Steering lock unit power supply check
1) Connect keyless start control module connector.
2) With ignition switch at ON position, check power supply
terminal voltage of steering lock unit connector. Refer to
"Keyless Start Control Module Power and Ground Circuit
Check in Section 10E".
Is voltage 4 – 6 V?
DTC P1616: Unregistered Keyless Start Control Module
Refer to "Immobilizer Control System Wiring Circuit Diagram".
P1616 is detected when ECM detects different ID codes registered in ECM and keyless start control module after
turning engine start knob to ON position. Normally, when keyless start control module is replaced with new one, ECM
automatically registers the applicable code in keyless start control module after turning ignition switch to ON position.
However, when keyless start control module is replaced with used one, ECM does not automatically register the
applicable code in keyless start control module even if ignition switch is turned to ON position.
Detecting Condition and Trouble Area
ECM detects different ID codes registered in ECM and
keyless start control module.
Was "Immobilizer Control System Check" performed?
Registration of the ignition key
1) Register the ignition key with ECM referring to
"Registration of the Ignition Key".
Was registration of ignition key completed?
DTC check of ECM
1) Check DTC referring to "DTC Check".
Is DTC P1618 and/or P1615 detected other than P1616?
Immobilizer Control System:
Replace steering lock
unit and recheck.
• Keyless start system wire circuit
• Keyless start control module
Go to Step 2.
Recheck ECM for DTC. Go to Step 3.
Go to DTC P1618
Substitute a known-
good keyless start
control module and
recheck. If DTC P1615
is still detected,
substitute a known-
good ECM and recheck.
Go to "Immobilizer
Control System Check".
Go to DTC P1615