Honda HR-V: Security System Keyless Entry System - Testing & Troubleshooting

DTC TROUBLESHOOTING

DTC B1575 AUTO LIGHT SENSOR ERROR

DTC (Automatic Lighting 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. Check for DTCs with the HDS.

Is DTC B1575 indicated?

YES

Replace the automatic lighting control unit-sensor.

NO

Intermittent failure, the system is OK at this time.

DTC U1280 AUTOMATIC LIGHTING CONTROL UNIT) BUS OFF STATE IS DETECTED BY CAN CONTROLLER

DTC (Automatic Lighting 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.

DTC U1281, U128D (AUTOMATIC LIGHTING CONTROL UNIT) AUTO LIGHT CONTROL UNIT LOST COMMUNICATION WITH MICU

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.

DTC (Automatic Lighting 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 U1281 or U128D indicated?

YES

Go to step 2.

NO

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

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

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

Automatic lighting control unit-sensor 7P connector

3. Disconnect the transmitting control unit connectors.

Gauge control module connector A (32P)

Under-dash fuse/relay box connector D (24P)

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 (LOCK) mode.

Is there continuity?

YES

The B-CAN_L to B-CAN_H wire is OK. Go to step 3.

NO

Repair an open or high resistance in the B-CAN_H and/or B-CAN_L wire(S) 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 all connectors.
2. Turn the vehicle to the ON mode.
3. Clear the DTCs with the HDS.

Clear DTCs

4. Check for DTCs with the HDS.

Is U1281 and U128D indicated?

YES

Check for loose terminals and poor connections in the automatic lighting control unit-sensor connector.

Check is OK, replace the automatic lighting control unit-sensor.

NO

The automatic lighting control unit-sensor 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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