Immobilizer System Symptom Troubleshooting Information
Immobilizer System Symptom Troubleshooting Information
General Check before Troubleshooting
Before troubleshooting the immobilizer system, check the following general items and solve any if applicable:
- If the battery is low; charge the battery fully, then troubleshoot the immobilizer system.
- If the ignition key is not a genuine Honda part; use the Honda- approved key blank, register the key, then troubleshoot the immobilizer system.
- Check the key ring, or keys, or if a key case is used; remove the key from it, and troubleshoot the immobilizer system with a key only.
- If 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 troubleshooting the condition of the immobilizer system. Following 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 Immobilizer System Check and a STATUS LOG Immobilizer System Status Log CHECK with the HDS.
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 PCM.
- Check for continuity between the immobilizer control unit-receiver and the gauge control module (IMOARM 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 module and the immobilizer control unit-receiver (IMOARM 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 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 Testing and Inspection.
2. At the main menu, enter IMMOBI, then select the IMMOBILIZER SET UP.
3. Do the SYSTEM CHECK Immobilizer System Check. If there is a system check number, do the troubleshooting for the item indicated.
4. Check the status log Immobilizer System Status Log using the HDS. Troubleshoot the line with the highest counts first. If all the lines are zero (0), 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. 7 (7.5 A) fuse in the under-dash fuse/relay box or disconnecting the immobilizer control unit-receiver.