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Test Description

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. 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.

  1. 2. Listen for an audible click when the autolamp relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3. Verifies that the BCM is providing ground to the autolamp relay.
  3. 4. Test for a short to battery position voltage in the control circuit of the automatic autolamp relay.
Fig 1: DTC B2578
G01586984Courtesy of GENERAL MOTORS CORP.
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