Checking The Power Supply And Ground Terminals
Power supply
The driver information module (DIM) is powered via a power input on the control module.
Power input terminal #A3 is powered 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 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 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.
- 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: