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 BACK UP fuse and the FI MAIN fuse. If a fuse is blown, find and correct the cause, then replace the fuse.
2. Move the front individual map light switch OFF, the interior light switch to the DOOR position, the ceiling light switch to the MIDDLE 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 is in 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 to the PARKING position, and turn to OFF two more times.
7. Release the combination light switch.
8. Wait 5 seconds, and watch the front individual map lights and the ceiling light. When the lights flash quickly once, the system enters in Test Mode 1.
9. If the front individual map lights and the ceiling light 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. Check for B-CAN DTCs indicated by the LCD display while still in Test Mode 1. Press the TRIP 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.
With Multi-Information Display (MID)
Without Multi-Information Display (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 |
| Power window master switch | 30 |
| Power tailgate control unit | 31 |
| Gauge control module | 50 |
| Climate control unit / HVAC control unit | 51 |
| Automatic lighting control unit-sensor | 72 |
| Power seat control unit | 95 |
| Immobilizer-keyless control unit | 96 |
| Parking and back-up sensor control unit | 9A |
| Left side BSI radar unit | 9F |
| Front seat heater control unit | A2 |
| Right side BSI radar unit | A7 |
| Wireless charger | AF |
NOTE: You can also check B-CAN communication status by the following methods:
- The body control module 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
12. Clear the DTCs by pressing and holding the SEL/RESET knob 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 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 front individual map lights and the ceiling light. When the lights flash two times quickly and then go 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, and ceiling light blink once. If the circuit is faulty, there is no such indication.
- -
If the front individual map lights and ceiling light 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 and ceiling light 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 and ceiling light 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 | Ignition key switch |
| Front passenger's door switch | Turn signal switch (LEFT) |
| Left rear door switch | Turn signal switch (RIGHT) |
| Right rear door switch | Hazard warning switch |
| Tailgate latch switch | Headlight switch (ON) |
| Tailgate outer handle switch | Headlight switch (OFF) |
| Left rear door lock knob switch (UNLOCK) | Lighting switch |
| Right rear door lock knob switch (UNLOCK) | Passing switch |
| Windshield wiper HI/LO switch | Front fog light switch |
| Windshield wiper INT/LO switch | Park pin switch |
| Windshield wiper MIST switch | Brake pedal position switch |
| Windshield wiper intermittent dwell time controller | Back-up light switch |
| Windshield washer switch | Transmission range switch |
| Rear window wiper switch | Driver's door outer handle touch sensor |
| Rear window wiper INT switch | Front passenger's door outer handle touch sensor |
| Rear window washer switch | Driver's door outer handle lock switch |
| Electric parking brake switch | Front passenger's door outer handle lock switch |
| Hands free access power tailgate control unit/sensor | |
Relay Control Module
| Item | |
|---|---|
| Hood latch switch | |
Door Multiplex 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)* | Power window master switch(Left rear window UP, DOWN, AUTO) |
| Driver's door key cylinder switch (LOCK)* | |
| Driving position memory switch (SET) | Power window master switch(Right rear window UP, DOWN, AUTO) |
| Driving position memory switch (POSITION 1) | |
*: A second key is necessary to check the key cylinder inputs. Be sure to rotate the key cylinder switch two times to each position (lock and lock, unlock and unlock) to ensure the door lock knob switch is in the appropriate position.
| Item | |
|---|---|
| Driving position memory switch (POSITION 2) | |
*: A second key is necessary to check the key cylinder inputs. Be sure to rotate the key cylinder switch two times to each position (lock and lock, unlock and unlock) to ensure the door lock knob switch is in the appropriate position.
Gauge Control Module
| Item | |
|---|---|
| Electric parking brake/automatic brake hold switch | Audio remote-HFL switch |
| VSA OFF switch | Cruise control/ACC combination switch |
| TPMS switch | ECON switch |
| Brake fluid level switch | CMBS OFF switch |
| Washer fluid level switch | Idle stop OFF switch |