KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC B2003 SSP SYSTEM COMMUNICATION BUS GND SHORT-CIRCUIT

DTC DETECTING CONDITION:

Communication circuits between the power supply CM, gateway CM and collation CM are shorted to ground circuit.

TROUBLE SYMPTOM:

The keyless access function does not operate.

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK WIRING HARNESS.

1) Disconnect the collation CM, gateway CM, and power supply CM connectors.

2) Using a tester, check the continuity between the connectors and chassis ground.

Connector & terminal

(B420) No. 7 — Chassis ground:

(B420) No. 24 — Chassis ground:

(B419) No. 12 — Chassis ground:

Is there continuity?

Repair or replace the short circuit of the harness.

2.CHECK COLLATION CM.

1) Connect the collation CM connector.

2) Using a tester, check the continuity between the connectors and chassis ground.

Connector & terminal

(B420) No. 7 — Chassis ground:

(B419) No. 12 — Chassis ground:

Is there continuity?

Replace the collation CM.

3.CHECK POWER SUPPLY CM.

1) Disconnect the collation CM and power supply CM connectors.

2) Using a tester, check the continuity between the connectors and chassis ground.

Connector & terminal

(B421) No. 27 — Chassis ground:

(B419) No. 3 — Chassis ground:

Is there continuity?

Replace the power supply CM.

4.CHECK GATEWAY CM.

1) Disconnect the power supply CM and gateway CM connectors.

2) Using a tester, check the continuity between the connectors and chassis ground.

Connector & terminal

(B420) No. 24 — Chassis ground:

(B420) No. 26 — Chassis ground:

Is there continuity?

Replace the gateway CM.

5.CHECK DTC.

1) Connect all the connectors.

2) Using the Subaru Select Monitor, clear the memory.

3) Read the DTC again.

Is a DTC displayed?

Perform diagnosis according to the DTC.

System is normal.