Diagnostic Test
WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK STOP LAMP SWITCH CIRCUIT
- 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
Check intermittent incident. Refer to INTERMITTENT INCIDENT .
NO
GO TO STEP 2 .
- CHECK STOP LAMP SWITCH POWER SUPPLY
- Disconnect stop lamp switch harness connector.
- Check the voltage between stop lamp switch harness connector and ground.
Stop lamp switch Ground Voltage Connector Terminal E38 1 Ground Battery voltage
Is the inspection result normal?
YES
GO TO STEP 3 .
NO
Perform the trouble diagnosis for power supply circuit.
- CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT
- Disconnect ECM harness connector.
- Check the continuity between stop lamp switch harness connector and ECM harness connector.
Stop lamp switch ECM Continuity Connector Terminal Connector Terminal E38 2 E32 139 Existed - Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO STEP 4 .
NO
Repair or replace error-detected parts.
- CHECK STOP LAMP SWITCH
Check stop lamp switch. Refer to COMPONENT INSPECTION (STOP LAMP SWITCH) .
Is the inspection result normal?
YES
Check intermittent incident. Refer to INTERMITTENT INCIDENT .
NO
Replace stop lamp switch. Refer to REMOVAL AND INSTALLATION .