Component Tests and General Diagnostics

Checking the supply voltage/ground terminal

Power supply
The driver information module (DIM) is powered via a power input on the control module.
1. Power input terminal #C1:3 is supplied with voltage via a fuse from the central electronic module (CEM). It will not be possible to activate the control module if there is an open-circuit.

Checking the power supply
Check the power supply cable from Central electronic module (CEM) terminal #C3:69 to Driver information module (DIM) terminal #C1:3. 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.

Ground terminal, driver information module (DIM)
The Driver information module (DIM) has a ground input. The ground input from the control module is power ground and is connected to the ground terminal in the car body. See the relevant wiring diagram for further information about the ground terminal.
1. Ground input 1, #C1:1 is a power ground and is connected to the ground terminal in the body.

Checking the ground terminal
Check the ground cable between the Driver information module (DIM) terminal #C1:1 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 Driver information module (DIM) and the chassis connection must not be greater than 0.5 V. Remedy as necessary.
Remedy as necessary.

Other information
- 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 circuits and ground terminals in the bodywork.
- Checking wiring and terminals Checking Wiring and Terminals

-------------------------------------------------