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.
System Circuit Diagram - Power Windows: Notes
| Index | Explanation |
|---|---|
| 1 | Footwell module (FRM) |
| 2 | Car Access System 4 (CAS 4) |
| 3 | Junction box electronics (JB) |
| 4 | Front power distribution box |
| 5 | Power window motor with indirect pressure-sensitive finger guard on front passenger's side |
| 6 | Power window switch, passenger side front |
| 7 | Power window motor with indirect pressure-sensitive finger guard on rear passenger's side |
| 8 | Power window switch, passenger side rear |
| 9 | Rear power distribution box |
| 10 | Remote control receiver in diversity module |
| 11 | Power window switch, driver's side rear |
| 12 | Power window motor with indirect pressure-sensitive finger guard on rear driver's side |
| 13 | Driver's door switch cluster |
| 14 | Power window with indirect pressure-sensitive finger guard on driver's door |
| K-CAN2 | Body-CAN2 |
| LIN-Bus | Local Interconnect Network bus |
| KI. 30 | Terminal 30 |
| KI. 30F | Terminal 30, fault switched |
The Car Access System (2) issues the enable to actuate the power window motors (5, 7, 12 and 14). If a power window switch is then activated, the footwell module (1) (front power window motor) or the junction box electronics (3) (rear power window motor) executes the request.
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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.