Immobilizer Control System: 10C-17
DTC P1638: Immobilizer Information Mismatched
S5JB0EA304017
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram: ”
DTC Detecting Condition and Trouble Area
Troubleshooting
Detecting Condition Trouble Area
• The immobilizer control system information in ECM and
the one in BCM does not match.
• The registration of the immobilizer control system
information in ECM is failed.
• Use of the wrong ECM
• Steering angle sensor (if equipped) faulty
• Keyless start control module (if equipped) faulty
• 4WD control module (if equipped)
• TCM (if equipped) faulty
• CAN communication wire circuits faulty
• BCM faulty
• Combination meter faulty
• ABS/ESP® control module 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) Check: in related manual”.
Is DTC P1638 still detected?
Go to Step 2. The troubleshooting is
completed.
2 Diagnostic Trouble Code (DTC) confirmation
1) Disconnect negative (–) cable from battery for more than
5 seconds.
2) Connect negative (–) cable to battery.
3) Check if any DTC is detected referring to “Diagnostic
Trouble Code (DTC) Check: in related manual”.
Is DTC P1638 still detected?
Go to Step 3. The troubleshooting is
completed.
3 Check ECM specification
1) Check ECM part number to see if ECM is applicable to
the vehicle in service.
Is a correct ECM used for the vehicle in service?
Go to Step 2. Replace ECM with the
correct one and recheck
if DTC P1638 is still
detected by ECM.
4 Diagnostic Trouble Code (DTC) check in ECM
Is any DTC other than P1638 detected in Step 1?
Perform the
troubleshooting
referring to the
corresponding
flowchart.
Go to Step 3.
5 Diagnostic Trouble Code (DTC) check in BCM
1) Check BCM for DTC referring to “DTC Check: in
Section 10B in related manual”.
Is any DTC detected?
Perform the
troubleshooting
referring to the
corresponding flowchart
in Section 10B.
Go to Step 5.
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