Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue. 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 RAP relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. Tests for voltage at the coil side of the RAP Relay. The INADV POWER BUS fuse supplies power to the coil side of the RAP relay.
4. This step verifies that the body control module (BCM) is providing ground to the RAP relay.
5. This step tests if ground is constantly being applied to the RAP relay.

Fig 1: DTC B1478 Diagnostic Table (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B1478 Diagnostic Table (2 Of 2)

Courtesy of GENERAL MOTORS CORP.