Symptom Troubleshooting Information

Symptom Troubleshooting Information

General Check before Troubleshooting

Before troubleshooting the immobilizer system, check the following general items:

- If 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, 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

NOTE: When symptom troubleshooting the immobilizer system, the built-in key must be in the ignition switch.

The pattern of the immobilizer indicator light can help troubleshooting the condition of the immobilizer system and the keyless access system. Following are descriptions of the five possible patterns:

Normal operation
When the ignition switch is turned 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 OFF.

+B line open
When the ignition switch is turned 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 OFF.

Immobilizer code is not identified
When the ignition switch is turned ON (II) but the immobilizer code is not identified, the immobilizer indicator comes on for 2 seconds, then blinks until the ignition switch is turned OFF. The state of the immobilizer key registration and the IMOCD line can be checked by doing a SYSTEM CHECK with the HDS, also check the STATUS LOG and diagnose the line with the highest count first. The immobilizer indicator goes off when the ignition switch is turned OFF.

Immobilizer indicator does not come on
If the immobilizer indicator does not come on when the ignition switch is turned 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 and keyless access control unit, and imoes unit (IMOCD line).
- Measure the voltage to the immobilizer control unit-receiver IG1 and VBU +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 ON (II), check for a short to ground in the immobilizer circuit between the gauge control module and the 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 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 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 in Computers and Control Systems.

2. At the MAIN MENU, enter IMMOBILIZER, then select the IMMOBILIZER 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. 7 (10 A) fuse in the driver's under-dash fuse/relay box.

System Check

If a System Check result is indicated on the HDS display, troubleshoot the appropriate items in the table. If there is no Status Check result, Go to Status Log.






Status Log

If the symptom does not occur again during the System Check, check the Status Log with the HDS, and troubleshoot the items by the Status Log table shown.

Diagnose the status log number starting with the largest count.