Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. 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. The normal state of the switch is the state of the switch input before activation. The terminology used by the scan tool is OFF.
3. Tests for the proper operation of the switch in the normally open position.
4. Tests for the proper operation of the switch in the closed position.
8. Tests the 5 volt reference signal circuit for an open or a short to ground.

Fig 1: DTC B3593 (Steps 1-10)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B3593 (Steps 11-15)

Courtesy of GENERAL MOTORS CORP.