Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)
Shift to Test Mode 1
Check the PCM for DTCs and troubleshoot PCM or F-CAN loss of communication errors first, then do this diagnosis if the HDS is not available.
1. Check the +B_BACK_UP and the IG1_FUEL_PUMP fuses. If a fuse is blown, find and correct the cause, then replace the fuse(s).
2. Turn the front individual map light switch OFF, the interior light switch to the DOOR position, and close all doors.
Do steps 3-7 within 10 seconds.
3. Turn the vehicle to the ON mode.
4. Pull and hold the passing switch in its PASSING position.
5. While holding the combination light switch in the PASSING position, turn to the PARKING position, then release, pull, and hold the combination light switch in its PASSING position.
6. Turn the combination light switch to OFF, then turn it to the PARKING position, and turn to the OFF position two more times.
7. Release the combination light switch.
8. Wait 5 seconds, and watch the individual map lights. When the lights flash quickly once, the system enters in Test Mode 1.
9. If the individual map lights keeps blinking after entering Test Mode 1. Check for B-CAN unit communication error.
| Error | Display code(blinking pattern) |
|---|---|
| Communication bus line error (BUS OFF). | 1 |
| The body control module cannot receive signals from the gauge control module. | 5 |
10. If there is a malfunction when the display code is checked, the code will be displayed. If there is no malfunction, nothing will be displayed. When the display code is displayed, it is displayed ON/OFF in 0.5 second intervals, repeating the display every 3 seconds. The codes are displayed repeatedly in ascending order starting from the smallest value code.
7 inch MID
10 inch MID
The control unit that has stored the code can be identified by the number shown after the letter "PA" on the multi-information display (MID).
| Control Unit | Control Unit I.D. Number |
|---|---|
| Relay control module | 11 |
| Body control module | 18 |
| Driver's door control unit | 30 |
| Power tailgate control unit | 31 |
| Gauge control module | 50 |
| Climate control unit | 51 |
| Automatic lighting control unit-sensor | 72 |
| Left front lighting control unit | 7A |
| Right front lighting control unit | 7B |
| Telematics control unit | 91 |
| Power seat control unit | 95 |
| Multi view camera unit | 9C |
| Left side BSI radar unit | 9F |
| Ventilated seat control unit | A2 |
| Front seat heater control unit | A2 |
| Right side BSI radar unit | A7 |
| Second row seat heater control unit | AC |
| Wireless charger | AF |
NOTE: You can also check B-CAN communication status by the following methods:
- The MICU self-diagnostic function Test Mode 1 and Test Mode 2 can check some communication statuses and some switch circuits.
- The gauge control module self-diagnostic function can check communication status .
11. Record all DTCs and sort them by DTC type, then troubleshoot them in this order:
- Internal error DTCs
- Loss of communication DTCs
- Signal error DTCs
- Receiving malfunction information DTCs
12. Clear the DTCs by pressing and holding the right multi-function steering wheel controller 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.
Shift to Test Mode 2
NOTE: Do steps 14-17 within 10 seconds.
14. Pull and hold the passing switch in its PASSING position
15. While holding the combination light switch is in PASSING position, turn to the PARKING position, then release, pull, and hold the combination light switch in its PASSING position.
16. Turn the combination light switch to OFF, then turn to the PARKING position, and turn to OFF two more times.
17. Release the combination light switch.
18. Wait 5 seconds, and watch the individual map lights. When the lights flash two times quickly and then turn off, the system is in Test Mode 2.
If you repeat this procedure, the system automatically returns to Test Mode 1.
19. The following table list the relevant units that have 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 blink once. If the circuit is faulty, there is no such indication.
- If the individual map lights do not blink even when a switch is operated, check two or three other circuits listed in the table. If the individual map lights blink for each circuit, the additional circuits are OK; repair the short or open circuit that failed the test in step 19.
- If the individual map lights do not blink again, this means that the control unit has failed without triggering a DTC. Test a few more circuits. If they also fail, check the related control units using their input tests.
- Body Control Module
- Driver's Door Control Unit
- Gauge Control Module
- Power Seat Control Unit
- Relay Control Module