Test Description

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 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 Diagnosis (Steps 1-10)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B3593 Diagnosis (Steps 11-15)

Courtesy of GENERAL MOTORS CORP.