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C1AC8 BRAKE POWER SUPPLY BACKUP UNIT BR-437 < DTC/CIRCUIT DIAGNOSIS > C D E G H I J K L M A B BR N O P 3. Disconnect 12V battery cable from negative terminal. Refer to BR-6, "Precaution for Removing 12V Bat- 4. Disconnect the electrically-driven intelligent brake unit harness connector. 5. Disconnect the brake power supply backup unit harness connector. 6. Check the continuity between electrically-driven intelligent brake unit and brake power supply backup unit. 7. Check the continuity between brake power supply backup unit and ground. Is the inspection result normal? YES >> GO TO 17. NO >> Repair or replace error-detected parts and GO TO 17. 17. CHECK BRAKE POWER SUPPLY BACKUP UNIT POWER SUPPLY 1. Connect 12V battery cable to negative terminal. 2. Check the voltage between brake power supply backup unit and ground. 3. Turn the power switch ON without depressing the brake pedal. CAUTION: Never set the vehicle to READY. 4. Check the voltage between brake power supply backup unit and ground. Is the inspection result normal? YES >> GO TO 19. NO >> GO TO 18. 18. CHECK BRAKE POWER SUPPLY BACKUP UNIT POWER SUPPLY CIRCUIT 1. Turn the power switch OFF to exit CONSULT, and disconnect CONSULT from data link connector. 2. Close all doors (including back door), check that the room lamp is OFF, get out of the vehicle, and wait for 3 minutes or more with all doors closed. CAUTION: Never operate the vehicle while waiting. 3. Check the 15A fuse (#82). 4. Disconnect 12V battery cable from negative terminal. Refer to BR-6, "Precaution for Removing 12V Bat- 5. Check the continuity and for short circuit between harness connector terminal 6 of brake power supply backup unit and 15A fuse (#82). Is the inspection result normal? YES >> GO TO 19. Electrically-driven intelligent brake unit Brake power supply backup unit Continuity Connector Terminal Connector Terminal E34 31 B15 1 Existed 4 Not existed 5 Not existed 6 Not existed Brake power supply backup unit — Continuity Connector Terminal B15 1 Ground Not existed Brake power supply backup unit — Voltage (Approx.) Connector Terminal B15 6 Ground 9 − 16 V Brake power supply backup unit — Voltage (Approx.) Connector Terminal B15 6 Ground 9 − 16 V |