
    The time when the OSS-ECU obtained the stop lamp switch status deviates 1.5 seconds from the time when the ETACS-ECU obtained it.

PROBABLE CAUSES



  • Malfunction of CAN bus line
  • Damaged wiring harness or connector (STP line, STP1 line)
  • ETACS-ECU malfunction
  • Malfunction of OSS-ECU

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics



Q. Is the check result normal?





STEP 2. Check of short to power supply, short of earth and open circuit in STP1 line between stop lamp switch connector and OSS-ECU connector


note Before the wiring harness check, check the intermediate connector, and repair if necessary.

Q. Is the check result normal?





STEP 3. Check of short to power supply, short of earth and open circuit in STP line between stop lamp switch connector and ETACS-ECU connector


Q. Is the check result normal?





STEP 4. M.U.T.-III other system data list




  • Item No.290: Stop lamp switch (Refer to GROUP 54A - ETACS, Service Data Reference Table .)

Q. Is the check result normal?





STEP 5. M.U.T.-III data list




  • Operate the brake pedal.
Operation state
 Item No.
 Check item
 Display
Brake pedal is depressed
 3
 Stop lamp switch
 ON
Brake pedal released
 OFF
OK: Operation state and data list display agree with each other.

Q. Is the check result normal?





STEP 6. Check whether the diagnosis code is reset.


Q. Is the diagnosis code set?