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 resolve then if applicable:
- The battery is low: Charge the battery fully, then troubleshoot the immobilizer system.
- The ignition key is not a genuine Acura part; use the Acura- approved key blank, register the key, then troubleshoot the immobilizer system.
- A key ring keys, or a key case is used; remove the key from it, and troubleshoot the immobilizer system with the key only.
- An aftermarket electrical part is installed; remove it, then troubleshoot the immobilizer system.
Symptom Troubleshooting Using the Immobilizer Indicator Lighting Pattern
NOTE: When symptom troubleshooting the immobilizer system, the built-in key must be in the ignition switch.
The pattern of the immobilizer indicator can help troubleshooting the condition of the immobilizer system and the keyless access system. Here are descriptions of the five possible patterns:
Normal operation
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
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
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 line can be checked by doing a SYSTEM CHECK Immobilizer System Check and STATUS LOG CHECK Immobilizer System Status Log with the HDS.
The immobilizer indicator goes off when the ignition switch is turned to LOCK (0).
Immobilizer indicator does not come on
If the immobilizer indicator does not come on when the ignition switch is turned to ON (II), check for an open in the wire shown:
When the built-in key is used:
- Check for continuity between the immobilizer control unit-receiver, keyless access control unit, and imoes unit (IMOCD line).
- Measure the voltage to the immobilizer control unit-receiver IG1 and +B line.
- Check for continuity between the immobilizer control unit-receiver and the gauge control module (IMOLMP line).
When the keyless access FOB is used:
- Measure the voltage to the keyless access control unit IG1 and IG2, +B1, +B2, and ACC lines.
- Check for continuity between the keyless access control unit and the gauge control module (IMOLMP line).
- Check for continuity between the keyless access control unit and body ground (LG1 and LG2).
- Check for continuity between the keyless access control unit, immobilizer control unit-receiver, and imoes unit (IMOCD line).
Immobilizer indicator does not go off
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 immobilizer control unit-receiver.
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 Immobilizer System Check.
- Check the number of times the immobilizer control unit-receiver dose not permit the engine to run by checking the STATUS LOG Immobilizer System 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 SYSTEM SELECTION MENU.
NOTE: If the HDS does not communicate with the vehicle, go to the DLC circuit troubleshooting Testing and Inspection.
2. At the SYSTEM SELECTION 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 "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. 7 (10 A) fuse in the driver's under-dash fuse/relay box.