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Subaru Crosstrek Service Manual: Dtc b1242 wireless tuner

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

DTC B1242 WIRELESS TUNER

DTC detecting condition:

When short circuit occurs in harness between keyless access CM and receiver.

Trouble symptom:

The keyless access with push button start function (except for emergency function) does not operate properly.

Operation by the access key button does not function.

CAUTION:

For replacement procedure of keyless access CM, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

When the harness comes close to the receiver, the performance of keyless access system operation and wireless operation may reduce. So, when replacing or inspecting the receiver and harness, do not change the route and length of the surrounding harnesses.

Wiring diagram:

Push button start system Push Button Start System > WIRING DIAGRAM">

STEPCHECKYESNO

1.CHECK LAN SYSTEM.

Inspect LAN system. Basic Diagnostic Procedure > PROCEDURE">

Is LAN system normal?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1242 WIRELESS TUNER">Go to Step 2.

Perform the inspection according to the diagnosis for LAN system.

2.CHECK HARNESS.

1) Disconnect the keyless access CM connector.

2) Disconnect the receiver connector.

3) Using the tester, measure the resistance between terminals of keyless access CM connector and receiver connector, and keyless access CM and chassis ground.

Connector & terminal

(B573) No. 19 — (R296) No. 2:
(B573) No. 17 — (R296) No. 5:
(B573) No. 5 — (R296) No. 4:
(R296) No. 1 — Chassis ground:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1242 WIRELESS TUNER">Go to Step 3.

Repair or replace the open circuit of harness.

3.CHECK HARNESS.

Using a tester, measure the resistance between the keyless access CM connector and chassis ground.

Connector & terminal

(B573) No. 19 — Chassis ground:
(B573) No. 17 — Chassis ground:
(B573) No. 5 — Chassis ground:

Is the resistance 10 k? or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1242 WIRELESS TUNER">Go to Step 4.

Repair or replace the short circuit of the harness.

4.CHECK RECEIVER.

1) Replace the receiver, and then connect it. Receiver">

2) Using the Subaru Select Monitor, clear the memory. Clear Memory Mode">

3) Read the DTC using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">

Is DTC B1242 displayed?

Replace the keyless access CM. Keyless Access CM">

Receiver has a malfunction.

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