Turn Hazard Lights Do Not Illuminate: Wiring diagram

Power rear gate system Ref. to WIRING SYSTEM>Power Rear Gate System>WIRING DIAGRAM .

Fig 1: Turn Hazard Lights Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DATA MONITOR. 

   Using Subaru Select Monitor, check [IGN SW]. Ref. to POWER REAR GATE (DIAGNOSTICS)>Data Monitor .

   Does the data value change according to the ignition switch ON/OFF? (ON ←→ OFF)

   • Yes: Go to  4.
   • No: Go to 2. 
2. CHECK FUSE. 
   1. Turn the ignition switch to OFF.
   2. Check the fuse. Ref. to CHECK FUSE .

      Is the check result OK?

      • Yes: Go to 3. 
      • No: Replace the defective fuse. When the fuse is blown immediately, repair the short circuit.
3. CHECK HARNESS (POWER SUPPLY CIRCUIT). 
   1. Disconnect the PRG CM connector.
   2. Turn the ignition switch to ON.
   3. Measure the voltage between PRG CM connector and chassis ground.

      Connector & terminal 

      (R422) No. 10 (+) - Chassis ground (-):

   Is the voltage 10.5 V or more when the ignition switch is ON?

   • Yes: Go to 4. 
   • No: Repair or replace the open circuit of harness.
4. CHECK DATA MONITOR. 
   1. Turn the ignition switch to OFF.
   2. Connect the PRG CM connector. Ref. to INSTALLATION .
   3. Using Subaru Select Monitor, check [HAZARD]. Ref. to POWER REAR GATE (DIAGNOSTICS)>Data Monitor .
   4. Operate the power rear gate to open.

   Is the change of ON ←→ OFF detected?

   • Yes: Go to 5. 
   • No: Replace the PRG CM. Ref. to REMOVAL .
5. CHECK HAZARD SWITCH. 
   1. Turn the hazard switch to ON.
   2. Check that the hazard light blinks.

   Does the hazard light blink?

   • Yes: Go to 6. 
   • No: Replace the turn signal light & hazard light unit. Ref. to TURN SIGNAL LIGHT & HAZARD LIGHT UNIT .
6. CHECK HARNESS (OPEN CIRCUIT). 
   1. Turn the ignition switch to OFF.
   2. Disconnect the PRG CM connector.
   3. Disconnect the turn signal & hazard unit connector.
   4. Disconnect the hazard switch connector.
   5. Measure the resistance between PRG CM connector and turn signal light & hazard light unit, and hazard switch connector.

      Connector & terminal 

      (R423) No. 15 - (B32) No. 8:

      (B32) No. 8 - (i22) No. 2:

   Is the resistance less than 10 Ω?

   • Yes: Go to 7. 
   • No: Repair or replace the open circuit of harness.
7. CHECK HARNESS (GROUND SHORT CIRCUIT). 

   Measure the resistance between PRG CM connector and chassis ground.

   Connector & terminal 

   (R423) No. 15 - Chassis ground:

   Is the resistance 1 MΩ or more?

   • Yes: Go to 8. 
   • No: Repair or replace the short circuit of the harness.
8. CHECK HARNESS (SHORT CIRCUIT TO POWER SUPPLY). 

   Measure the voltage between PRG CM connector and chassis ground.

   Connector & terminal 

   (R423) No. 15 (+) - Chassis ground (-):

   Is the voltage less than 1 V?

   • Yes: Go to 9. 
   • No: Repair or replace the short circuit of the harness.
9. CHECK CONNECTOR. 

   Check for poor contact of connector.

   Is the check result OK?

   • Yes: A temporary change of voltage occurred.
   • No: Repair or replace the connector.