Troubleshooting - B-CAN System Diagnosis Test Mode A

Multiplex Integrated Control System Troubleshooting - B-CAN System Diagnosis Test Mode A

Check the ECM/PCM for DTCs and troubleshoot ECM/PCM, R18A1 engine Initial Inspection and Diagnostic Overview, K20Z3 engine Initial Inspection and Diagnostic Overview 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:

- Gauge control module
- Exterior lights
- Turn signals
- Entry light control
- Interior lights
- Door-open and trunk-open indicators
- Horns (security and panic)
- Chimes (key-in, seat belt, lights-on, and parking brake)
- Power window/moonroof timer
- Wiper/washer
- Security
- Keyless entry
- Power door locks
- Key interlock
- Dashlights brightness control

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.�

2. Connect the HDS to the data link connector (DLC) (A), then turn the ignition switch to ON (II).






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.

- MICU
- Gauge control module
- Immobilizer-keyless control unit
- HandsFreeLink control unit

NOTE:

- If a unit is communicating with the HDS, DETECT will be displayed.
- If a unit is not communicating or the vehicle is not equipped, "NOT AVAILABLE" will be displayed.
- The HDS only checks the connected units status one time when BODY ELECTRICAL is selected. To recheck the status after repair, reboot the HDS and repeat step 3.

Are all control units communicating with the HDS?

YES -

Go to step 4.

NO -

If any of the control units are not communicating, go to B-CAN System Diagnosis Test Mode B Troubleshooting - B-CAN System Diagnosis Test Mode B. If all units are not communicating or only the MICU is communicating, go to DTC B1000 troubleshooting B1000.�

4. 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 and the system that is malfunctioning does not stop or turn off, go to B-CAN System Diagnosis Test Mode C Troubleshooting - B-CAN System Diagnosis Test Mode C. If the problem is related to one of the following items and the system does not work or turn on. Go to Test Mode D Troubleshooting - B-CAN System Diagnosis Test Mode D if the system does not work or turn on.

- Exterior lights
- Turn signals
- Entry light control
- Interior lights
- Horn (security and panic)
- Wiper/washer

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

- Gauge control module
- Door-open and trunk-open indicators
- Chimes (key-in, seat belt, lights-on, and parking brake)
- Security
- Keyless entry
- Key interlock
- Dashlights brightness control
- Audio system
- Navigation system (if equipped)
- HandsFreeLink

5. Record all DTCs, and sort them by DTC type into these categories:

- Battery voltage DTCs.
- Internal error DTCs.
- Loss of communication DTCs.
- Signal error DTCs.

6. Troubleshoot the DTC(s) in the order listed above.