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.
Electrical interfaces
The control unit has a 54-pin plug via which the power supply, sensors, actuators and bus systems are connected.
As is the case with the controller housing, the plug does not have a watertight design. This is not necessary as it is installed on the inside of the vehicle.
The ICM control unit is connected to the integrated FlexRay controller via the FlexRay bus system. A detailed description of the new features of the FlexRay network is provided in the Product Information for the F01/F02 bus systems. The communication with most partner control units is handled by the microprocessors in the ICM via the FlexRay.
The FlexRay is routed to the ICM control unit (from the central gateway module) and continues from there (to the DME). The ICM control unit is related to the FlexRay, i. e. not an end node. This is why it does not have a terminating resistor for the FlexRay.
A further bus system, a local CAN , is connected to the ICM control unit in addition to the FlexRay. Its sole purpose is to enable the ICM to communicate with the long-range radar sensor and the short-range radar sensors. This local CAN therefore performs the same tasks as the sensor CAN in the E6x LCI that connects the LDM control unit to the sensors. It transmits information on road users that has been recorded by the sensors.
The local CAN operates in the same way as the PT-CAN with a data transfer rate of 500 kBit/s. There are two terminating resistors for the local CAN, each with 120.. One of these is in the ICM control unit, the second terminating resistor is integrated in the long-range radar sensor. The local CAN is routed to the short-range radar sensors by short stub lines.
The pins for the local CAN are only connected at the plug of the ICM control unit if it is a high-end version.
The ICM control unit is also connected to the wake-up line. The ICM control unit can be woken up via the wake-up line.
Power is supplied from the front fuse carrier by terminal 30B.
| Index | Explanation |
|---|---|
| 1 | Central gateway module |
| 2 | Dynamic Stability Control |
| 3 | Short-range radar (SRR) sensor, left |
| 4 | Long-range radar sensor (LRR) |
| 5 | Short-range radar sensor (SRR), right |
| 6 | DME control unit |
| 7 | ICM control unit |
| 8 | FlexRay routing and continuation without terminating resistor |
| 9 | Routing of FlexRay with terminating resistor |
| 10 | Routing of local CAN without terminating resistor |
| 11 | Routing of local CAN with terminating resistor |
| W | ICM control unit can be woken up |
| WUP | Wake-up line |
NO RELATED
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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.