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 MANUALSAUDI1998A4 AVANT QUATTRO, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALCOMPONENT LOCATIONSELECTRICAL COMPONENT LOCATORCONTROL UNITS
1998 Audi A4 Avant Quattro, Automatic
Control Units
1998 Audi A4 Avant Quattro, AutomaticSECTION Control Units
Control Units
| Component | Component Location |
|---|---|
| ABS/Electronic Differential Lock Control Module | Below left side of rear seat. See Figure. |
| Air Bag Control Module | In center console. See Figure. |
| Central Locking/Interior Light Delay/Anti-Theft Alarm Control Module | On bottom right of luggage compartment See Figure. |
| Cruise Control, Control Module | Behind right side of dash. See Figure. |
| Engine Control Module | In left rear corner of engine compartment. See Figure. |
| Heated Lock Cylinder Control Module | Upper part of left front door. See Figure. |
| Rear Light Control Module | On 13-pin relay carrier, positions No. 4 & No. 5. See Figure. |
| Transmission Control Module | Under carpet, forward of passenger's seat. See Figure. |
| Ultrasonic Interior Monitor Control Module | Below center of rear seat. See Figure. |
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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.