Control Module
The most important role of the Driver Information Module is to display the status of the systems in the car for the driver. This covers functions such as:
- Vehicle speed
- Engine speed
- Fuel level
- Engine coolant temperature (ECT)
- Various warning signals.
The control module is integrated in the combined instrument panel. When replacing the driver information module, the entire combined instrument panel must also be replaced.
The driver information module mostly communicates with other control modules and components via CAN communication. However some functions are connected directly.
The control module checks input and output signals through an integrated diagnostic system. A diagnostic trouble code (DTC) is stored if the control module detects an error. In certain cases the driver information module replaces the faulty signal with a substitute signal.
Diagnostic trouble codes (DTC) are stored in the control module memory. The data can be read off using the diagnostic tool.
An easy way of checking that the driver information module is both powered and grounded is to check whether the following warning lamps light when the ignition is switched on: Parking brake, Malfunction indicator lamp and Brake fluid level.