Symptom Related Diagnostic Procedures
Immobilizer System Symptom Troubleshooting Information
General Check before Troubleshooting
Before troubleshooting the immobilizer system, check the following general items and solve any if applicable:
- The battery is low; charge the battery fully, then troubleshoot the immobilizer system.
- The ignition key is not a genuine Honda part; use a Honda- approved key blank, register the key, then troubleshoot the immobilizer system.
- A key ring, or keys, or a key case is used; remove the key from it, and troubleshoot the immobilizer system with a key only.
- An aftermarket electrical part is attached; remove it, then troubleshoot the immobilizer system.
Symptom Troubleshooting Using the Immobilizer Indicator Lighting Pattern
The pattern of the immobilizer indicator light can help troubleshoot the condition of the immobilizer system. Here are descriptions of the five possible patterns:
Normal operation (Lighting pattern 1)
When the ignition switch is turned to ON (II) and the immobilizer code is identified, the immobilizer indicator comes on for 2 seconds, then goes off.
The immobilizer indicator blinks five times when the ignition switch is turned to LOCK (0).
+B line open (Lighting pattern 2)
When the ignition switch is turned to ON (II) and the immobilizer code is identified, the immobilizer indicator comes on for 2 seconds, then goes off.
The immobilizer indicator goes off when the ignition switch is turned to LOCK (0).
Immobilizer code is not identified (Lighting pattern 3)
When the ignition switch is turned to ON (II) but the immobilizer code is not identified, the immobilizer indicator comes on for 2 seconds, then blinks. The state of the immobilizer key registration and the IMOCD (S-NET) line can be checked by doing a SYSTEM CHECK with the HDS Immobilizer System Check.
The immobilizer indicator goes off when the ignition switch is turned to LOCK (0).
Immobilizer indicator does not come on (Lighting pattern 4)
If the immobilizer indicator does not come on when the ignition switch is turned to ON (II), check the following items:
- Check that there is battery voltage on the +B line.
- Check that the LG3 line is grounded through the ECM/PCM.
- Check for continuity between the immobilizer control unit-receiver and the gauge control module (IMOLMP line).
- Gauge control module
Immobilizer indicator does not go off (Lighting pattern 5)
If the immobilizer indicator does not go off after the ignition switch is turned to ON (II), check for a short to ground in the immobilizer circuit between the gauge control module and the immobilizer control unit-receiver (IMOLMP line).
Symptom Troubleshooting Using Malfunctioning Circuit Functions
If a malfunction occurs in the immobilizer circuit, use the following table to cross-reference the malfunctioning function to the line(s) that should be checked:
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 can be checked by doing a SYSTEM CHECK with the HDS Immobilizer System Check.
- Check the number of times the immobilizer control unit-receiver doesn't permit the engine to run by checking the STATUS LOG Immobilizer System Status Log.
1. Connect the HDS to the data link connector (DLC), 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 Testing and Inspection.
2. At the MAIN MENU, enter IMMOBI, then select the IMMOBILIZER SETUP.
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 Immobilizer System Status Log. If all the lines are "0" zero, the problem may not be caused by the immobilizer system; check for ignition or fuel problems.
Refer to PGM-FI System Symptom Troubleshooting .
NOTE: Once repaired, clear the status log by removing the No. 9 (10 A) fuse in the under-hood fuse/relay box or disconnecting the battery.