Body Electrical Control System; Precautions In Diagnosing Trouble; General Description; Bcm General Description - Suzuki GRAND VITARA Owner's Manual

Body Electrical Control System

Precautions in Diagnosing Trouble

• 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.

BCM General Description

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 / luggage room light
• Warning buzzer

CAN Communication for BCM

BCM communicates with each of ECM, TCM (if equipped), keyless start control module (if equipped), 4WD control
module (if equipped) and combination meter about the following data. For details of CAN communication, refer to
"CAN Communication System Description: in Section 1A".
• Data which BCM receives from ECM
– Engine speed signal
– Engine coolant temperature signal
– Vehicle speed signal
– Immobilizer registration request signal
– Stop (brake) lamp switch signal
– Magnet clutch signal
– A/C refrigerant pressure signal
– Distance kilometers per liter of fuel signal
• Data which BCM receives from TCM
– Transmission range sensor signal (A/T selector lever position)
• Data which BCM receives from keyless start control module
– Ignition knob switch signal
– Door lock/unlock request signal
– Buzzer request for keyless start system
– Answer back request signal
Precautions
• Communication of ECM, TCM (if equipped), BCM,
S5JB0AA200001 ABS hydraulic unit/control module (if equipped), 4WD
control module (if equipped), keyless start control
module (if equipped) and combination meter is
established by CAN (Controller Area Network).
Therefore, be sure to read "Precaution for CAN
Communication System: in Section 00" before
inspection and handle CAN communication line.

General Description

• Rear end door window defogger and door miller
S5JB0AA201001 heater (if equipped)
• DRL (if equipped)
• Auto-on headlight (if equipped)
• Front fog light (if equipped)
• Alarm indicator lamp
Also, the BCM has a function to cause the interior light
and open door warning lamp 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.

Body Electrical Control System:

10B-1
S5JB0AA201002