Component Tests and General Diagnostics

Checking the voltage / ground terminal

Checking the power supply and ground terminals

Voltage supply, driver information module (DIM)
The driver information module (DIM) is powered via a power input on the driver information module (DIM).
Power input terminal #A3 is powered via a fuse from the central electronic module (CEM). The driver information module (DIM) 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 driver information module (DIM) terminal #A3. 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, driver information module (DIM)
The driver information module (DIM) 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.
- Ground input terminal #A4 is signal ground and is connected to the ground terminal in the car body.

Checking the ground terminal
Check the ground lead between control module terminal #A4 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, Driver Information Module (DIM)
- Signal specification Signal Specification, Driver Information Module (DIM)
- See the relevant wiring diagram for information about circuit and ground terminals in the bodywork.

Continue - DONE

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