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.
Automatic Luggage Compartment Lid Actuating System Circuit Diagram
| Index | Explanation |
|---|---|
| 1 | Central gateway module (ZGM) |
| 2 | Footwell module (FRM) |
| 3 | Luggage compartment lid button, A-pillar |
| 4 | Car Access System (CAS) |
| 5 | Junction box electronics (JB) |
| 6 | Rear power distribution box |
| 7 | Spindle drive motor, right |
| 8 | Luggage compartment lid lift (HKL) |
| 9 | Inner luggage compartment lid button/central double-lock button |
| 10 | Outer luggage compartment lid button |
| 11 | Luggage compartment lid lock with luggage compartment lid switch/lock barrel |
| 12 | Automatic soft-close luggage compartment lid |
| 13 | Spindle drive motor, left |
| 14 | Luggage compartment lighting, underside of rear window shelf |
| 15 | Remote control receiver in diversity module |
| K-CAN | Body CAN |
| K-CAN2 | Body-CAN2 |
| KI. 30 | Terminal 30 |
| KI. 30B | Terminal 30, basic operation |
| LIN-Bus | Local Interconnect Network bus |
K-CAN signals at the luggage compartment lid lift
| In/out | Information | Source/sink | Function |
|---|---|---|---|
| In | Outside temperature | Outside temperature sensor > instrument cluster | Value for calculating overheating protection for the spindle motors |
| In | Driving speed | Wheel speed sensors > Dynamic stability control > Integrated chassis management | Permit/deny control functions of the luggage compartment lid |
The radio signal from the identification transmitter is received by the rear window antenna. The remote control receiver in diversity module (15) forwards the signal to Car Access System (4). The Car Access System is the master control unit for the central locking function.
Once the signal has been successfully verified, the Car Access System issues a command to control the central locking in the luggage compartment lid.
The junction box electronics (5) execute the command to control the central locking in the luggage compartment lid. The junction box electronics register the status of the luggage compartment lid switch (11) for the "automatic luggage compartment lid actuation" function. The status of the luggage compartment lid switch is sent on the K-CAN to the luggage compartment lid lift (8). The status is one of the triggering criteria for luggage compartment lid operation.
Sensors (13 and 7) in the spindle drives monitor the movement of the luggage compartment lid. The luggage compartment lid lift is therefore able to reverse the closing movement of an obstructed luggage compartment lid, allowing the obstruction to be freed.
An obstruction to luggage compartment lid movement during the opening procedure causes the luggage compartment lid to stop and it is not reversed.
As a backup to the Hall sensors, the luggage compartment lid lift monitors the power consumption of the spindle drive. An increase in current when the luggage compartment lid blocks causes the luggage compartment lid to stop and, if need be, reverse.
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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.