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Stop Lamp Switch Check

  1. CHECK STOP LAMP SWITCH INPUT SIGNAL 

    With CONSULT-III 

    Check stop lamp switch ("STOP LAMP SW") in "DATA MONITOR" mode with CONSULT-III.

    DATA MONITOR

    Monitor item Condition
    STOP LAMP SW Brake pedal depressed: ON
    Brake pedal released: OFF

    Without CONSULT-III 

    1. Turn ignition switch OFF.
    2. Disconnect BCM.
    3. Check voltage between BCM connector M18 terminal 9 and ground.
      CONNECTOR TERMINAL VOLTAGE SPECIFICATION

      Connector Terminals Condition Voltage (V) (Approx.)
      (+) (-)
      M18 9 Ground Brake pedal depressed Battery voltage
      Brake pedal released 0

    OK or NG 

    OK: Stop lamp switch circuit is OK.

    NG: GO TO 2.

    Fig 1: Checking Voltage Between BCM Connector M18 Terminal 9 And Ground
    G04927699
  2. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 

    Check voltage between stop lamp switch harness connector E60 terminal 1 and ground.

    1 - Ground : Battery voltage 

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace harness between stop lamp switch power supply circuit and fuse.

    Fig 2: Checking Voltage Between Stop Lamp Switch Harness Connector E60 Terminal 1 And Ground
    G04927700
  3. CHECK STOP LAMP SWITCH OPERATION 

    Check continuity between stop lamp switch terminals 1 and 2.

    CONNECTOR TERMINAL CONTINUITY SPECIFICATION

    Component Terminals Condition Continuity
    Stop lamp switch 1 2 Brake pedal depressed Yes
    Brake pedal not depressed No

    OK or NG 

    OK: GO TO 4.

    NG: Replace stop lamp switch.

    Fig 3: Checking Continuity Between Stop Lamp Switch Terminals 1 And 2
    G04927701
  4. CHECK STOP LAMP SWITCH CIRCUIT 
    1. Check continuity between BCM connector M18 (A) terminal 9 and stop lamp switch connector E60 (B) terminal 2.

      9 - 2 : Continuity should exist. 

    2. Check continuity between BCM connector M18 (A) terminal 9 and ground.

      9 - Ground : Continuity should not exist. 

    OK or NG 

    OK: Check condition of harness and connector.

    NG: Repair or replace harness.

    Fig 4: Checking Continuity Between BCM Connector M18 Terminal 9 And Ground
    G04927702
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