Check Interior Light System

Trouble symptom:

Spot map light, room light, trunk room light, luggage room light or rear gate light does not illuminate.

Wiring diagram:

Interior light system Ref. to WIRING SYSTEM>INTERIOR LIGHT SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

NOTE: Operate the appropriate switch according to the inspection condition.

CHECK INTERIOR LIGHT ILLUMINATION .
NOTE: Perform the check from step 2 since there is no switch provided for the trunk room light.
1. Turn the interior light switch to ON.
2. Check that the interior light operates properly.
Does the interior light illuminate?

Yes: Go to 7.

No: Go to 2.
CHECK THE LIGHTS .
1. Disconnect the connector of the light which did not illuminate.
2. Check between the connector terminals of the light (ON position).
  Connector & terminal Spot map light
  
  (Rf3) No. 1 - (Rf3) No. 13:
  
  Room light
  
  (Rf43) No. 2 - (Rf43) No. 1:
  
  Luggage room light
  
  (Db58) No. 2 - (Db58) No. 1:
3. Check between the connector terminals of light (door position).
  Connector & terminal Spot map light
  
  (Rf3) No. 1 - (Rf3) No. 4:
  
  Room light
  
  (Rf43) No. 2 - (Rf43) No. 3:
  
  Luggage room light
  
  (Db58) No. 2 - (Db58) No. 3:
  
  Rear gate light
  
  (Db59) No. 2 - (Db59) No. 3:
4. Check between the connector terminals of trunk room light.
  Connector & terminal Trunk room light
  
  (L133) No. 2 - (L133) No. 1:
- Is the resistance less than 1 Ω? (Except for spot map light)
- Is the resistance approximately 18 Ω? (Spot map light)
Yes: Go to 3.

No: Repair or replace the light.
CHECK FUSE .
Check the F/B fuse No. 26.

Is the fuse OK?

Yes: Go to 4.

No: Replace the fuse.
CHECK CONNECTOR .
Check the connecting condition of connector.

Is the connector firmly installed?

Yes: Go to 5.

No: Repair or replace faulty parts.
CHECK HARNESS .
1. Disconnect the connector of the light which did not illuminate.
2. Check the harnesses between light (ON position) connector and chassis ground.
  Connector & terminal Spot map light
  
  (Rf11) No. 13 - Chassis ground:
  
  Room light
  
  (Rf43) No. 1 - Chassis ground:
  
  Luggage room light
  
  (Db58) No. 1 - Chassis ground:
Is harness normal?

Yes: Go to 6.

No: Repair or replace the harness.
CHECK HARNESS .
Check the harness between the F/B fuse No. 26 (downstream side) and the light.

Connector & terminal Spot map light

F/B fuse No. 26 (downstream side) - (Rf11) No. 1:

Room light

F/B fuse No. 26 (downstream side) - (Rf43) No. 3:

Trunk room light

F/B fuse No. 26 (downstream side) - (L133) No. 2:

Luggage room light

F/B fuse No. 26 (downstream side) - (Db58) No. 2:

Rear gate light

F/B fuse No. 26 (downstream side) - (Db59) No. 2:

Is harness normal?

Yes: The interior light system is normal. (Except for trunk room light)

For trunk room light, check the operation. Go to 7.

No: Repair or replace the harness.
CHECK OPERATION .
1. Turn the interior light switch to DOOR.
  NOTE: The trunk room light is not provided with a switch.
2. Open a door, trunk lid or rear gate.
  - Check the spot map light or interior light: Open any door.
  - Check the trunk room light: Open the trunk lid.
  - Check the luggage room light or rear gate light: Open the rear gate.
Does the interior light illuminate?

Yes: The interior light system is normal.

No: Go to 8.
CHECK HARNESS .
Check the harnesses between light connector and body integrated unit.

Connector & terminal Spot map light

(Rf11) No. 4 - (i82) No. 10:

Room light

(Rf43) No. 3 - (i81) No. 9:

Trunk room light

(L133) No. 1 - (i83) No. 30:

Luggage room light

(Db58) No. 3 - (i83) No. 30:

Rear gate light

(Db59) No. 3 - (i83) No. 30:

Is harness normal?

Yes: Go to 9.

No: Repair or replace the harness.
CHECK CURRENT DATA .
Display the data of [Driver's door SW input], [P-door SW input], [Rear right door SW input], [Rear left door SW input] and [R Gate SW input] using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

Does the display switch between [OFF] ←→ [ON] when a door, trunk lid, or rear gate is opened/closed?

Yes: Replace the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .

No: Check the door switch and harness.