Honda HR-V: Immobilizer-Keyless Entry Control Unit - Diagnostics

DTC TROUBLESHOOTING

DTC U1280 COMMUNICATION BUS LINE ERROR (BUS-OFF) (IMMOBILIZER-KEYLESS CONTROL UNIT)

DTC (Immobilizer-Keyless Control Unit)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks.

1. Problem verification.

1. Clear the DTCs with the HDS.

Clear DTCs

2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
3. Wait for at least 6 seconds.
4. Check for DTCs with the HDS.

Is DTC U1280 indicated?

YES

Go to MICU DTC U1280 troubleshooting.

NO

Intermittent failure, the system is OK at this time. Check for loose or poor connections.

DTC U1281, U128D (IMMOBILIZER-KEYLESS CONTROL UNIT)

NOTE:

• Refer to the DTC code shown on the display, and then inspect the connectors and terminals based on the instructions in the table below.
• The DTC may be stored due to the grounding failure or the power source failure at the transmitting control unit (the grounding inspection and the power source inspection on each control unit are required prior to this checking process).

DTCs (Immobilizer-Keyless Control Unit)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks.

1. Problem verification.

1. Clear the DTCs with the HDS.

Clear DTCs

2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
3. Wait for at least 6 seconds.
4. Check for DTCs with the HDS.

Are any DTCs indicated?

YES

Go to step 2.

NO

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control units, and immobilizer-keyless control unit.

2. Open wire check (B-CAN_H, B-CAN_L lines).

1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the receiving control unit connector.

Immobilizer-keyless control unit 7P connector

3. Disconnect the transmitting control unit connectors. (Refer to the DTC code shown on the display, and then disconnect the connector(s) based on the instructions in the table below.)

Under-dash fuse/relay box connector H (20P)

Gauge control module connector A (32P)

4. Check for continuity between the receiving control unit and the transmitting control unit on the B-CAN_H circuit and the B-CAN_L circuit as specified in the table while in the vehicle OFF mode.

Is there continuity?

YES

The B-CAN_H and B-CAN_L wires are OK. Go to step 3.

NO

Repair an open in the B-CAN_H and/or B-CAN_L wires between the receiving control unit and the transmitting control unit.

3. Determine possible failure area (the receiving control unit or the transmitting control unit).

1. Reconnect the following connectors.

Immobilizer-keyless control unit 7P connector Gauge control module connector A (32P)Under-dash fuse/relay box connector H (20P)

2. Turn the vehicle to the ON mode.
3. Clear the DTCs with the HDS.

Clear DTCs

4. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
5. Wait for at least 6 seconds.
6. Check for DTCs with the HDS.

Are any DTCs indicated?

YES

Replace the immobilizer-keyless control unit.

NO

The immobilizer-keyless control unit is OK at this time, replace the transmitting control unit. (Refer to the DTC code shown on the display, and then replace the control unit based on the instructions in the table below.)

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