Diagnosis Procedure
- INSPECTION START
Check which type the vehicle is equipped with.
Which type?
Without ICC models
GO TO STEP 2 .
With ICC models
GO TO STEP 6 .
- CHECK STOP LAMP SWITCH OPERATION
- Turn ignition switch OFF.
- Check the stop lamp when depressing and releasing the brake pedal.
Brake pedal Stop lamp Fully released Not illuminated Slightly depressed Illuminated
Is the inspection result normal?
YES
Perform INTERMITTENT INCIDENT .
NO
GO TO STEP 3 .
- CHECK STOP LAMP SWITCH POWER SUPPLY
- Turn ignition switch OFF.
- Disconnect stop lamp switch harness connector.
- Check the voltage between stop lamp switch harness connector and ground.
+ - Voltage Stop lamp switch Connector Terminal E57 3 Ground Battery voltage
Is the inspection result normal?
YES
GO TO STEP 4 .
NO
Perform trouble diagnosis for power supply circuit.
- CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT
- Disconnect HPCM harness connector.
- Check the continuity between stop lamp switch harness connector and HPCM harness connector.
+ - Continuity Stop lamp switch HPCM Connector Terminal Connector Terminal E57 4 B15 46 Existed - Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO STEP 5 .
NO
Repair or replace error-detected parts.
- CHECK STOP LAMP SWITCH
Refer to COMPONENT INSPECTION (STOP LAMP SWITCH) .
Is the inspection result normal?
YES
Perform INTERMITTENT INCIDENT .
NO
Replace stop lamp switch. Refer to EXPLODED VIEW WITH TORQUE SPECIFICATIONS .
- CHECK STOP LAMP SWITCH OPERATION - 1
- Turn ignition switch OFF.
- Check the stop lamp when depressing and releasing the brake pedal.
Brake pedal Stop lamp Fully released Not illuminated Slightly depressed Illuminated
Is the inspection result normal?
YES
GO TO STEP 7 .
NO
GO TO STEP 8 .
- CHECK STOP LAMP SWITCH OPERATION - 2
- Turn ignition switch ON.
- Check the stop lamp when depressing and releasing the brake pedal.
Brake pedal Stop lamp Fully released Not illuminated Slightly depressed Illuminated
Is the inspection result normal?
YES
GO TO STEP 8 .
NO
GO TO STEP 9 .
- CHECK STOP LAMP SWITCH INPUT SIGNAL
Check the voltage HPCM harness connector terminals and ground as per the following conditions.
+ - Condition Voltage
(Approx.)HPCM Connector Terminal B15 46 Ground Brake pedal Fully released 0 V Slightly depressed Battery voltage Is the inspection result normal?
YES
Perform INTERMITTENT INCIDENT .
NO
GO TO STEP 10 .
- CHECK ICC BRAKE HOLD RELAY
Check the voltage between ICC brake hold relay harness connector and ground.
+ - Voltage
(Approx.)ICC brake hold relay Connector Terminal E52 3 Ground 0 V Is the inspection result normal?
YES
GO TO STEP 10 .
NO
GO TO STEP 11 .
- CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT
- Turn ignition switch OFF.
- Disconnect stop lamp switch harness connector.
- Disconnect HPCM harness connector.
- Check the continuity between stop lamp switch harness connector and HPCM harness connector.
+ - Continuity Stop lamp switch HPCM Connector Terminal Connector Terminal E57 4 B15 46 Existed - Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO STEP 12 .
NO
Repair or replace error-detected parts.
- CHECK ICC BRAKE HOLD RELAY
Refer to COMPONENT INSPECTION (BRAKE HOLD RELAY) .
Is the inspection result normal?
YES
Check the harness between ICC brake hold relay and ADAS control unit. Refer to DIAGNOSIS PROCEDURE .
NO
Replace ICC brake hold relay.
- CHECK STOP LAMP SWITCH
Refer to COMPONENT INSPECTION (STOP LAMP SWITCH) .
Is the inspection result normal?
YES
Perform INTERMITTENT INCIDENT .
NO
Replace stop lamp switch. Refer to REMOVAL AND INSTALLATION .