For 1990-2009 cars

The OnStar CIM monitors the cellular phone antenna coax for proper status. If the status indicates a problem with the antenna coax the input will be ignored. DTC B2470 will fail and become current until the test is passed and the condition is no longer present.

### DTC Parameters

• | The CIM must be on.

• | Malfunction on the cellular antenna circuit.

• | This test runs every 10 seconds.

• | Illuminate the red OnStar telltale.

### Diagnostics Aids

Check the connections at the CIM and the Cellular Antenna. Also check the alignment of the cellular antenna couplers on the window for proper alignment.