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

DTC B2001 CAN-LS BD_WAKE CAN-LS DISCREPANCY

DTC DETECTING CONDITION:

There was incompatibility between the body integrated unit and the gateway CM communication circuits, and the low-speed CAN data.

TROUBLE SYMPTOM:

The keyless access function may not be operable.

STEPCHECKYESNO

1.CHECK DTC.

Read gateway CM DTCs using the Subaru Select Monitor.

Is B2001 past malfunction?

Check the harness for an open or short circuit, and check the connection of the connectors.

2.CHECK WIRING HARNESS.

1) Disconnect the body integrated unit and gateway CM connectors.

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

Connector & terminal

(B419) No. 15 — Chassis ground:

(B419) No. 19 — Chassis ground:

Is there continuity?

Repair or replace the short circuit of the harness.

3.CHECK GATEWAY CM.

1) Connect the disconnected connectors.

2) Turn the ignition to ACC or ON.

3) Disconnect the body integrated unit connector, and measure the voltage between body integrated unit connector and chassis ground.

Connector & terminal

(B281) No. 14 (+) — Chassis ground (−):

Is the voltage 4 V or more?

Replace the gateway CM.

4.CHECK BODY INTEGRATED UNIT.

1) Connect the disconnected connectors.

2) Position the access key where the vehicle transmission waves will not reach it and close all the doors.

3) Wait for one minute or more until the vehicle enters sleep status.

4) While in sleep status, measure the voltage between the gateway CM connector and chassis ground.

Connector & terminal

(B419) No. 15 (+) — Chassis ground (−):

Is the voltage 4 V or more?

Replace the body integrated unit.

5.CHECK DTC.

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

2) Turn the ignition to ACC or ON, and then to OFF.

3) Close all doors, and wait for one minute or more until the vehicle enters sleep status. (Maintain in sleep status for approx. 30 seconds.)

4) Turn the ignition to ACC or ON, and read the DTC of the gateway CM using the Subaru Select Monitor.

Is B2001 detected?

Replace the gateway CM.

System is normal.