Suzuki Wagon R Manual page 4069

8G4-14 IMMOBILIZER CONTROL SYSTEM (Z10XEP / Z12XEP ENGINE MODELS)
DTC B3042 W-Line Circuit Shorted to Ground
Wiring Circuit
Refer to "Wiring Circuit" in this section.
DTC Detecting Condition and Trouble Area
DTC Detecting Condition
W-line circuit voltage is low.
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 ON position.
Is it 10 – 14 V?
Action
[A]: Fig. for Step 2
1. Immobilizer control module connector "G17" (harness side view)
Trouble Area
W-line circuit is shorted to ground
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
ground.
Repair and recheck.