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Diagnosis Procedure
1.CHECK FUSE
Check that the following fuse is not blown (open).
Signal nameFuse No.
Battery power supply21 (10 A)
Is the fuse blown (open)?
Replace the blown (open) fuse after replacing the cause of blown (open).
.
 
2.CHECK STOP LIGHT SWITCH SIGNAL
  1. Ignition switch OFF.
  2. Disconnect BCM connector.
  3. Check voltage between BCM harness connector and ground.
    (+)(–)ConditionVoltage
    BCM
    ConnectorTerminal
    E29110GroundStop light switch 2 ON (brake pedal is depressed)9 – 16 V
    Stop light switch 2 OFF (brake pedal is not depressed)0 V
Is the inspection normal?
Replace BCM. Refer to Removal and Installation.
.
 
3.CHECK STOP LIGHT SWITCH POWER SUPPLY CIRCUIT
  1. Disconnect stop light switch connector.
  2. Check voltage between stop light switch harness connector and ground.
    (+)(–)Voltage
    Stop light switch
    ConnectorTerminal
    E381GroundBattery voltage
Is the inspection result normal?
.
Check harness for open or short between stop light switch and fuse.
 
4.CHECK STOP LIGHT SWITCH SIGNAL CIRCUIT
  1. Check continuity between stop light switch harness connector and BCM harness connector.
    Stop light switchBCMContinuity
    ConnectorTerminalConnectorTerminal
    E382E29110Existed
  2. Check continuity between stop light switch harness connector and ground.
    Stop light switch—Continuity
    ConnectorTerminal
    E382GroundNot existed
Is the inspection result normal?
.
Repair or replace harness.
 
5.CHECK STOP LIGHT SWITCH
Refer to Component Inspection.
Is the inspection result normal?
Replace BCM. Refer to Removal and Installation.
Replace stop light switch. Refer to Exploded View.