GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1999 🢒 Grand Prix 🢒 Body and Accessories 🢒 Seats 🢒 Heated Seats System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

Set the driver seat heater switch to the LO position.
    • The seat temperature rises to approximately 37.5°C (98.5°F).
    • The LO indicator lights.
    • The HI temperature indicator is inoperative - Replace the driver seat heater switch. Refer to Diagnostic System Check - Driver Information Systems .
    • The heated seat switch does not light. Refer to Interior Lamps System Check .

2

Set the driver seat heater switch to the HI position.
    • The seat temperature rises to approximately 42.5°C (107.5°F).
    • The HI indicator lamp lights.
    • The LO temperature indicator is inoperative - Replace the driver seat heater switch. Refer to Diagnostic System Check - Driver Information Systems .
    • The heated seat switch does not light. Refer to Interior Lamps System Check .

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.