Model Without Keyless Access With Push Button Start System: Wiring diagram

Keyless entry system Ref. to WIRING SYSTEM>Keyless Entry System>WIRING DIAGRAM .

Fig 1: Keyless UART COM Malfunction System Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC. 
   1. Insert the ignition key to the ignition key cylinder and remove.
   2. Read the DTC of body integrated unit using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

   Is DTC U1500 displayed? (Current malfunction)

   • Yes: Go to 2. 
   • No: Go to  7.
2. CHECK DTC. 
   1. Turn the ignition switch to OFF.
   2. Disconnect the body integrated unit and the TPMS & keyless entry control module or keyless entry control module connector.
   3. Connect the disconnected connectors.
   4. Insert the ignition key to the ignition key cylinder and remove.
   5. Read the DTC of body integrated unit using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

   Is DTC U1500 displayed? (Current malfunction)

   • Yes: Go to 3. 
   • No: Go to  7.
3. CHECK HARNESS (OPEN CIRCUIT). 
   1. Turn the ignition switch to OFF.
   2. Disconnect the body integrated unit and the TPMS & keyless entry control module or keyless entry control module connector.
   3. Using the tester, measure the resistance between terminals.

   Connector & terminal 

   With TPMS 

   (i171) No. 11 - (R221) No. 11:

   Without TPMS 

   (i171) No. 11 - (R80) No. 3:

   Is the resistance 10 Ω or less?

   • Yes: Go to 4. 
   • No: Repair the open circuit of harness or replace harness.
4. CHECK HARNESS (POWER SUPPLY CIRCUIT). 
   1. Turn the ignition switch to ON.
   2. Use a tester to measure the voltage between the terminals.

   Connector & terminal 

   With TPMS 

   (R221) No. 6 (+) - Chassis ground (-):

   (R221) No. 4 (+) - Chassis ground (-):

   Without TPMS 

   (R80) No. 4 (+) - Chassis ground (-):

   Is the voltage 10 V or more?

   • Yes: Go to 5. 
   • No: Repair the power supply circuit.
5. CHECK HARNESS (GROUND CIRCUIT). 

   Using the tester, measure the resistance between terminals.

   Connector & terminal 

   With TPMS 

   (R221) No. 5 - Chassis ground:

   Without TPMS 

   (R80) No. 7 - Chassis ground:

   Is the resistance 10 Ω or less?

   • Yes: Go to 6. 
   • No: Repair the ground circuit.
6. CHECK CONTROL MODULE. 
   1. Turn the ignition switch to OFF.
   2. Remove the TPMS & keyless entry control module or the keyless entry control module.
   3. Install a TPMS & keyless entry control module or keyless entry control module that was operating normally on another vehicle.

   Does it operate with the remote control key of another vehicle?

   • Yes: Replace the TPMS & keyless entry control module or keyless entry control module. Ref. to SECURITY AND LOCKS>Keyless Entry Control Module>REMOVAL . Ref. to WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System>REMOVAL .
   • No: Replace the body integrated unit. Ref. to SECURITY AND LOCKS>Body Integrated Unit .
7. CHECK CONNECTOR. 

   Check for poor contact of connectors used for keyless communication for poor contact.

   Is the check result OK?

   • Yes: Even if DTC is displayed, the circuit has returned to a normal condition at this time.

     Reproduce the failure, and then perform the diagnosis.

     NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
   • No: Repair or replace the poor contact of connector.