Honda Accord: Symptom Troubleshooting - Keyless/Power Door
Locks/Security System - Body Electrical - Honda Accord MK8 2008-2012 Service ManualHonda Accord: Symptom Troubleshooting

The horn does not sound and/or the headlights do not flash when the PANIC button on the transmitter is pressed

NOTE: Before troubleshooting, check the B-CAN DTCs. any DTCs are indicated, and troubleshoot the indicated DTCs first.

1. Press the PANIC button.

Do the horns sound? YES

-Go to step 3.

NO

-Go to step 2.

2. Press the horn button.

Do the horns sound? Y E S

- G o io step 3.

NO

-Do the horn switch test (see page 22-198).

3. T u r n the headlight switch to ON (II).

Do the headlights come on? YES

-Go to step 4.

NO

-Check the lighting circuit.

4. Do the transmitter test (see page 22-192).

Is the transmitter OK? YES

-Substitute a known-good immobilizer-keyless control unit and recheck. If there is still a problem, substitute a known-good driver's MICU and recheck.

If the problem goes away, replace the original immobilizer-keyless control unit or MICU.

NO

-Replace the transmitter.

Doors automatically relock 30 seconds after being unlocked with the transmitter even though a door has been opened

NOTE: • Before troubleshooting, check the B-CAN DTCs. If any DTCs are indicated, and troubleshoot the indicated DTCs first.

• The driver's door switch and the left rear door switch are connected to the driver's MICU, and the front passenger's door switch and the right rear door switch are connected to the passenger's MICU.

1. Place the ceiling light switch in the DOOR position.

2. Turn the ignition switch to ON (II).

3. Watch the c e i l i n g light and t h e door m H i o o t o r * в„ў *hc gauge control module.

Do the ceiling light and door indicators come on when each door is opened, and go off when each door is closed? YES

-Substitute a known-good driver's (or passenger's) MICU and recheck. If the symptom goes away, replace the original MICU.

NO

-Repair an open or high resistance in the wire between the driver's (or passenger's) MICU and each door switch. If the wire is OK, replace the door switch.

Kef less operation does not work (LOCK, UNLOCK, PANIC)

NOTE: • If the LOCK and UNLOCK buttons work OK, but the PANIC button does not, see the troubleshooting for the horn does not sound and/or the headlights do not flash when the PANIC button on the transmitter is pressed (see page 22-174).

• Before troubleshooting, check the B-CAN DTCs. If any DTCs are indicated, and troubleshoot the indicated DTC(s) first.

1. Insert the key into the ignition switch, but leave the switch in LOCK (0).

2. Open the driver's door, and listen for the key-in reminder beeper.

Does the beeper sound? YES

-Go to step 3.

NO

-Test the ignition key-in reminder circuit, and recheck.

3. Turn the ignition switch to ON (II).

4. Try to start the engine.

Does the engine start? YES

-The immobilizer system is OK, go to step 5.

NO

-Go to the immobilizer symptom troubleshooting (see page 22-431 ) .

5. Turn the ignition switch to LOCK (0).

6. Test the transmitter (see page 22-192).

Is the transmitter OK? YES

-Replace the immobilizer-keyless control unit.

NO

-Replace the transmitter.

Doors will not unlock (or lock) with the transmitter, but will unlock (lock) with the door switch

NOTE: • Before troubleshooting, check the B-CAN DTCs. If any DTCs are indicated, and troubleshoot the indicated DTC(s) first.

• NOTE: The security system can be customized in the odo/trip display to suit the customer's needs. For more information about keyless/security system options, refer to the Owner's manual.

1. Turn the ignition switch to LOCK (0).

2. Remove the ignition key from the ignition switch.

3. Close and lock the doors.

4. Try to lock/unlock the doors with the keyless transmitter.

Do the door lock actuators work normally? YES

-lntermittent failure, the system is OK at this time.

NO

-Go to step 5.

5. Open the driver's door.

Does the key-in reminder chime sound? YES

-Faulty ignition key switch, or short to ground on the ignition switch wire. Repair as necessary.

NO

-Go to step 6.

6. Do the transmitter test (see page 22-192).

Is the transmitter OK? YES

-Substitute a known-good driver's under-dash fuse/relay box and recheck. If there is still a problem, substitute a known-good immobilizer-keyless control unit and recheck. If the problem goes away, replace the original immobilizer-keyless control unit.

NO

-Replace the transmitter.

    Symptom Troubleshooting Index
    Power Door Locks/Kef less 1. Check for B-CAN DTCs. If any B-CAN DTCs are Indicated, refer to the B-CAN System Diagnosis Test Mode A (see page 22-134) and resolve them first. 2. If the door lock ...

    Control Unit Input Test
    NOTE: Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see page 22-134), and make sure the lighting system works properly. Driver ...

    See also:

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    NOTE; If the moonroof works OK manually, but will not work in AUTO, or reverses frequently (obstacle detection), reset the moonroof (see page 22-371) before proceeding with the input test 1. Turn ...

    Connector to Harness Index
    Starter Subharness Engine Wire Harness (M/T) Engine Wire Harness ( A / T ) *1: PZEV *2: Except PZEV CKP Sensor Subharness Shift Solenoid Wire Harness (A/T) Transmission Rang ...

    Circuit Diagram
    ...