Suzuki Swift Sport 2004 Service & Repair Manual page 1419

BCM Power Circuit and Ground Circuit Check
Wiring Diagram
[A]: Junction block assembly connector viewed from harness side
1. BCM
2. Junction block assembly
Troubleshooting
Step
1 Fuse check
1) Turn ignition switch to OFF position.
2) Check circuit fuses for condition.
Are circuit fuses in good condition?
2 Power supply circuit check
1) Disconnect connectors from junction block assembly.
2) Check for proper connection to junction block assembly
connector at terminal "E40-2".
3) If OK, then measure voltage between "E40-2" terminal of
junction block assembly connector and vehicle body
ground.
Is voltage 10 – 14 V?
Action
Body Electrical Control System:
3. Ignition switch
4. Battery
Yes
Go to Step 2.
Go to Step 3.
10B-16
S7RS0BA204007
I4RS0AA20008-01
No
Replace fuse and check
for short circuit to
ground.
Repair power supply
circuit.