Power Will Not Turn On (Accessory Turns On, But Ignition Does Not Turn On)

CAUTION: When the keyless access CM is replaced with a new unit, and the battery ground terminal is connected, it will become ignition ON. Also, if the battery is disconnected, it will resume to a condition with the battery cut off.

Wiring diagram:

Push button start system Ref. to WIRING SYSTEM>Push Button Start System>WIRING DIAGRAM .

Fig 1: Push Button Start System Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

CHECK FUSE.
Check the fuse. Ref. to SECURITY AND LOCKS>Relay and Fuse .

Is the check result OK?
- Yes : Go to 2.
- No : Replace the fuse.
CHECK CONNECTOR.
Check the engagement of each connector and for any deformation or looseness.

Is the check result OK?
- Yes : Go to 3.
- No : Repair the connector, or replace harness.
CHECK WIRING HARNESS.
1. Disconnect the keyless access CM connector.
2. Using a tester, measure the voltage between the keyless access CM connector and chassis ground.
  Connector & terminal
  
  (B572) No. 2 (+) - Chassis ground (-):
Is the voltage between 8 V and 16 V?
- Yes : Go to 4.
- No : Repair or replace the open circuit of harness.
CHECK WIRING HARNESS (OPEN).
Using a tester, check continuity between the keyless access CM connector and chassis ground.

Connector & terminal

(B572) No. 11 - Chassis ground:

Is there continuity?
- Yes : Go to 5.
- No : Repair or replace the open circuit of harness.
CHECK IG RELAY 1 AND 2 (PUSH BUTTON START).
Check IG relay 1 (push button start) and IG relay 2 (push button start). Ref. to SECURITY AND LOCKS>IG Relay1 (Push Button Start)>INSPECTION .

Is the check result OK?
- Yes : Go to 6.
- No : Replace the relay.
CHECK WIRING HARNESS (OPEN).
1. Disconnect the keyless access CM connector and the IG relay 1 and 2 (push button start).
2. Using a tester, check continuity between the keyless access CM connector and the IG relay 1 (push button start) or IG relay 2 (push button start) connectors.
  Connector & terminal
  
  (B572) No. 9 - (B225) No. 34:
  
  (B574) No. 6 - (B225) No. 38:
Is there continuity?
- Yes : Go to 7.
- No : Repair or replace the open circuit of harness.
CHECK WIRING HARNESS (GROUND SHORT CIRCUIT).
Using a tester, check continuity between the keyless access CM connector and chassis ground.

Connector & terminal

(B572) No. 9 - Chassis ground:

(B574) No. 6 - Chassis ground:

Is there continuity?
- Yes : Repair or replace the short circuit of the harness.
- No : Go to 8.
CHECK KEYLESS ACCESS CM.
1. Connect the keyless access CM connector.
2. Using a tester, measure the voltage between the keyless access CM connector and chassis ground when the ignition is turned from OFF to ON.
  Connector & terminal
  
  (B572) No. 9 (+) - Chassis ground (-):
  
  (B574) No. 6 (+) - Chassis ground (-):
Did the voltage change from 1 V or less → +B-2 V or more?
- Yes : System is normal.
- No : Replace the keyless access CM. Ref. to SECURITY AND LOCKS>Keyless Access CM>REMOVAL .