Diagnosis Procedure

1. Turn ignition switch OFF.
2. Check the stop lamp when depressing and releasing the brake pedal.

OK or NG 

OK: GO TO  4.

NG: GO TO 2.

1. Disconnect stop lamp switch (2) harness connector.
   • ASCD brake switch (1)
   • Brake pedal (3)
   Fig 1: Identifying ASCD Brake Switch, Stop Lamp Switch And Brake Pedal

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2. Check voltage between stop lamp switch terminal 1 and ground with CONSULT or tester.

Fig 2: Checking Stop Lamp Switch Power Supply Circuit

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Voltage: Battery voltage 

OK or NG 

OK: GO TO  4.

NG: GO TO 3.

Check the following.

• 10 A fuse
• Harness for open and short between stop lamp switch and battery

Repair open circuit or short to ground or short to power in harness or connectors.

1. Disconnect stop lamp switch harness connector.
2. Disconnect ECM harness connector.
3. Check harness continuity between stop lamp switch terminal 2 and ECM terminal 106. Refer to Wiring Diagram .

   Continuity should exist  .

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

OK or NG 

OK: GO TO 5.

NG: Repair open circuit or short to ground or short to power in harness connectors.

Refer to "COMPONENT INSPECTION ".

OK or NG 

OK: GO TO 6.

NG: Replace stop lamp switch. Refer to , "REMOVAL AND INSTALLATION ".

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

INSPECTION END