SAAB WIS ONLINE

Brief description, electrically heated rear window and door mirrors

Brief description, electrically heated rear window and door mirrors

In the rear window glass there are a number heating conductors on the inside of the glass. The heating conductors are also used as the Audio system antenna.

The glass in the door mirrors also has heating conductors.

On cars with MCC, the heating is turned on and off manually with a switch on the MCC panel which controls the relay via DICE.

On cars with ACC, the heating is turned on and off automatically by the ACC control module or manually by a switch on the ACC panel. The ACC control module outputs a signal to the bus for DICE, which controls the heating relay.

Normally, the electrical heating is on for 12 minutes.

P bus and I bus

In the Saab 9-5, all the car's control modules are connected to buses with the exception of the ABS and SRS control modules.

The buses consist of a P bus (Powertrain Bus) and an I bus (Instrument Bus). Both buses are connected to the MIU (Main Instrument Unit). The buses are electrically isolated from each other.

The P-bus has a data transfer rate ten times higher than that of the I-bus.

All information sent out on a bus by a control module is available to all other control modules connected to the bus. The MIU ensures that the information that is available on one bus is also available on the other.