Troubleshooting - B-CAN System Diagnosis Test Mode 1 And Test Mode 2 (Without The HDS)

Multiplex Integrated Control System Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)

Test Mode 1

Check the PCM for DTCs and troubleshoot PCM Initial Inspection and Diagnostic Overview or F-CAN loss of communication errors first, then do this diagnosis if the HDS is not available.

1. Check the No. B16 (10 A) fuse in the under-hood fuse/relay box and the No. C11 (7.5 A) fuse in the driver's under-dash fuse/relay box.

Are the fuses OK?

YES -

Go to step 2.

NO -

Find and repair the cause of the blown fuse(s).

2. Move the interior light switch to the DOOR position.

NOTE: Do steps 3 to 7 within 10 seconds.

3. Turn the ignition switch to ON (II).

4. Pull and hold the combination switch in its Passing position.





5. While holding the switch, turn on the headlights, then release, pull, and hold the switch in its Passing position.

6. Turn off the headlights, then turn the headlights ON and OFF, 2 times.

7. Release the combination switch.

8. Wait 5 seconds, and watch the individual map lights and ignition key light. When the lights flash quickly once and then go off, the system is in Test Mode 1.

9. Check for B-CAN DTCs indicated by the gauge control odo/trip display or multi-information display (MID) on the gauge control module while still in Test Mode 1. Press the SEL/RESET button to display the next code. After you get to the last code, the display shows END. If no DTCs are stored, the display reads NO Reading and Clearing Diagnostic Trouble Codes.

NOTE: If the test times out, turn the ignition switch to LOCK (0), and repeat steps 3 to 7.

Are any DTCs indicated?

YES -

Go to step 11.

NO -

Go to step 13.

10. Record all DTCs, and sort them by DTC type.

11. Troubleshoot the DTC(s) in this order:

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

12. Clear the DTCs by pressing and holding the SEL/RESET button for about 10 seconds.

13. You will hear a beep to confirm the codes have been cleared. Operate the devices that failed, and recheck for codes.

Test Mode 2

14. Pull and hold the combination switch in its Passing position.

NOTE: Do steps 13 to 17 within 10 seconds.






15. While holding the switch, turn on the headlights, then release, pull, and hold the switch in its Passing position.

16. Turn off the headlights, then turn the headlights ON and OFF, 2 times.

17. Release the combination switch.

18. Wait 5 seconds, and watch the individual map lights and ignition key light. When the lights flashes two times quickly and then goes off, the system is in Test Mode 2.

NOTE: If you repeat this procedure, the system automatically returns to Test Mode 1.

19. The following tables list the circuits that can be checked in Test Mode 2. Operate the switch that is most closely related to the problem. If the circuit is OK, the individual map lights, ceiling light, and ignition key light blinks once. If the circuit is faulty, there is no indication.

MICU





Relay Control Module





Door Multiplex Control Unit










Front Passenger's Power Window Switch





Rear MICU





Power Seat Control Unit





Does the ceiling light work properly in all switch positions?

YES -

Go to function and input test for the system related to the failure.

NO -

Repair the open or short, or replace the faulty switch.