Inspection Of Bcm And Its Circuits - Suzuki Swift Sport 2004 Service & Repair Manual

10B-31 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 assembly) referring to "BCM (Included in Junction Block Assembly)
Removal and Installation".
3) Connect connectors to BCM (1) and junction block assembly (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 Assembly".
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
L01-4 Rear end door opener switch
Manual door lock switch
L01-5
(Unlock)
L01-6 Parking brake switch
L01-7 Driver side door switch
Normal voltage
10 – 14 V
0 V
—
10 – 14 V
0 V
10 – 14 V
0 V
10 – 14 V
0 V
*0 – 3 V
10 – 14 V
0 V
10 – 14 V
0 V
Unlock signal is output for passenger side door lock
actuator
Unlock signal is not output for passenger side door lock
actuator
—
Rear end door is closed
Rear end door is opened
Rear end door switch is not pushed
Rear end door switch is pushed
Manual door lock switch is at any position other than
unlock position
Manual door lock switch is at unlock position
↑↓
Refer to "Reference waveform No. 1: "
Ignition switch is at ON position and parking brake lever
is pulled up
Driver side door is closed
Driver side door is opened
S7RS0BA204018
1
2
I4RS0AA20030-01
Condition
—