Diagnostic Aids

WARNING: This page is about a different car, the 1988 Buick Riviera and 1988 Buick Reatta. However, it is still accessible from the selected car via links, so may be relevant.

Any electrical condition that interrupts normal operation of pump/motor relay or pump/motor power circuits can cause an inoperative pump/motor, including a short to ground on circuit No. 864. A failed pressure switch that is not providing a path to ground will also cause an inoperative pump/motor.

Fig 1: Pump/Motor Does Not Operate Schematic

Fig 2: Flow Chart D1, Pump/Motor Does Not Operate

Fig 3: Flow Chart D1, Pump/Motor Does Not Operate (1 of 2)

Fig 4: Flow Chart D1, Pump/Motor Does Not Operate (2 of 2)