Suzuki SX4 Service Manual page 1616

10C-9 Immobilizer Control System:
Immobilizer Indicator Light Does Not Come ON with Ignition Switch ON and Engine Stop
Wiring Diagram
Refer to "Immobilizer Control System Wiring Circuit Diagram".
Circuit Description
When the ignition switch is turned ON, ECM transmits the indication ON signal to the combination meter to turn ON the
immobilizer indicator light in case that there is not any problem with the immobilizer control system. Then, the
combination meter turns ON the light. When the engine is started up, ECM transmits the indication OFF signal to the
combination meter to turn OFF the light. Then, the combination meter turns OFF the immobilizer indicator light.
However, in case that there is some trouble with the immobilizer control system, the immobilizer indicator light flashes
ON and OFF when the ignition switch is turned ON.
Troubleshooting
Step
1 Immobilizer indicator light power supply check
1) Turn the ignition switch to ON position.
Do other warning lights come ON?
2 DTC check of ECM
1) Check ECM for DTC referring to "DTC Check in Section
1A".
Is DTC U0073, U0101, U0121 and/or U0140 detected?
3 DTC check of BCM
1) Check BCM for DTC referring to "DTC Check in Section
10B".
Is DTC U0073, U0100, U0101, U0155 and/or U1144
detected?
4 Fuse check
1) Turn the ignition switch to OFF position.
2) Check fuse for combination meter circuit.
Is fuse blown?
5 Combination meter power supply wire circuit check
1) Remove combination meter referring to "Combination
Meter Removal and Installation in Section 9C".
2) Check for proper connection at terminals and wires of
combination meter connector.
3) If OK, turn the ignition switch to ON position and
measure voltage between power supply terminal of
combination meter and vehicle body ground. Refer to
"Combination Meter Circuit Diagram in Section 9C".
Is it 10 – 14 V?
6 Combination meter ground wire circuit check
1) Turn ignition switch OFF position.
2) Measure resistance between ground terminal of
combination meter connector and vehicle body ground.
Refer to "Combination Meter Circuit Diagram in Section
9C".
Ω
Is resistance 1 or less?
Action Yes
Go to Step 2.
Go to applicable DTC
diag. flow.
Go to applicable DTC
diag. flow.
Replace blown fuse,
and then check for
short.
Go to Step 6.
Substitute a known-
good combination meter
and recheck. If still
remains OFF, substitute
a known-good ECM and
recheck.
S7RW0AA304006
No
Go to Step 4.
Go to Step 3.
Substitute a known-
good combination meter
and recheck. If
immobilizer indicator
light still remains OFF,
substitute a known-
good ECM and recheck.
Go to Step 5.
Repair open in power
supply wire circuit.
Repair open or high
resistance in ground
circuit.