Control module, BCM (707)
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Control module, BCM (707)
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The exterior and interior lighting
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Direction indicators and hazard warning lights
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Gateway between the two galvanically separated I-buses.
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Comfort opening/Comfort closing
The BCM also has the task of gathering information from
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Level sensor for coolant/brake fluid
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Outside temperature sensor
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Rheostat, instrument illumination
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Anti-theft alarm bonnet switch,
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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
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Power supply, ground and bus communication
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Pin
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Signal type
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Description
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6
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Electronic ground
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For everything except fuel filler flap solenoid
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21
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Power ground
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For fuel filler flap solenoid
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5
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+30
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For everything except fuel filler flap solenoid
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16
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+30
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For fuel filler flap solenoid
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40
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I-bus
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Bus communication
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41
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I-bus
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Bus communication
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24
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I-bus
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Bus communication between the EHU, SDAR, OnStar, TMC and other control modules connected to the bus
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+30 is fed via the connector which is directly connected to the main fuse box.
