Check Turn Signal Light System

WARNING: This page is about a different car, the 2023 Subaru Ascent. However, it is still accessible from the selected car via links, so may be relevant.

Wiring diagram:

Turn signal and hazard light system Ref. to WIRING SYSTEM>TURN SIGNAL LIGHT AND HAZARD LIGHT SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CHECK TURN SIGNAL LIGHT OPERATION .
1. Turn the ignition switch to ON.
2. Turn the turn signal light switch LH and RH to ON.
Does the turn signal light blink?

Yes: The turn signal light system is normal.

No: Go to 2.
CHECK CURRENT DATA .
Display the data of [Left turn signal input] and [Right turn signal input] using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

Does the display switch between [OFF] ←→ [ON], when the turn signal switch is turned from OFF to ON?

Yes: Go to 3.

No: Check the body integrated unit and replace it if defective.
- Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
- Replacement: Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .
CHECK TURN SIGNAL SWITCH .
Check the turn signal switch. Ref. to LIGHTING SYSTEM>HAZARD SWITCH>INSPECTION .

Is the turn signal switch OK?

Yes: Go to 4.

No: Replace the combination switch (light).
CHECK HARNESS .
1. Disconnect the connectors of body integrated unit and combination switch (light).
2. Check the harness between body integrated unit and combination switch (light).
  Connector & terminal
  
  (i171) No. 33 - (i73) No. 13:
  
  (i171) No. 38 - (i73) No. 15:
Is harness normal?

Yes: Check the body integrated unit and replace it if defective.
- Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
- Replacement: Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .
No: Repair or replace the harness.