10C-8 Immobilizer Control System:
DTC P1616: Unregistered Keyless Start Control Module (for Vehicle with Keyless Start System)
S5JB0EA304010
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram: ”
Circuit Description
P1616 is detected when ECM detects different ID codes registered in ECM and keyless 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
Troubleshooting
Detecting Condition Trouble Area
ECM detects different ID codes registered in ECM and
keyless control module.
• Keyless start control unit faulty
• ECM faulty
Step Action Yes No
1 Diagnostic Trouble Code (DTC) confirmation
1) Clear DTC(s) referring to “Diagnostic Trouble Code
(DTC) Clearance: in related manual”.
2) Turn the ignition switch to OFF position.
3) Check if any DTC is detected referring to “Diagnostic
Trouble Code (DTC) Table: ”.
Is DTC P1616 still detected?
Go to Step 2. The troubleshooting is
completed.
2 Registration of the ignition key
1) Clear DTC referring to “Diagnostic Trouble Code (DTC)
Clearance: in related manual”.
2) Register the transponder code in the transponder in the
ignition key with ECM referring to “Registration of the
Ignition Key: in related manual”.
Was it possible to register the ignition key (transponder
code) in ECM?
Go to Step 3. Go to Step 4.
3 Keyless start system operation check
1) Start engine using keyless start system.
Does engine start?
The troubleshooting is
completed.
Check if any DTC is
detected by ECM. If
detected, perform the
troubleshooting
referring to the
corresponding
flowchart.
4 Diagnostic Trouble Code (DTC) check
1) Check ECM for DTC referring to “Diagnostic Trouble
Code (DTC) Check: in related manual”.
Are DTC P1618 and/or P1615 detected other than P1616?
Go to DTC P1618
troubleshooting.
Go to DTC P1615
troubleshooting.
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