Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSAAB20059-3 LINEAR (9440) L4-2.0L TURBO (2.0T)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSBODY CONTROL MODULEDESCRIPTION AND OPERATIONBCM BODY CONTROL MODULE (707)
2005 Saab 9-3 Linear (9440) L4-2.0L Turbo (2.0t)
BCM Body Control Module (707)
2005 Saab 9-3 Linear (9440) L4-2.0L Turbo (2.0t)SECTION BCM Body Control Module (707)
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.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.