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)
Special Tools Required
- MPCS (MCIC) Service Connector 07WAZ-001010A
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. 15 (10 A) fuse in the under-hood fuse/relay box and the No. 12 (7.5 A) fuse in the driver's under-dash fuse/relay box.
Are the fuses OK?
YES -
Go to step 2.
NO -
Replace the fuse(s). If the fuse blows again, repair a short to ground on the fuse circuit(s).
2. Remove the driver's dashboard undercover Driver's Dashboard Undercover Removal / Installation.
3. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and move the individual map light switch to the middle (door) position.
4. Connect the MPCS service connector (A) to the MICU service check connector socket (B) in the driver's under-dash fuse/relay box.
5. Wait 5 seconds, and watch the individual map light. When the individual map light flashes quickly once and then goes off, the system is in Test Mode 1.
6. Check for B-CAN DTCs indicated by the 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 will read NO Reading and Clearing Diagnostic Trouble Codes.
NOTE: If the test times out, remove the MPCS service connector, turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, and repeat steps 3 and 4.
Are any DTCs indicated?
YES -
Go to step 7.
NO -
Go to step 10.
7. Record all DTCs, and sort them by DTC type.
8. Troubleshoot the DTC(s) in this order:
- Battery voltage DTCs
- Internal error DTCs
- Loss of communication DTCs
- Signal error DTCs
9. Clear the DTCs by pressing and holding the SEL/RESET button for about 10 seconds.
10. You will hear a beep to confirm the codes have been cleared. Operate the devices that failed, and recheck for codes.
Test Mode 2
11. Remove the MPCS service connector from the driver's under-dash fuse/relay box MICU service check connector socket for 5-10 seconds, then re-insert it to enter Mode 2. When the system enters Mode 2, the individual map light flashes two times quickly and then goes off.
NOTE: If the MPCS service connector is disconnected for too short or too long of a time, or if the ignition switch is turned to LOCK (0), or if the vehicle is in OFF mode, the systems returns to Test Mode 1.
12. 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 light blinks once. If the circuit is faulty, there is no indication.
Driver's MICU
Passenger's MICU
Door Multiplex Control Unit
Front Passenger's Power Window Switch
Power Seat Control Unit
Does the individual map 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, short, or replace the faulty switch.