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
- Ignition OFF, disconnect the coax harness connectors at the VCIM and the GPS antenna.
- Test for less than 5 ohms of resistance between the two ends of the coax cable center conductor.
- If greater than the specified range, replace the GPS antenna coax cable.
- Test for less than 5 ohms of resistance between the two ends of the coax cable outer shield.
- If greater than the specified range, replace the GPS antenna coax cable.
- Test for infinite resistance between the coax center conductor and the outer shield.
- If less than the specified range, replace the GPS antenna coax cable.
- Connect the coax harness connector at the VCIM.
- Ignition ON, test for 4.0- 5.5 volts between the coax center conductor and the outer shield.
- If not within the specified range, replace the VCIM.
- If all circuits test normal, replace the GPS antenna.
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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.