Suzuki Wagon R Manual page 4070

DTC B3043 W-Line Circuit Shorted to Battery
Wiring Circuit
Refer to "Wiring Circuit" in this section.
DTC Detecting Condition and Trouble Area
DTC Detecting Condition
W-line circuit voltage is high.
Troubleshooting
Step
1 1) Ignition switch at OFF position.
2) Disconnect connector from ECM.
3) Check for proper connection to ECM at
G21-2 terminal.
Is it in good condition?
2 1) Connect connector to ECM.
2) Measure voltage between G17-7 terminal of
immobilizer control module and body
ground with ignition switch at OFF position
and scan tool disconnected.
Is it 0 – 1 V?
IMMOBILIZER CONTROL SYSTEM (Z10XEP / Z12XEP ENGINE MODELS) 8G4-15
Action
[A]: Fig. for Step 2
1. Immobilizer control module connector "G17" (harness side view)
Trouble Area
W-line circuit is shorted to power supply circuit
Yes
Go to Step 2.
Substitute a known-good
ECM referring to "Proce-
dure after ECM Replace-
ment" in this section and
recheck.
No
Repair or replace.
W-line is shorted to power
supply circuit.
Repair and recheck.