Troubleshooting - B-CAN System Diagnosis Test Mode A

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

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

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

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

- Gauge control module
- Exterior lights
- Turn signals
- Entry light control
- Interior lights
- Safety indicators
- Heated windshield wiper area
- 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
- HVAC/Climate control
- Key interlock
- Dashlight brightness

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, then turn the ignition switch to ON (II).

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

- MICU
- Door multiplex control unit
- Gauge control module
- Combination switch control unit
- Relay control module
- Climate control unit/HVAC 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, "NONE" 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 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 Troubleshooting - B-CAN System Diagnosis Test Mode C if the system does not stop or turn off. Go to Test Mode D Troubleshooting - B-CAN System Diagnosis Test Mode D if the system does not run or turn on.

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

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)
- Heated windshield wiper area (climate control)
- Security
- Keyless entry
- Climate control
- Key interlock
- Dashlight brightness
- Audio system
- Navigation

5. Record all DTCs, and troubleshoot them by DTC type:

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