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.
Schematic System Circuit Diagram - Interior Lighting
The system circuit diagram follows the description below and provides an overview of the full extent of all possible interior lighting options.
The status of the door contact (Hall sensor) in the lock (38) changes, for example, when the door is opened with the vehicle unlocked. The footwell module (1) evaluates the status and sends the request to switch on the interior lighting.
At the same time, the doorway light (13) for the door that is open and the footwell lights (2, 3, 46, 48) are switched on by the footwell module. The status of the door contact changes again when the vehicle door is closed. The footwell module initiates the procedure to switch off the interior lighting. If the tailgate is opened, the status of the tailgate switch (21) registered by the tailgate central locking module changes. The luggage compartment lighting (24, 53) is connected to the power supply via Terminal 30B so that the luggage compartment lights are switched on via the tailgate switch.
| Index | Explanation |
|---|---|
| 1 | Footwell module FRM |
| 2 | Footwell light, driver's side |
| 3 | Footwell light, front passenger's side |
| 4 | Glove compartment switch |
| 5 | Glove compartment light |
| 6 | Junction box module JB |
| 7 | Door switch, passenger side, front |
| 8 | Exterior door handle light, passenger side, front |
| 9 | Courtesy light, passenger side, front |
| 10 | Interior door handle light, passenger side, front |
| 11 | Door pocket light, passenger side, front |
| 12 | Sill light, passenger side, front |
| 13 | Doorway light, passenger side, front |
| 14 | Door switch, passenger side, rear |
| 15 | Exterior door handle light, passenger side, rear |
| 16 | Courtesy light, passenger side, rear |
| 17 | Interior door handle light, passenger side, rear |
| 18 | Door pocket light, passenger side, rear |
| 19 | Doorway light, passenger side, rear |
| 20 | Sill light, passenger side, rear |
| 21 | Tailgate switch |
| 22 | Tailgate lock motor |
| 23 | Tailgate lock barrel |
| 24 | Luggage compartment light in tailgate |
| 25 | Doorway light, driver's side, rear |
| 26 | Door pocket light, driver's side, rear |
| 27 | Sill light, driver's side, rear |
| 28 | Interior door handle light, driver's side, rear |
| 29 | Courtesy light, driver's side, rear |
| 30 | Exterior door handle light, driver's side, rear |
| 31 | Door switch, driver's side, rear |
| 32 | Doorway light, driver's side, front |
| 33 | Door pocket light, driver's side, front |
| 34 | Door pocket light, driver's side, front |
| 35 | Interior door handle light, driver's side, front |
| 36 | Courtesy light, driver's side, front |
| 37 | Exterior door handle light, driver's side, front |
| 38 | Door switch, driver's side, front |
| 39 | Vanity mirror light switch, driver's side, front |
| 40 | Vanity mirror light, driver's side, front |
| 41 | Center console stow compartment light, front |
| 42 | Vanity mirror light, passenger side, front |
| 43 | Vanity mirror light switch, passenger side, front |
| 44 | Map pocket light, front passenger seat backrest |
| 45 | Vanity mirror light with switch, passenger side, rear |
| 46 | Footwell light, rear right |
| 47 | Rear center armrest stow compartment light |
| 48 | Footwell light, rear left |
| 49 | Vanity mirror light with switch, driver's side, rear |
| 50 | Map pocket light, driver's seat backrest |
| 51 | Interior/reading light unit, front |
| 52 | Interior/reading light unit, rear |
| 53 | Rear center armrest stow compartment light |
| 54 | Front power distribution box |
| 55 | Luggage compartment power distribution box |
| KI. 30 | Terminal 30 |
| KI. 30B | Terminal 30 basic mode |
| KI. 58g | Terminal 58g |
| IB | Interior lighting control |
K-CAN2 signals at footwell module
| In/Out | Information | Source/sink | Function |
|---|---|---|---|
| In | Status, central locking | Car Access System > footwell module | Interior lighting ON |
| In | Status, central locking | Car Access System > footwell module | Interior lighting OFF |
| In | Crash signal | Crash sensor > advanced crash safety management | Interior lighting ON |
| Out | Electrical load cutout | Footwell module > Junction box module | Interior lighting OFF through electrical load cutout |
| Out | Status, terminal 58g | Light switch > footwell module | Instrument lighting ON (e.g. control buttons, instrument cluster, gear selector lever) |
| Out | Status, door switch | Footwell module > Car Access System | Condition for activation of central locking (enabling/allowing) |
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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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