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.
Distributed function of the power window regulators
The power window regulator function is implemented by a number of control modules. The footwell module actuates the front power windows. The rear power windows, if fitted, are activated through the junction box electronics.
The graphic shows the E70
| Index | Description |
|---|---|
| 1 | Power-window motor, driver's side at front |
| 2 | Footwell module (FRM) |
| 3 | Power windows motor, passenger's side at front |
| 4 | Power windows switch, passenger's side at front |
| 5 | Car Access System (CAS) |
| 6 | Hall sensor for power window, passenger's side at rear |
| 7 | Power windows motor, passenger's side at rear |
| 8 | Rear passenger's side power windows switch |
| 9 | Junction box with junction box electronics (JBE) |
| 10 | Rear driver's side power windows switch |
| 11 | Power windows motor, driver's side at rear |
| 12 | Hall sensor for power window, driver's side at rear |
| 13 | Switch block, driver's door |
The control modules involved communicate via the data buses in the vehicle. The junction box supplies the control modules with voltage.
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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.