Immobilizer System Symptom Troubleshooting Information
Immobilizer System Symptom Troubleshooting Information
Symptom Troubleshooting by the Immobilizer Indicator Lighting Pattern
Immobilizer system condition can be checked by the immobilizer indicator lighting pattern.
Normal operation
If the immobilizer code is identified, the immobilizer indicator comes on for 2 seconds, then goes off after turning the ignition switch to ON (II).
The immobilizer indicator does not come on when the ignition switch is turned to LOCK (0).
Immobilizer code is not identified
If the immobilizer code is not identified, the immobilizer indicator comes on for 2 seconds, then blinks after turning the ignition switch to ON (II).
The immobilizer indicator blinks ten times, then goes off when the ignition switch is turned to LOCK (0).
The state of the immobilizer key registration and the IMOCD (S-NET) line can be checked by doing a SYSTEM CHECK and STATUS LOG CHECK with the HDS. Immobilizer System Status Log
Immobilizer indicator does not come on
If the immobilizer indicator does not come on after turning the ignition switch to ON (II), there may be an open or short in the F-CAN lines between the ECM/PCM and the gauge control module (tach). Watch the malfunction indicator lamp (MIL). If the MIL stays on, go to the PGM-FI system troubleshooting, R18A1 engine, MIL Circuit Troubleshooting K20Z3 engine. MIL Circuit Troubleshooting
Immobilizer indicator does not go off
If the immobilizer indicator does not go off after turning the ignition switch to ON (II), do the gauge control module (tach) self-diagnostic function. If the indicator drive circuit is OK, do the SYSTEM CHECK with the HDS.
General Check before Troubleshooting
Before troubleshooting the immobilizer system, check the following general points and solve any if applicable.
- Battery is low; charge the battery fully, then troubleshoot the immobilizer system.
- Ignition key is not a genuine Honda part; use the Honda-approved key blank, register the key, then troubleshoot the immobilizer system.
- Key ring, or keys, or a key case is used; remove the key from it, and troubleshoot the immobilizer system with a key only.
- Aftermarket electrical part is attached; remove it, then troubleshoot the immobilizer system.
How to Troubleshoot
NOTE: If the HDS does not communicate with the vehicle, go to the DLC circuit troubleshooting, R18A1 engine, Testing and Inspection K20Z3 engine. Testing and Inspection
1. Do the PGM-FI system DTCs check. If there is any DTC, go to the indicated DTC troubleshooting.
2. Do the Body Electrical DTCs check. If there is any DTC, go to the indicated DTC troubleshooting.
3. Do the system check using the HDS. If there is a system check number, do the troubleshooting for the item indicated. Immobilizer System Check
4. Check the status log using the HDS. Troubleshoot the line with the highest counts. Immobilizer System Check If all the lines are "0" zero, the problem may not be caused by the immobilizer system, check for ignition or fuel problems.
NOTE: Once repaired, clear the status log by removing the back up power fuse, or disconnecting the battery.
Symptom Troubleshooting of an open Power Supply and Ground Circuit
If a malfunction occurs in the immobilizer circuit for the VBU, IG1 and GND (LG) lines, identify the lines to check with this table.
System Check and Status Log
NOTE: The HDS can be used to:
- Check the state of the immobilizer key registration and the IMOCD (S-NET) line by doing a SYSTEM CHECK.
- Check the number of times the immobilizer control unit-receiver doesn't permit the engine to run by checking the STATUS LOG.
1. Connect the HDS to the data link connector, then turn the ignition switch to ON (II) and follow the prompts to the MAIN MENU.
NOTE: If the HDS does not communicate with the vehicle, go to the DLC circuit troubleshooting, R18A1 engine, Testing and Inspection K20Z3 engine. Testing and Inspection
2. At the MAIN MENU, enter IMMOBILIZER, then select the IMMOBI SET UP.
3. Do the SYSTEM CHECK. If there is a system check number, do the troubleshooting for the item indicated.
4. Check the STATUS LOG using the HDS. Troubleshoot the line with the highest counts. If all the lines are "0" zero, the problem may not be caused by the immobilizer system; check for ignition or fuel problems.
NOTE: Once repaired, clear the status log by removing the No. 23 (10 A) fuse in the under-hood fuse/relay box or disconnecting the battery.