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.
Location of components
The central locking function uses the following components (may differ depending on model, model year, options and market):
| Position | Component | Position | Component |
| 3/73 | Power child lock switch | 4/56 | Central electronic module |
| 3/74-3/77 | Switches in door locks | 4/58 | Rear electronic module |
| 3/78 | Switch in trunk lock | 4/70 | Upper electronic module |
| 3/111 | Light switch module | 5/1 | Driver information module |
| 3/112 | Climate control module | 6/37 | Lock motor for the fuel tank filler cover |
| 3/126, 3/127 | Drivers door module / Passenger door module | 10/13, 10/14 | Turn signal lamp, front |
| 3/173 | Valet lock switch | 10/15, 10/16 | Turn signal lamp, front fender |
| 3/174 | Switch for reduced alarm. | 10/54, 10/47 | Turn signal lamp, rear |
| 4/9 | SRS (supplemental restraint system) control module | Key and lock cylinder | |
| 4/16 | The brake control module,2002-/ ABS-control module, 1999-2001. | Remote control |
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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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