Check One-Touch Interior Light System

Trouble symptom: 

Spot map lights (switch in DOOR position) and reading lights do not turn on/off even if the one-touch interior light switch is pressed.

1. CHECK INTERIOR LIGHT ILLUMINATION. 
   1. Turn the spot map light switch to the DOOR position.
   2. Press the one-touch interior light switch.

      Do the indicators (displayed in MET) of spot map lights, reading lights and one-touch interior light turn on/off in accordance with one-touch interior light switch operation?

      Yes  The one-touch interior light switch system is normal.

      No  Go to  2.

      If only the one-touch interior light indicator does not turn on/off, check the LAN system. Ref. to BASIC DIAGNOSTIC PROCEDURE .

2. CHECK THE LIGHTS. 

   Check the spot map light and reading light.

   Are the spot map light and reading light normal?

   Yes  Go to  3.

   No  Replace the spot map light and reading light.

3. CHECK CURRENT DATA. 
   1. Turn the ignition switch to ON.
   2. Display the [One-touch All Interior Lights ON/OFF Switch Input] data using Subaru Select Monitor. Ref. to DATA MONITOR .

      Does the display switch between [OFF] ?? [ON] when the one-touch interior light switch is operated?

      Yes  Go to  5.

      No  Go to  4.

4. CHECK SWITCH. 

   Check the one-touch interior light switch.

   Is the one-touch interior light switch normal?

   Yes  Go to  5.

   No  Replace the one-touch interior light switch.

5. CHECK HARNESS. 
   1. Disconnect the connectors of body integrated unit and one-touch interior light switch.
   2. Check the harness between body integrated unit and one-touch interior light switch.

      Connector & terminal 

      (i84) No. 4 - (i374) No. 1:

      Is harness normal?

      Yes  Go to  6.

      No  Repair or replace the harness.

6. CHECK HARNESS. 

   Check the harness between one-touch interior light switch connector and chassis ground.

   Connector & terminal 

   (i374) No. 4 - Chassis ground:

   Is harness normal?

   Yes  Go to  7.

   No  Repair or replace the harness.

7. CHECK CURRENT DATA. 
   1. Turn the ignition switch to ON.
   2. Display the data of [Map lamp output] and [Battery Power Supply Output for Interior Lights] using Subaru Select Monitor. Ref. to DATA MONITOR .
   • Does the display of [Map lamp output] switch between [OFF] ?? [ON] when the one-touch interior light switch is operated?
   • Is [Battery Power Supply Output for Interior Lights] [ON]?

   Yes  Go to  8.

   No  Check the body integrated unit and replace it if defective.

   • Inspection: Ref. to BASIC DIAGNOSTIC PROCEDURE .
   • Replacement: Ref. to BODY INTEGRATED UNIT .
8. CHECK FUSE AND RELAY. 
   1. Turn the ignition switch to OFF.
   2. Check F/B fuse No. 26 and O/T ILL RELAY. Ref. to INSPECTION .

   Is the F/B fuse No. 26 and O/T ILL RELAY normal?

   Yes  Go to  9.

   No  Replace the defective fuse or relay.

9. CHECK HARNESS. 
   1. Disconnect the connectors of spot map light, reading light and O/T ILL RELAY.
   2. Measure the voltage between each connector and chassis ground.

   Connector & terminal 

   (B225) No. 36 (+) - Chassis ground (-):

   (B225) No. 34 (+) - Chassis ground (-):

   (R405) No. 1 (+) - Chassis ground (-):

   (R369) No. 1 (+) - Chassis ground (-):

   (R370) No. 1 (+) - Chassis ground (-):

   (R371) No. 1 (+) - Chassis ground (-):

   (R372) No. 1 (+) - Chassis ground (-):

   Yes  Go to  10.

   No  Repair or replace the harness.

10. CHECK HARNESS. 
    1. Disconnect the connectors of body integrated unit, spot map light, reading light and O/T ILL RELAY.
    2. Check the harnesses between each light connector and body integrated unit.

    Connector & terminal

    (i171) No. 11 - (B225) No. 35:

    (i171) No. 10 - (R405) No. 4:

    (i84) No. 9 - (R369) No. 3:

    (i84) No. 9 - (R370) No. 3:

    (i171) No. 16 - (R371) No. 3:

    (i171) No. 16 - (R372) No. 3:

    Is harness normal?

    Yes  Go to  11.

    No  Repair or replace the harness.

11. CHECK HARNESS. 

    Check the harnesses between spot map light and reading light connectors and body integrated unit.

    Connector & terminal 

    (R405) No. 13 - Chassis ground:

    (R369) No. 5 - Chassis ground:

    (R370) No. 5 - Chassis ground:

    (R371) No. 5 - Chassis ground:

    (R372) No. 5 - Chassis ground:

    Is harness normal?

    Yes  Check the body integrated unit and replace it if defective.

    • Inspection: BASIC DIAGNOSTIC PROCEDURE .
    • Replacement: BODY INTEGRATED UNIT .