Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » P1805 brake switch
Diagnosis Procedure

1.CHECK STOP LAMP SWITCH CIRCUIT

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

Is the inspection result normal?

YES >> GO TO 4.

NO >> GO TO 2.

2.CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect stop lamp switch harness connector.
  3. Check the voltage between stop lamp switch harness connector and ground. 

Is the inspection result normal?

YES >> GO TO 4.

NO >> GO TO 3.

3.DETECT MALFUNCTIONING PART

Check the following.

  • 10 A fuse (No. 30)
  • Harness for open or short between stop lamp switch and battery

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

4.CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

  1. Disconnect stop lamp switch harness connector.
  2. Disconnect ECM harness connector.
  3. Check the continuity between ECM harness connector and stop lamp switch harness connector. 
  4. Also check harness for short to ground and short to power.

Is the inspection result normal?

YES >> GO TO 5.

NO >> Repair open circuit or short to ground or short to power in harness or connectors.

5.CHECK STOP LAMP SWITCH

Refer to EC, "Component Inspection (Stop Lamp Switch)".

Is the inspection result normal?

YES >> GO TO 6.

NO >> Replace brake pedal assembly. Refer to BR, "Removal and Installation".

6.CHECK INTERMITTENT INCIDENT

Refer to GI, "Intermittent Incident".

>> INSPECTION END

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    Component Inspection (Stop Lamp Switch)

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