Check Keyless Entry Control Module

CHECK BODY INTEGRATED UNIT .
Read the DTC using Subaru Select Monitor.

NOTE: For detailed procedures, refer to "PC application help for Subaru Select Monitor".

Is DTC U1500 "KEYLESS UART COM. MALFUNCTION" displayed?

Yes: Go to 2.

No: Keyless entry control module is normal.
CHECK POWER SUPPLY .
1. Disconnect the keyless entry control module connector.
2. Measure the voltage between keyless entry control module connector and chassis ground.
  Connector & terminal
  
  Model without tire pressure monitoring system
  
  (R80) No. 4 (+) - Chassis ground (-):
  
  Model with tire pressure monitoring system
  
  (R221) No. 6 (+) - Chassis ground (-):
Is the voltage 10 V or more?

Yes: Go to 3.

No: Check the harness for open or short circuits between the keyless entry control module and the fuse.
CHECK POWER SUPPLY (MODEL WITH TPMS ONLY) .
Measure the voltage between connector and chassis ground.

Connector & terminal

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

IGN OFF: 0 V

IGN ON: 10 V or more?

Yes: Go to 4.

No: Check the harness for open or short circuits between the keyless entry control module and the fuse.
CHECK GROUND CIRCUIT .
Measure the resistance between keyless entry control module connector and chassis ground.

Connector & terminal

Model without tire pressure monitoring system

(R80) No. 7 - Chassis ground:

Model with tire pressure monitoring system

(R221) No. 5 - Chassis ground:

Is the resistance less than 10 Ω?

Yes: Go to 5.

No: Repair or replace the harness.
CHECK KEYLESS ENTRY CONTROL MODULE CIRCUIT .
1. Disconnect the body integrated unit connector.
2. Check the harness between keyless entry control module and body integrated unit.
  Connector & terminal
  
  Model without tire pressure monitoring system
  
  (i171) No. 11 - (R80) No. 3:
  
  Model with tire pressure monitoring system
  
  (i171) No. 11 - (R221) No. 11:
Is harness normal?

Yes: Replace the keyless entry control module.

No: Repair or replace the harness.