Test Description

The numbers below refer to the step numbers on the diagnostic table. See Fig 1 and Fig 2 .

1. 2
   
   Listen for an audible click when the inadvertent power relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
2. 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.
3. 4
   
   Verifies that the body control module is providing ground to the inadvertent power relay.
4. 5
   
   Tests if a ground is constantly applied to the inadvertent power relay.
5. 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 Diagnostic Table (Steps 1-4)
Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC B1480 Diagnostic Table (Steps 5-13)
Courtesy of GENERAL MOTORS CORP.