Test Description

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

A DMM must be used in this step. A test lamp may give incorrect results. Testing for B+ supply from the BCM.
An illuminated test lamp at step 16 reveals a short to voltage in the serial data circuit.

Fig 1: Keyless Entry System Inoperative (1 Of 3)
Courtesy of GENERAL MOTORS CORP.

Fig 2: Keyless Entry System Inoperative (2 Of 3)
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Fig 3: Keyless Entry System Inoperative (3 Of 3)
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Fig 4: Door Unlock Function Inoperative With Transmitter
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Fig 5: Door Lock Function Inoperative With Transmitter
Courtesy of GENERAL MOTORS CORP.