Component Tests and General Diagnostics

Checking the voltage/ground terminal

Checking the power supply and ground terminals

Voltage reading infotainment control module (ICM)
The infotainment control module (ICM) is supplied with power via a power supply 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. Power input terminal #1 (#A1) is supplied with power via a relay on the central electronic module (CEM). The relay is powered via a fuse from the battery. The relay coil can be diagnosed by 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 relay on the central electronic module (CEM) and from the relay for the infotainment control module (ICM) terminal #1 (#A1). Check for an open-circuit. Check for loose connections. Check for contact resistance and 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 #10 (#A10) is power ground and is connected to the ground terminal in the car body.

Checking ground terminal
Check the ground lead between control module terminal #10 (#A10) and the ground terminal. Check for an open-circuit. Check for loose connections. Check for contact resistance and 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
- To connect the breakout box, see Connecting the breakout box Pinout Values and Diagnostic Parameters
- For information about signals, see Signal specification Signal Specification, Infotainment Control Module (ICM)
- See the relevant wiring diagram for information about circuit and ground terminals in the bodywork.





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