Honda HR-V: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication And DTC Checks

Check the PCM for DTCs and troubleshoot PCM or F-CAN loss of communication errors first, then do this diagnosis if the symptom is related to the B-CAN system.

1. Compare the symptom with this list of B-CAN related systems:

• Audio and audio-navigation
• Gauge control module
• Exterior lights
• Turn signals
• Entry light control
• Interior lights
• Safety indicators
• Horns (security and panic)
• Reminder chimes (Key-in, seat belt, lights-on, and parking brake)
• Power window/moonroof timer
• Wiper/washer
• Security
• Keyless entry
• Key interlock
• Power door locks
• Dashlights brightness
• Immobilizer
• Keyless access control
• Climate control
• Seat heater

• If the symptom is related to the B-CAN, go to step 2.
• If the symptom is not related to the B-CAN, go to the system symptom troubleshooting.

2. Connect the HDS to the data link connector (DLC), then turn the vehicle to the ON mode.

3. From the BODY ELECTRICAL SYSTEM SELECT menu, select B-CAN CONTROL UNITS INFORMATION, and then select CHECK CONNECTED CONTROL UNITS listed to see if the following control units are communicating with the HDS.

• Audio unit or audio-navigation unit
• MICU
• Gauge control module
• Climate control unit
• Automatic lighting control unit/sensor
• Immobilizer-keyless control unit
• Keyless access control unit
• Front seat heater control unit

NOTE :

• If a unit is communicating with the HDS, "DETECT" is displayed.
• If a unit is not communicating or the vehicle is not equipped, "NOT AVAILABLE" is displayed.
• The HDS only checks the status one time when BODY ELECTRICAL is selected. To recheck the status after repair, reboot the HDS.

• If all control units are communicating with the HDS, go to step 4.
• If any of the control units are not communicating, go to B-CAN System Diagnosis Test Mode B - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not Communicating.
• If all units are not communicating or only the MICU is communicating, go to MICU DTC U1280 troubleshooting.

4. Select the system that has the problem from the BODY ELECTRICAL SYSTEM SELECT menu, then select DTCs.

• If any DTCs are indicated, go to step 5.
• If the problem is related to one of the following items and the system that is malfunctioning does not stop or turn off, go to B-CAN System Diagnosis Test Mode C - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFF
• If the problem is related to one of the following items and the system that is malfunctioning does not run or turn on, go to B-CAN System Diagnosis Test Mode D - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode D - No DTCs and Output Won't Turn ON.

• Exterior lights
• Turn signals
• Entry light control
• Interior lights
• Horns (security and panic)
• Wiper/washer
• Power door locks

• If the problem is related to one of the following items, go to the troubleshooting for that individual system.

• Gauge control module
• Safety indicators
• Reminder chimes (Key-in, seat belt, lights-on, and parking brake)
• Security
• Keyless entry
• Dashlights brightness
• Immobilizer
• Rear window defogger (climate control)
• Climate control
• Keyless access control
• Seat heater

5. Record all DTCs, and sort them by DTC type, then troubleshoot them in this order:

• Internal error DTCs.
• Loss of communication DTCs.
• Signal error DTCs.

BODY ELECTRICAL TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE B - CONTROL UNIT NOT COMMUNICATING

Do this diagnosis if any of the control units are not communicating (NOT AVAILABLE is displayed in the HDS) as found by the 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. Using the HDS, select the system that has the symptom from the BODY ELECTRICAL SYSTEM SELECT menu

2. Select DTCs, and then check for loss of communication DTCs.

• If any loss of communication DTCs are indicated, go to step 3.
• If any loss of communication DTCs are not indicated, faulty MICU; replace the under-dash fuse/relay box.

3. Do the power, ground, and communication part of the input test for the unit(s) not communicating with the HDS.

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