Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. 3
   
   Tests the operation of the headlamp washer pump relay and circuits. If the test lamp illuminates for a few seconds the washer pump is faulty.
2. 4
   
   Tests the battery positive voltage supply circuit to the headlamp washer pump relay.
3. 5
   
   Tests the washer pump control circuit to the headlamp washer pump relay.
4. 6
   
   Tests the front park lamp voltage supply circuit to the headlamp washer pump relay.
Fig 1: Washers Inoperative Diagnostic Table - Headlamp (Steps 1-10)
Courtesy of GENERAL MOTORS CORP.
Fig 2: Washers Inoperative Diagnostic Table - Headlamp (Steps 11-18)
Courtesy of GENERAL MOTORS CORP.