Honda Accord: Symptom Troubleshooting
Information - Immobilizer System - Body Electrical - Honda Accord MK8 2008-2012 Service ManualHonda Accord: 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, 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 can help troubleshoot the condition of the immobilizer system. Here are descriptions of the four possible patterns:

Normal operation

If the immobilizer code is identified, the immobilizer indicator quickly flashes once when the ignition switch is turned 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 will quickly flash once, then will blink until the ignition switch is turned to LOCK (0). When the ignition switch is turned to LOCK (0), the indicator will blink ten times, then go OFF to show the system has correctly reset.

The state of the immobilizer key registration and the IMOCD (S-NET) line can be checked by doing a SYSTEM CHECK (see page 22-434) and STATUS LOG CHECK (see page 22-436) with the HDS.

Immobilizer indicator does not come on

If the immobilizer indicator does not come on after turning the ignition switch to ON (II), there is an open or short in the F-CAN lines between the ECM/PCM and the gauge control module. Watch the malfunction indicator lamp (MIL). If the MIL stays on, go to the PGM-FI system troubleshooting (see page 11-65).

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 self-diagnostic function (see page 22-332). If the indicator drive circuit is OK, do the SYSTEM CHECK and STATUS LOG CHECK with the HDS.

Symptom IVotsbleshooting Using Malfunctioning Circuit Functions

If a malfunction o c c u r s i n the immobilizer circuit, use the table to cross-reference the malfunction criteria to the line(s) that should be checked table:

System Check  and Status Log


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 MAIM MENU.

NOTE: If the HDS does not communicate with the vehicle, go to the DLC circuit troubleshooting (see page 11 -181).

2. At MAIN MENU, enter IMMOBI, then select IMMOBILIZER SETUP.

3. Do the SYSTEM CHECK. If there is a system check number, do the troubleshooting for the item indicated (see page 2 2 - 4 3 4 ) .

4. Check the STATUS LOG using the HDS. Troubleshoot the line with the highest counts first (see page 22-436). 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 (see page 11-14).

NOTE: Once repaired, clear the status log by removing the No. 15 (10 A) fuse in the under-hood fuse/relay box or disconnecting the battery.

    DTC Troubleshooting
    DTC U0155: Immobilizer-keyless Control Unit Lost Communication With Gauge Control Module NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosi ...

    Symptom Troubleshooting Index
    1. Troubleshoot the Immobilizer system in the order shown: ...

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