Suzuki 2006 SX4, Service Manual

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10B-1 Body Electrical Control System:
Control Systems
Body Electrical Control System
Precautions
Precautions in Diagnosing Trouble
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• Diagnostic information stored in BCM memory can be
cleared as well as checked by using SUZUKI scan
tool. Before using scan tool, read its Operator’s
(Instruction) Manual carefully to have good
understanding as to what functions are available and
how to use it.
• Be sure to read “Precautions for Electrical Circuit
Service in Section 00” before inspection and observe
what is written there.
• Communication of ECM, TCM (A/T model), ABS
control module, 4WD control module (if equipped),
keyless start control module (if equipped),
combination meter and BCM is established by CAN
(Controller Area Network). For detail of CAN
communication for BCM, refer to “CAN
Communication System Description”. Therefore,
handle CAN communication line with care referring to
“Precaution for CAN Communication System in
Section 00”.
General Description
BCM General Description
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The Body electrical Control Module (BCM) is
incorporated in junction block. Do not attempt removal of
BCM from junction block as it may cause contact failure.
The BCM incorporates relays and controllers which are
used for the following systems and controls them.
• Power door lock (if equipped)
• Keyless entry (if equipped)
• Door lock function of keyless start system (if
equipped)
• Rear wiper
• Combination meter
• Interior light
• Warning buzzer
• Rear end door window defogger
• Rear end door opener (if equipped)
• Theft deterrent light
Also, the BCM has a function to cause the interior light
and open door warning light in the combination meter to
turn off when any door is left open for longer than 15
minutes to reduce wasteful battery consumption.
In addition, it is possible to check operation of actuator
which is controlled by BCM by using the output test
function of SUZUKI scan tool to operate actuator
simulatively.
CAN Communication System Description
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Refer to “CAN Communication System Description in Section 1A” for CAN communication system description.
BCM communication control data with each control module as follows.
BCM Transmission Data
A/C switch ON signal
Electric load signal
Brake fluid level switch signal
Parking brake switch signal
Diagnostic trouble code (DTC)
Illumination ON signal
Seat belt buckle switch signal
Charging system signal
Engine oil pressure switch signal
Door switch status
Door lock status
ECM
Keyless Start
Control Module
(if equipped)
Combination
Meter
BCM
Transmit
DATA
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