Diagnosis Procedure
- CHECK OPTICAL SENSOR POWER SUPPLY INPUT
- Turn ignition switch ON.
- Turn lighting switch AUTO.
- Check voltage between optical sensor harness connector and ground.
(+)
(-)
Voltage
(Approx.)
Optical sensor
Connector
Terminal
M174
1
Ground
5 V
Is the inspection result normal?
YES
GO TO 2.
NO
GO TO 4.
- CHECK OPTICAL SENSOR GROUND INPUT
- Turn the ignition switch OFF.
- Disconnect optical sensor connector.
- Turn the ignition switch ON.
- Check continuity between optical sensor harness connector and ground.
Optical sensor
Ground
Continuity
Connector
Terminal
M174
3
Yes
Is the inspection result normal?
YES
GO TO 3.
NO
GO TO 6.
- CHECK OPTICAL SENSOR SIGNAL OUTPUT
- Connect the optical sensor connector.
- Turn the ignition switch ON.
- With illuminating the optical sensor, check voltage between optical sensor harness connector and ground.
(+)
(-)
Condition
Voltage
(Approx.)
Optical sensor
Connector
Terminal
M174
2
Ground
Optical sensor
When illuminating
3.1 V or more *
When shutting off light
0.6 V or less
*: Illuminate the optical sensor. The value may be less than the standard if brightness is weak.
Is the inspection result normal?
YES
GO TO 7.
NO
Replace the optical sensor.
- CHECK OPTICAL SENSOR OPEN CIRCUIT
- Turn ignition switch OFF.
- Disconnect optical sensor connector and BCM connector.
- Check continuity between optical sensor harness connector and BCM harness connector.
Optical sensor
BCM
Continuity
Connector
Terminal
Connector
Terminal
M174
1
M97
15
Yes
Is the inspection result normal?
YES
GO TO 5.
NO
Repair or replace harness.
- CHECK OPTICAL SENSOR SHORT CIRCUIT
Check continuity between optical sensor harness connector and ground.
Optical sensor
Ground
Continuity
Connector
Terminal
M174
1
No
Is the inspection result normal?
YES
Replace BCM. to Removal and Installation .
NO
Repair or replace harness.
- CHECK OPTICAL SENSOR GROUND OPEN CIRCUIT
- Turn ignition switch OFF.
- Disconnect optical sensor connector and BCM connector.
- Check continuity between optical sensor harness connector and BCM harness connector.
Optical sensor
BCM
Continuity
Connector
Terminal
Connector
Terminal
M174
3
M97
26
Yes
Is the inspection result normal?
YES
Replace BCM. Refer to Removal and Installation .
NO
Repair or replace harness.
- CHECK OPTICAL SENSOR SIGNAL OPEN CIRCUIT
- Turn ignition switch OFF.
- Disconnect optical sensor connector and BCM connector.
- Check continuity between optical sensor harness connector and BCM harness connector.
Optical sensor
BCM
Continuity
Connector
Terminal
Connector
Terminal
M174
2
M97
19
Yes
Is the inspection result normal?
YES
GO TO 8.
NO
Repair or replace harness.
- CHECK OPTICAL SENSOR SHORT CIRCUIT
Check continuity between optical sensor harness connector and ground.
Optical sensor
Ground
Continuity
Connector
Terminal
M174
2
No
Is the inspection result normal?
YES
Replace BCM. Refer to Removal and Installation .
NO
Repair or replace harness.