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.
2009 Audi S4 AutomaticFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| ABS Control Module (W/EDL) | At left side of engine compartment. See Figure. |
| Airbag Control Module | Under front of center console. See Figure. |
| Antenna Module | In left side of luggage compartment lid. See Figure. |
| Central Control Module (Comfort System) | Below driver's seat. See Figure. |
| Convertible Top Control Module | Behind right quarterpanel trim. See Figure. |
| Coolant Fan Control (FC) Module | At radiator fan. See Figure. |
| Door Control Module (Driver Side) | Integrated in driver's door window regulator motor. See Figure. |
| Door Control Module (Passenger Side ) | Integrated in right front door window regulator motor. See Figure. |
| Entry Assistance Control Module | Under left side of driver's seat. See Figure. |
| Fresh Air Blower Control Module | Integral to fresh air blower motor. See Figure. |
| Garage Door Opener Control Module | Behind right side front bumper cover. See Figure. |
| Headlight Range Control Module | Behind glove box. See Figure. |
| Heated Windshield Control Module | In right side of plenum chamber, under battery tray. See Figure. |
| Memory Seat Control Module | Under front of driver's seat. See Figure. |
| Motronic Engine Control Module (ECM) | In E-box, in plenum chamber. See Figure. |
| Navigation Control Module W/CD | Left side of luggage compartment. See Figure. |
| Operating Electronics & Telephone Control Module | Under front passenger's seat. See Figure. |
| Parking Aid Control Module | Left rear of luggage compartment. See Figure. |
| Throttle Valve Control Module (4) | On throttle body. See Figure. |
| Trailer Towing Control Module | Left side of luggage compartment. See Figure. |
| Transmission Control Module (TCM) (Multitronic) | On rear of transmission. See Figure. |
| Vehicle Electrical System Control Module | Behind driver's storage compartment. See Figure. |
Factory Service Tools
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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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