Component Tests and General Diagnostics

Checking the supply voltage/ground terminal

Checking the power supply and ground terminals

Power supply infotainment control module (ICM)
The infotainment control module (ICM) is powered via a power input on the control module.
When the ignition is on, the voltage input is supplied with power and the infotainment control module (ICM) can be activated using the POWER button.
1. The power input terminal #1 (#A1) is powered via a fuse from the central electronic module (CEM). The infotainment control module (ICM) will not be activated if there is an open-circuit.

Checking the power supply
Check the power supply cable from the battery to the central electronic module (CEM) and from the central electronic module (CEM) to infotainment control module (ICM) terminal #1 (#A1). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage when the ignition is on.

Ground terminal infotainment control module (ICM)
The control module has a ground input. The ground input from the control module is connected via a ground lead to the ground terminal in the car body. See the relevant wiring diagram for further information about the ground terminals in the bodywork.
1. Ground input terminal #3 (#A3) is power ground and is connected to the ground terminal in the car body.

Checking the ground terminal
Check the ground lead between control module terminal #3 (#A3) and the ground terminal. Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. With the ignition on, the drop in voltage between the ground connection for the control module and the ground terminal must not be greater than 0.5 V.
Remedy as necessary.

Other information
- Checking wiring and terminals Checking Wiring and Terminals
- Connecting the breakout box Connecting The Breakout Box, Infotainment Control Module (ICM)
- Signal specification Pinout Values and Diagnostic Parameters
- See the relevant wiring diagram for information about circuits and ground terminals in the bodywork.






Continue - DONE

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