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Diagnosis Procedure
1.CHECK STOP LIGHT SWITCH
  1. Select “Brake switch 1” and “Brake switch 2” in “Data List” mode of “BCM” using M.U.T.-III SE.
  2. Check “Brake switch 1” and “Brake switch 2” indication under the following condition.
Monitor itemConditionIndication
Brake switch 1Brake pedalDepressedOff
Not depressedOn
Brake switch 2DepressedOn
Not depressedOff
Is the indication normal?
Stop light switch is OK.
-1Brake switch 1: .
-2Brake switch 2: .
 
2.CHECK FUSE
Check that the following fuse is not blown (open).
Signal nameFuse No.
Battery power supply32 (5 A)
Is the fuse blown (open)?
Replace the blown (open) fuse after replacing the cause of blown (open).
.
 
3.CHECK STOP LIGHT SWITCH SIGNAL-1
  1. Ignition switch OFF.
  2. Disconnect BCM connector.
  3. Ignition switch ON.
  4. Check voltage between BCM harness connector and ground.
    (+)(–)ConditionVoltage
    BCM
    ConnectorTerminal
    E29111GroundStop light switch 1 ON (brake pedal is not depressed)9 – 16 V
    Stop light switch 1 OFF (brake pedal is depressed)0 V
Is the inspection normal?
INSPECTION END
.
 
4.CHECK STOP LIGHT SWITCH POWER SUPPLY CIRCUIT-1
  1. Ignition switch OFF.
  2. Disconnect stop light switch connector.
  3. Ignition switch ON.
  4. Check voltage between stop light switch harness connector and ground.
    (+)(–)Voltage
    Stop light switch
    ConnectorTerminal
    E384GroundBattery voltage
Is the inspection result normal?
.
Check harness for open or short between stop light switch and fuse.
 
5.CHECK STOP LIGHT SWITCH SIGNAL CIRCUIT-1
  1. Ignition switch OFF.
  2. Check continuity between stop light switch harness connector and BCM harness connector.
    Stop light switchBCMContinuity
    ConnectorTerminalConnectorTerminal
    E383E29111Existed
  3. Check continuity between stop light switch harness connector and ground.
    Stop light switch—Continuity
    ConnectorTerminal
    E383GroundNot existed
Is the inspection result normal?
.
Repair or replace harness.
 
6.CHECK STOP LIGHT SWITCH
Refer to Component Inspection.
Is the inspection result normal?
INSPECTION END
Replace stop light switch. Refer to Exploded View.
 
7.CHECK FUSE
Check that the following fuse is not blown (open).
Signal nameFuse No.
Buttery power supply21 (10 A)
Is the fuse blown (open)?
Replace the blown (open) fuse after replacing the cause of blown (open).
.
 
8.CHECK STOP LIGHT SWITCH SIGNAL-2
  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?
INSPECTION END
.
 
9.CHECK STOP LIGHT SWITCH POWER SUPPLY CIRCUIT-2
  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.
 
10.CHECK STOP LIGHT SWITCH SIGNAL CIRCUIT-2
  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.