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
- Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the C3 telematics communication interface control module battery. It may take up to 2 minutes for all vehicle systems to power down.
- Test for greater than 9.5 V between the B+ voltage circuit terminal A and low reference terminal B.
- If less than 9.5 V
Replace the C3 telematics communication interface control module battery.
- If greater than 9.5 V
- If less than 9.5 V
- Replace the K73 telematics communication interface control module.
The following procedure features a component test of the C3 telematics communication interface control module battery. It measures the voltage level of the C3 telematics communication interface control module battery. Do not disconnect or connect the C3 telematics communication interface control module battery with the ignition in any other position other than OFF, otherwise there is a risk of blowing an internal fuse to the C3 telematics communication interface control module battery rendering it inoperable.
Use the Manual With the Right Hardware
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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.
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