Check Keyless Entry Control Module

CHECK KEYLESS ENTRY CONTROL MODULE.
Read the DTC of body integrated unit using Subaru Select Monitor.

NOTE: For detailed operation procedures, refer to "Application help".

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 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 4.

No: Repair or replace the harness.

Yes
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?
  
  Replace the keyless entry control module.
  
  No: Repair or replace the harness.