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 No. A20 and the No. B29
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 front 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.
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 |
| Center display unit | 57 |
| Automatic lighting control unit-sensor | 72 |
| Master lighting control unit | 7F |
| Telematics control unit | 91 |
| Driver's power seat control unit | 95 |
| Left side BSI radar unit | 9F |
| Ventilated seat control unit | A2 |
| Front seat heater control unit | A2 |
| Front passenger's power seat control unit | A3 |
| Right side BSI radar unit | A7 |
| Second row seat heater control unit | AC |
| Wireless charger | AF |
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 .
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
Do steps 14-17 within 10 seconds.
14. Pull and hold the combination light 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 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 blink once. If the circuit is faulty, there is no such indication.
- -
If the front individual map lights do not blink even when a switch is operated, check two or three other circuits listed in the table. If the front 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 front 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
| Item | |
|---|---|
| Driver's door switch | Windshield wiper HI/LO switch |
| Front passenger's door switch | Windshield wiper INT/LO switch |
| Left rear door switch | Windshield wiper MIST switch |
| Right rear door switch | Windshield wiper intermittent dwell time controller |
| Item | |
|---|---|
| Full latch switch (power tailgate closer unit) | Windshield washer switch |
| Tailgate outer handle switch | Rear window wiper switch |
| Hazard warning switch | Rear window wiper INT switch |
| Turn signal switch (LEFT) | Rear window washer switch |
| Turn signal switch (RIGHT) | Heated windshield wiper area switch |
| Headlight switch (ON) | Hands free access power tailgate sensor |
| Headlight switch (OFF) | Driver's door outer handle touch sensor (LOCK) |
| Lighting switch | Front passenger's door outer handle touch sensor (LOCK) |
| Dimmer switch | Driver's door outer handle touch sensor (UNLOCK) |
| Passing switch | Front passenger's door outer handle touch sensor (UNLOCK) |
| Fog light switch | Left rear door outer handle touch sensor (LOCK) |
| Electric parking brake switch | Right rear door outer handle touch sensor (LOCK) |
| TCM (P position/mode) | Left rear door outer handle touch sensor (UNLOCK) |
| Brake pedal position switch | Right rear door outer handle touch sensor (UNLOCK) |
| Left one-touch access switch (seat-back side) | Left rear door lock knob switch (UNLOCK) |
| Left one-touch access switch (seat-cushion side) | Right rear door lock knob switch (UNLOCK) |
| Right one-touch access switch (seat-back side) | |
| Right one-touch access switch (seat-cushion side) | |
Driver's Door Control Unit
| Item | |
|---|---|
| Driver's door lock switch (UNLOCK) | Power window master switch(Driver's window UP, DOWN, AUTO) |
| Driver's door lock switch (LOCK) | |
| Driver's door lock knob switch (UNLOCK) | Power window master switch(Front passenger's window UP, DOWN, AUTO) |
| Driver's door lock knob switch (LOCK) | |
| Driver's door key cylinder switch (UNLOCK) *1 | Power window master switch(Left rear window UP, DOWN, AUTO) |
| Driver's door key cylinder switch (LOCK) *1 | |
| Driving position memory switch (SET) | Power window master switch(Right rear window UP, DOWN, AUTO) |
| Driving position memory switch (POSITION 1) | |
| Driving position memory switch (POSITION 2) | Power mirror switch (RETRACT) |
| Driving position memory switch (POSITION 3) | Driver's power tailgate switch *2 |
*1: Be sure to rotate the door key cylinder switch two times to the desired test position (lock and lock). This ensures the door lock knob switch will no longer respond in that appropriate position, during door key cylinder switch test on third rotation.*2:'25
Gauge Control Module
| Item | |
|---|---|
| Audio remote-HFL switch | VSA OFF switch |
| Brake fluid level switch | ACC combination switch |
| Automatic brake hold switch | Idle stop OFF switch |
| Integrated dynamics system switch ( |
Head up display switch (HUD TILT |
| Integrated dynamics system switch ( |
Head up display switch (HUD TILT |
| Safety support switch | Head up display switch (HUD ILLUMI+) |
| Dashlights brightness control switch | Head up display switch (HUD ILLUMI-) |
| Washer fluid level switch | |
Driver's Power Seat Control Unit
| Item | |
|---|---|
| Driver's slide switch (Forward) | Driver's tilt switch (UP) |
| Driver's slide switch (Backward) | Driver's tilt switch (DOWN) |
| Driver's recline switch (Forward) | Driver's height switch (UP) |
| Driver's recline switch (Backward) | Driver's height switch (DOWN) |
*1: With 12-way power seat*2: With 16-way power seat
| Item | |
|---|---|
| Driver's lumbar support adjustment switch ( |
Driver's lumbar support adjustment switch ( |
| Driver's lumbar support adjustment switch ( |
Driver's lumbar support adjustment switch ( |
| Driver's bolster/lumbar/thigh support adjustment switch ( |
Driver's bolster/lumbar/thigh support adjustment switch ( |
| Driver's bolster/lumbar/thigh support adjustment switch ( |
Driver's bolster/lumbar/thigh support adjustment switch ( |
| Driver's mode select switch (UP) *2 | TCM (P position/mode) |
| Driver's mode select switch (DOWN) *2 | |
*1: With 12-way power seat*2: With 16-way power seat
Front Passenger's Power Seat Control Unit
| Item | |
|---|---|
| Front passenger's slide switch (Forward) | Front passenger's tilt switch (UP) |
| Front passenger's slide switch (Backward) | Front passenger's tilt switch (DOWN) |
| Front passenger's recline switch (Forward) | Front passenger's height switch (UP) |
| Front passenger's recline switch (Backward) | Front passenger's height switch (DOWN) |
| Front passenger's lumbar support adjustment switch ( |
Front passenger's lumbar support adjustment switch ( |
| Front passenger's lumbar support adjustment switch ( |
Front passenger's lumbar support adjustment switch ( |
| Front passenger's bolster/lumbar/thigh support adjustment switch ( |
Front passenger's bolster/lumbar/thigh support adjustment switch ( |
| Front passenger's bolster/lumbar/thigh support adjustment switch ( |
Front passenger's bolster/lumbar/thigh support adjustment switch ( |
| Front passenger's mode select switch (UP) *2 | Front passenger's mode select switch (DOWN) *2 |
*1: With 12-way power seat*2: With 16-way power seat
Relay Control Module
| Item | |
|---|---|
| Hood latch switch | |