Diagnosis Procedure
- CHECK FUSE
Check that the following fuse in the fuse block (J/B) is not blown.
Signal name
Fuse No.
Battery power supply
10 (10 A)
Is the inspection normal?
YES
GO TO 2.
NO
Replace the blown fuse after replacing the cause of blowing.
- CHECK STOP LAMP SWITCH SIGNAL
- Disconnect BCM connector.
- Check voltage between BCM harness connector and ground.
(+)
(-)
Voltage
(Approx.)
BCM
Connector
Terminal
M21
25
Ground
Battery voltage
Is the inspection normal?
YES
GO TO 3.
NO
Check harness for open or short between BCM and fuse.
- CHECK STOP LAMP RELAY POWER SUPPLY CIRCUIT
- Disconnect stop lamp relay.
- Check voltage between stop lamp relay harness connector and ground.
(+)
(-)
Voltage
(Approx.)
Stop lamp relay
Connector
Terminal
E34
1
Ground
Battery voltage
3
Is the inspection result normal?
YES
GO TO 4.
NO
Check harness for open or short between stop lamp relay and fuse.
- CHECK STOP LAMP RELAY SIGNAL
- Connect stop lamp relay.
- Check voltage between BCM harness connector and ground.
(+)
(-)
Condition
Voltage
(Approx.)
BCM
Connector
Terminal
M21
27
Ground
Stop lamp switch
ON (Brake pedal is depressed)
Battery voltage
OFF (Brake pedal is not depressed)
0 V
Is the inspecting result normal?
YES
Replace BCM. Refer to Removal and Installation .
NO
GO TO 5.
- CHECK STOP LAMP RELAY SIGNAL CIRCUIT
- Disconnect stop lamp relay.
- Check continuity between stop lamp relay harness connector and BCM harness connector.
Stop lamp relay
BCM
Continuity
Connector
Terminal
Connector
Terminal
E34
5
M21
27
Yes
- Check continuity between stop lamp relay harness connector and ground.
Stop lamp relay
Ground
Continuity
Connector
Terminal
E34
5
No
Is the inspection result normal?
YES
GO TO 6.
NO
Repair or replace harness.
- CHECK STOP LAMP RELAY
Refer to Component Inspection (Stop Lamp Relay) .
Is the inspection result normal?
YES
GO TO 7.
NO
Replace stop lamp relay.
- CHECK STOP LAMP SWITCH POWER SUPPLY
- Connect stop lamp relay.
- Disconnect stop lamp switch connector.
- Check voltage between stop lamp switch harness connector and ground.
(+)
(-)
Voltage
(Approx.)
Stop lamp switch
Connector
Terminal
E38
2
Ground
Battery voltage
Is the inspection result normal?
YES
GO TO 8.
NO
GO TO 10
- CHECK STOP LAMP SWITCH GROUND CIRCUIT
Check continuity between stop lamp switch harness connector and ground.
Stop lamp switch
Ground
Continuity
Connector
Terminal
E38
1
Yes
Is the inspection result normal?
YES
GO TO 9.
NO
Repair or replace harness.
- CHECK STOP LAMP SWITCH
Refer to Component Inspection (Stop Lamp Switch) .
Is the inspection result normal?
YES
GO TO 11.
NO
Replace stop lamp switch. Refer to Exploded View .
- CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
- Disconnect stop lamp relay.
- Check continuity between stop lamp relay harness connector and stop lamp switch harness connector.
Stop lamp relay
Stop lamp switch
Continuity
Connector
Terminal
Connector
Terminal
E34
2
E38
2
Yes
- Check continuity between stop lamp relay harness connector and ground.
Stop lamp relay
Ground
Continuity
Connector
Terminal
E34
2
No
Is the inspection result normal?
YES
GO TO 11.
NO
Repair or replace harness.
- CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident .
Inspection End.