Clearance Light and Illumination Light System: Inspection: Trouble Symptom
Parking light and tail light do not illuminate or lights are weak
Wiring diagram:
Clearance light and illumination light system Ref. to WIRING SYSTEM>CLEARANCE LIGHT AND ILLUMINATION LIGHT SYSTEM>WIRING DIAGRAM
Perform unit inspection of the combination switch (light) and illumination light to check that there are no problems.
- CHECK ILLUMINATION LIGHT SYSTEM
.
- Turn the ignition switch to ON.
- Turn the lighting switch to the switch 1 (TAIL) position.
Does the illumination light come on?
Yes : Illumination light is normal.
No : Go to 2.
- CHECK BODY INTEGRATED UNIT
.
Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)
Is DTC displayed?
Yes : Perform the diagnosis for the displayed DTCs. Ref. to BODY CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST
No : Go to 3.
- CHECK POWER SUPPLY
.
Using the Subaru Select Monitor, display the following items in the [Data monitor] of [Body Control]. Ref. to COMMON (DIAGNOSTICS)>DATA MONITOR
- [BATT voltage (control)]
- [BATT voltage (BACKUP)]
- [IGN voltage]
Is the voltage 9 - 16 V?
Yes : Go to 4.
No : Check the body integrated unit and replace it if defective.
- Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE
- Replacement: Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT
- CHECK CLEARANCE LIGHT POWER SUPPLY CIRCUIT
.
- Turn the ignition switch to OFF.
- Disconnect the connector of body integrated unit.
- Measure the voltage between the body integrated unit connector and chassis ground.
Terminals
(B71) No. 7 (+) - Chassis ground (-):
Is the voltage 9 - 16 V?
Yes : Go to 5.
No : Check the body integrated unit and replace it if defective.
- Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE
- Replacement: Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT
- CHECK HARNESS
.
- Disconnect the connector of the light which did not illuminate.
- Check the harness between body integrated unit and each light.
Connector & terminal
Headlight RH (model without SRH)
(B71) No. 10 - (B121) No. 7:
Headlight LH (model without SRH)
(B71) No. 10 - (B122) No. 7:
Rear combination light RH
(i81) No. 1 - (R131) No. 4:
Rear combination light LH
(i81) No. 1 - (L131) No. 4:
License plate light RH
(i81) No. 1 - (Td45) No. 1:
License plate light LH
(i81) No. 1 - (Td46) No. 1:
Is harness normal?
Yes : Go to 6.
No : Repair or replace the defective part.
- CHECK THE LIGHTS
.
Apply battery voltage between light connector terminals.
CAUTION:When applying battery voltage, do not mix up the positive (+) side and the negative (-) side. Incorrect polarity connection may cause internal LED damage.
Connector & terminal
Headlight RH (model without SRH)
(B121) No. 7 (+) - (B121) No. 6 (-):
Headlight LH (model without SRH)
(B121) No. 7 (+) - (B122) No. 6 (-):
Rear combination light RH
(R131) No. 4 (+) - (R131) No. 2 (-):
Rear combination light LH
(L131) No. 4 (+) - (L131) No. 2 (-):
License plate light RH
(Td45) No. 1 (+) - (Td45) No. 2 (-):
License plate light LH
(Td46) No. 1 (+) - (Td46) No. 2 (-):
Does it illuminate?
Yes : Go to 7.
No : Repair or replace the defective part.
- CHECK HARNESS
.
Check the harness between each light connector and the chassis ground.
Connector & terminal
Rear combination light RH
(R131) No. 2 - Chassis ground:
Rear combination light LH
(L131) No. 2 - Chassis ground:
License plate light RH
(Td45) No. 2 - Chassis ground:
License plate light LH
(Td46) No. 2 - Chassis ground:
Is the resistance less than 10 Ω?
Yes : Check the body integrated unit and replace it if defective.
- Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE
- Replacement: Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT
No : Repair or replace the defective part.