Test Description

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

2) - Listen for an audible click when the inadvertent power relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3) - Tests for voltage at the coil side of the inadvertent power relay. The CTSY fuse supplies power to the coil side of the inadvertent power relay.
4) - Verifies that the body control module is providing ground to the inadvertent power relay.
5) - Tests if a ground is constantly applied to the inadvertent power relay.
6) - Since this is a general circuit malfunction code, it is necessary to test for both a short to voltage as well as an open on this circuit.

Fig 1: DTC B1480 Diagnosis (Steps 1-3)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B1480 Diagnosis (Steps 4-13)

Courtesy of GENERAL MOTORS CORP.