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 door unlock relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. Verifies that the body control module (BCM) is providing voltage to the door unlock relay.
4. Tests for an open in the ground circuit to the door unlock relay.
5. Tests if voltage is constantly being applied to the door unlock relay.
12. After replacement of the BCM you must calibrate the new module for proper operation.

Fig 1: DTC B3147 or B3148 Diagnostic Table (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B3147 or B3148 Diagnostic Table (2 Of 2)

Courtesy of GENERAL MOTORS CORP.