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.
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HOMESERVICE MANUALSAUDI2004A6 QUATTRO, 2.7 D, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSRADIO, TELEPHONE, NAVIGATION, TRIP COMPUTERTELEMATICSTELEMATICS SYSTEM, TROUBLESHOOTING USING ONSTAR® SYSTEM STATUS LIGHTCONDITION - SYSTEM STATUS LIGHT "GREEN" PLUS
2004 Audi A6 Quattro, 2.7 D, Standard
Condition - system status light "green" plus
2004 Audi A6 Quattro, 2.7 D, StandardSECTION Condition - system status light "green" plus
- message "unable to contact OnStar®" and disconnect,
- message "OnStar® request ended",
- nothing happens,
- or a cellular message
indicates system cellular reception is affected. Proceed as follows:
- Relocate vehicle to a more elevated or open area and repeat connection attempts. Depending on the local cellular/GPS traffic conditions, several connection attempts may be necessary (and are normal).
- Shortcomings in the vehicle's cellular/GPS antenna system also affects connectivity. Check all cellular/GPS antenna connections, and perform OBD program. See TELEMATICS ON BOARD DIAGNOSTIC (OBD), INITIATING . Check for DTCs related to antenna function.
- If you are still unable to connect, record the VIN and customer details and call OnStar® Customer Care at 1-888-390-4050. Identify yourself to the advisor as an Audi Technician. The advisor will verifiy the customer's OnStar® account is active. Further troubleshooting assistance may be given.
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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.