Inspection Of Bcm And Its Circuits - Suzuki 2006 SX4 Service Manual

10B-19 Body Electrical Control System:

Inspection of BCM and Its Circuits

BCM and its circuits can be checked at BCM wiring couplers by measuring voltage and resistance.
CAUTION
!
BCM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to BCM
with couplers disconnected from it.
Voltage Check
1) Disconnect negative cable (–) at battery.
2) Remove BCM (included in junction block) referring to "BCM (Included in Junction Block) Removal and Installation".
3) Connect connectors to BCM (1) and junction block (2).
4) Check voltage at each terminal number of couplers connected.
For connector and terminal number, refer to "Connector Layout Diagram of BCM and Junction Block".
1
2
NOTE
• As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when
ignition switch is ON.
• Voltage with asterisk (*) can not be measured by voltmeter because it is pulse signal.
Check it with oscilloscope if necessary.
BCM connector "L01"
Terminal Circuit
Passenger side door lock
L01-1 actuator control (Unlock) (if
equipped)
L01-2 —
L01-3 Rear end door switch
Rear end door opener switch
L01-4
(if equipped)
Manual door lock switch
L01-5
(Unlock) (if equipped)
L01-6 Parking brake switch
L01-7 Driver side door switch
L01-8 —
L01-9 —
Normal voltage
Unlock signal is output for passenger side
10 – 14 V
door lock actuator
Unlock signal is not output for passenger side
0 V
door lock actuator
—
10 – 14 V Rear end door is closed
0 V Rear end door is opened
10 – 14 V Rear end door opener switch is not pushed
0 V Rear end door opener switch is pushed
Manual door lock switch is at any position
10 – 14 V
other than unlock position
0 V Manual door lock switch is at unlock position
*0 – 3 V
↑↓
Refer to "Reference waveform No. 1: "
10 – 14 V
Ignition switch is at ON position and parking
0 V
brake lever is pulled up
10 – 14 V Driver side door is closed
0 V Driver side door is opened
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—
1
2
Condition
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—
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S6RW0CA204017
I4RS0AA20030-01