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
2008 Pontiac Grand Prix BaseSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
- Turn OFF the ignition. Turn the I/P module disable switch to the ON position. Connect the scan tool. Turn ON the ignition, with the engine OFF. The I/P module disable switch ON indicator should illuminate. Scan tool should display ENABLED.
- If the indicator does not illuminate, test the I/P module disable switch power and ground circuits for proper operation. If any of the above conditions are found, make appropriate repair.
- Replace the I/P module disable switch. Refer toRepair Instructions .
- Turn the I/P module disable switch on and off and verify that the active switch data parameter toggles between Enabled/Disabled.
- Test the I/P module disable signal and suppression indicator control circuits for a short to voltage, short to ground or open/high resistance. If any of the above conditions are found, make the appropriate repair.
- Replace I/P module disable switch. Refer to Repair Instructions .
- Reconnect all components, with ignition ON use the scan tool to clear DTC. Recheck for DTC. If DTC B0090 resets, replace the SDM. Refer to Repair Instructions .
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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.