Troubleshooting - B-CAN System Diagnosis Test Mode A

NOTE: AcuraLink can be used to easily check for B-CAN line failure (see SELF-DIAGNOSTIC FUNCTION ).

Do this diagnosis first if the symptom is related to the B-CAN system.

NOTE: Always turn the ignition switch within 3 seconds when prompted in the DTC troubleshooting procedures in this section.

Check the symptom against this list of B-CAN related systems:
- Gauge control module
- Exterior lights
- Turn signals
- Entry light control
- Interior lights
- Safety indicators
- Rear window defogger
- HandsFreeLink
- Horns (security and panic)
- Chimes (key, seat belt, lights-on and parking brake)
- Power windows
- Power window/moonroof timer
- Wiper/washer
- Security
- Keyless entry
- Power door locks
- Climate control
- Key interlock
- Dash light brightness
- Driving position memory
- Keyless access
- OnStar ('05-06 models)
- XM radio
Is the symptom related to the B-CAN system?

YES - Go to step 2.

NO - Go to the system troubleshooting for the system with the symptom.
Connect the HDS, then turn the ignition switch ON (II).
From the BODY ELECTRICAL SYSTEM SELECT menu, select UNIT INFORMATION, and then select CONNECTED UNIT listed to see if it is communicating with the HDS.
- MICU
- Gauge control module
- Combination switch control unit
- Relay control module
- Power seat control unit
- HandsFreeLink control unit
- Driver's MPCS unit
- Adaptive front lighting control unit
- OnStar control unit ('05-06 models)
- AcuraLink control unit (XM receiver)
- Keyless access control unit
- Climate control unit
NOTE:
- If the unit is communicating with the HDS, DETECT will be displayed.
- If the unit is not communicating, "Not Available" will be displayed.
Are all control units communicating with the HDS?

YES - Go to step 4.

NO - If any of them are not communicating, go to B-CAN SYSTEM DIAGNOSIS TEST MODE B . If all units are not communicating or only the MICU is communicating, go to DTC B1000 troubleshooting (see DTC B1000: COMMUNICATION BUS LINE ERROR (BUS-OFF) ).
Select the system that has the problem from the BODY ELECTRICAL SYSTEM SELECT menu, then select DTCs.
Are any DTCs indicated?

YES - Go to step 5.

NO - If the problem is related to one of the following items, go to B-CAN SYSTEM DIAGNOSIS TEST MODE C .
- Exterior lights
- Turn signals
- Entry light control
- Interior lights
- Horns (security and panic)
- Power windows
- 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
- Chimes (key, seat belt and lights-on)
- Rear window defogger (climate control)
- Security
- Keyless entry
- Climate control
- Key interlock
- Dash light brightness
- Audio system
- Navigation
- Driving position memory
- HandsFreeLink
- Keyless access
- Adaptive front lighting
Record all DTCs, and sort them by DTC type using the DTC Troubleshooting.
Troubleshoot the DTC(s) in this order:
- Battery voltage DTCs.
- Internal error DTCs.
- Loss of communication DTCs. Begin troubleshooting with the lowest number first (Example: if DTC B1005 and B1008 are retrieved, begin by troubleshooting B1005).
- Signal error DTCs.