Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit/System Testing: Notes
2008 Pontiac Grand Prix BaseSECTION Notes
WARNING: This page is about a different car, the 2008 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
Windshield Washer Solvent Heater Malfunction
- Ignition OFF, disconnect the X1 harness connector at the windshield washer solvent heater assembly.
- Verify that a test illuminates between the washer solvent heater assembly ground circuit terminal 2 and battery voltage.
- If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
- Ignition ON, verify that a test lamp illuminates between the battery positive voltage circuit terminal 1 and ground.
- If the test lamp does not illuminate, test the battery positive voltage circuit for a short to ground or an open/high resistance.
- Ignition OFF, disconnect the X2 harness connector at the windshield washer solvent heater assembly.
- Engine running, verify that a test lamp illuminates between the ignition 3 voltage circuit terminal 6 and ground.
- If the test lamp does not illuminate, test the ignition 3 voltage circuit for a short to ground or an open/high resistance.
- Verify that a test illuminates between the washer solvent heater assembly ground circuit terminal 4 and battery voltage.
- If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
- Verify that a test lamp does not illuminate between the washer fluid heated control switch signal circuit terminal 1 and battery voltage.
- If the test lamp is illuminated, test the signal circuit for a short to ground. If the circuit tests normal, test or replace the heated washer fluid switch.
- With a test lamp connected between the washer fluid heated control switch signal circuit terminal 1 and battery voltage, press the heated washer fluid switch and verify that the test lamp illuminates.
- If the test lamp does not illuminate, test the switch signal and ground circuits for a short to voltage or an open/high resistance. If the circuit test normal, test or replace the heated washer fluid switch.
- If all circuits test normal, test or replace the windshield washer solvent heater assembly.
Windshield Heated Washer Fluid Indicator Inoperative
- Ignition OFF, disconnect the X2 harness connector at the windshield washer solvent heater assembly.
- Ignition ON, install a 3-amp fused jumper wire between the washer fluid heated control switch LED control circuit terminal 2 and ground. Verify the heated washer switch indicator is illuminated.
- If the indicator is not illuminated, test the control circuit for an open/high resistance. If the circuit tests normal, replace the accessory switch assembly.
- If all circuits test normal, replace the windshield washer solvent heater assembly.
Windshield Heated Washer Fluid Indicator Always On
- Ignition OFF, disconnect the X2 harness connector at the windshield washer solvent heater assembly.
- Ignition ON, the heated washer switch indicator should not be illuminated.
- If illuminated, test the washer fluid heated control switch LED control circuit for a short to voltage. If the circuit tests normal, replace the accessory switch assembly.
- If all circuits test normal, replace the windshield washer solvent heater assembly.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.