Diagnosis Procedure

1. Turn ignition switch OFF.
2. 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 4.

NO

GO TO 2.

1. Disconnect stop lamp switch harness connector.
2. Check the voltage between stop lamp switch harness connector and ground.

   +		-	Voltage
   Stop lamp switch
   Connector	Terminal
   E38	3	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 5.

NO

GO TO 3.

1. Turn ignition switch OFF.
2. Disconnect fuse block (J/B) harness connector.
3. Check the continuity between brake pedal position switch harness connector and fuse block (J/B) harness connector.

   Stop lamp switch		Fuse block (J/B)		Continuity
   Connector	Terminal	Connector	Terminal
   E38	3	E28	5M	Existed

4. Also check harness for short to ground.

Is the inspection result normal?

YES

GO TO 4.

NO

Repair or replace error-detected parts.

Check that the following fuse is not blowing.

Is the fuse blown (open)?

YES

Replace the fuse after repairing the applicable circuit.

NO

Perform trouble diagnosis for power supply circuit.

1. Disconnect stop lamp switch harness connector.
2. Disconnect ECM harness connector.
3. Check the continuity between stop lamp switch harness connector and ECM harness connector.

   Stop lamp switch		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   E38	4	E32	191	Existed

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

Is the inspection result normal?

YES

GO TO 6.

NO

Repair or replace error-detected parts.

Refer to Component Inspection (Stop Lamp Switch) .

Is the inspection result normal?

YES

INSPECTION END

NO

Replace stop lamp switch. Refer to Exploded View .