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.
- Clear the DTCs with the HDS.
Clear DTCs
- Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
- Wait for at least 6 seconds.
- 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.
- Clear the DTCs with the HDS.
Clear DTCs
- Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
- Wait for at least 6 seconds.
- 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).
- Turn the vehicle to the OFF (LOCK) mode.
- Disconnect the receiving control unit connector.
Immobilizer-keyless control unit 7P connector
- 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)
- 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).
- Reconnect the following connectors.
Immobilizer-keyless control unit 7P connector Gauge control module connector
A (32P)Under-dash
fuse/relay box connector H (20P)
- Turn the vehicle to the ON mode.
- Clear the DTCs with the HDS.
Clear DTCs
- Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
- Wait for at least 6 seconds.
- 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.)
READ NEXT:
Removal & Installation
NOTE:
SRS components are located in this area. Review the SRS component
locations - Refer to: SRS
Component Location Index (KA/KC), or SRS Component Location Index (KA/
Removal & Installation
NOTE: If the keyless access control unit is replaced, do the keyless access
registration. If the original keyless
access control unit is installed, confirm that all systems
SEE MORE:
Removal & Installation
SRS components are located in this area. Review the SRS component locations -
Refer to: SRS Component
Location Index (KA/KC), or SRS Component Location Index (KA/KC) and the
precautions and
procedures before doing repairs or service.
NOTE :
Before installing the frame,
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 (Front Seat Heater Control Unit)
NOTE :
If you are troubleshooting multiple DTCs, be sure to follow the
instructions in B-CAN System Diagnosis
Tes