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.
2004 Audi TT Base, 2D ConvertibleFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| ABS Control Module | At left rear corner of engine compartment. |
| Air Bag Control Module | Beneath center of dash, near accelerator pedal. |
| All-Wheel Drive Control Module | On haldex coupling, on rear differential. |
| Central Locking Control Module | Forward of left rear fenderwell, behind panel. See Figure . |
| Coolant Fan Control Control Module | At left front corner of engine compartment. |
| Fresh Air Blower Control Module | Behind right end of dash, on HVAC housing. |
| Headlight Beam Adjusting Control Module (Coupe) | Beneath left side of rear seat. |
| Headlight Beam Adjusting Control Module (Roadster) | Behind rear trim panel, in luggage compartment. |
| Heated Door Lock Control Module (Left) | In left door. |
| High Intensity Gas Discharge Lamp Control Module (Left/Right) | Below respective headlight, on frame rail. |
| Lamp Control Module (2) | On 13-fold relay panel. See Figure . |
| Mirror Fold-Away Function Control Module | On 13-fold relay panel. See Figure . |
| Motronic Engine Control Module | In center of plenum, between firewall & windshield base. See Figure . |
| Navigation Unit (W/CD Drive) | Behind right seat, behind storage cover. |
| Operating Electronics & Telephone Control Module (Coupe) | Below left rear seat. |
| Operating Electronics & Telephone Control Module (Roadster) | Behind subwoofer, on rear compartment wall. |
| Power Window Control Module (Left/Right) | In respective door, integral with power window motor unit. |
| Radar Interior Monitoring Control Module 1 (Roadster) | Behind passenger seat wind deflector. |
| Throttle Valve Control Module (1.8L AMU) | On throttle body, on left rear of engine. |
| Throttle Valve Control Module (1.8L ATC/AWP) | On throttle body, on left front of engine. 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.