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.
2000 Audi S4 StandardFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS
| Component | Component Location |
|---|---|
| ABS Control Module | In left front corner of engine compartment. |
| Air Bag Control Module | In center console. See Figure. |
| Antenna Selection Control Module | In trunk, on CD changer bracket. |
| 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. |
| Door Warning Lights Control Module | On 8-pin relay carrier, position 5. See Figure. |
| Fresh Air Blower Control Module | Behind right side of dash. |
| Headlight Leveling Control Module | Under right side of rear seat. |
| Heated Door Lock Control Module (Left) | Upper part of left front door. See Figure. |
| Motronic Engine Control Module (ECM) | Near brake booster, in protective case. See Figure. |
| Power Sunroof Control Module | At center of windshield header, above headliner. |
| Radiator Fan Control Module | In lower right front corner of engine compartment, on frame rail. |
| Rear Light Control Module | On 13-pin relay carrier, position No. 4 & No. 5. See Figure. |
| Throttle Valve Control Module (1.8L) | On left side of engine, on intake manifold. See Figure. |
| Throttle Valve Control Module (2.7L) | On front of engine, on intake manifold. See Figure. |
| Throttle Valve Control Module (2.8L) | On rear of engine, on intake manifold. See Figure. |
| Transmission Control Module (TCM) | Under carpet, forward of passenger's seat. See Figure. |
| Ultra-Sound Sensor Control Module | Below center of rear seat. See Figure. |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.