Alarm Module: Description and Operation

BCM Body Control Module (707)







Main task
The primary task of the BCM is to control:
- The exterior and interior lighting
- Direction indicators and hazard warning lights
- Central locking system
- Comfort opening/Comfort closing
The BCM also has the task of gathering information from
- P-brake switch
- Level sensor for coolant/brake fluid
- Outside temperature sensor
- Seat belt warning
- A/C and Electrically heated rear window button (MCC)

Type
The BCM has a microprocessor with clock, RAM memory and a flashable ROM. An internal bus that interconnects the processor and memory with the I/O unit. The I/O unit answers for gathering values from the A/D converter for analogue inputs, digital inputs, bus and to activate the transistors in the power amplifiers.

For information on the control module, see Control modules, general description.

Power supply, ground and bus communication

Pin No. 6 - 41:

+30 is fed via the connector which is directly connected to the main fuse box.