System Overview

System overview

Control module




The most important role of the driver information module (DIM) is to display the status of the vehicle systems for the driver. This covers functions such as:
- the vehicle speed
- engine speed
- fuel level
- various warning signals.
The control module is integrated in the combined instrument panel. If the control module is replaced, the combined instrument panel must also be replaced.
The driver information module (DIM)communicates with other control modules and components via CAN communication.
The control module checks the 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 control module replaces the faulty signal with a substitute value.
Any diagnostic trouble codes 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 (DIM) is both powered and grounded is to check whether the following warning lamps come on when the ignition is switched on:
- parking brake
- Malfunction indicator lamp (MIL).
- brake fluid level.
For further information, also see signal specifications.

Signals
The following table summarizes input and output signals to and from the driver information module (DIM). The signal types are divided into directly connected signals and Controller area network (CAN) communication. The illustration below displays the same information with the Volvo component designations.