Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. 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 for stop lamp illumination under the following conditions.

Condition		Stop lamp
Brake pedal	Fully released	Not illuminated
Brake pedal	Slightly depressed	Illuminated

Is the inspection result normal?

YES

GO TO 4 .

GO TO 2 .

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

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 4 .

GO TO 3 .

DETECT MALFUNCTIONING PART
Check the following.
- 10 A fuse (No. 10)
- Harness for open or short between stop lamp switch and battery
- Loose or poor connection for each connector and harness
Repair open circuit, short to ground or short to power in harness or connectors.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Disconnect stop lamp switch harness connector.
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	Continuity
E38	2	E16	139	Existed

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

GO TO 6 .

GO TO 5 .

DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between ECM and stop lamp switch
- Loose or poor connection for each connector and harness
Repair open circuit, short to ground or short to power in harness or connectors.
CHECK STOP LAMP SWITCH
Refer to Component Inspection (Stop Lamp Switch) .

Is the inspection result normal?

YES

INSPECTION END

NO

Replace stop lamp switch. Refer to Removal and Installation .