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. A26, No C29 and the No. D4* fuses. Go to: Fuse To Components Index (With Auto Idle Stop System) (2019 2020 2021) or Fuse To Components Index (With Auto Idle Stop System) (2016 2017 2018) . If a fuse is blown, find and correct the cause, then replace the fuse.
*: With auto idle stop system
2. Turn OFF map lights if ON, and move the interior light switch to the DOOR position, and close all doors.
3. Turn the vehicle to the ON mode.
NOTE: Do steps 4-7 within 10 seconds after doing step 3.
4. Pull and hold the combination light 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 passing 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 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 MICU cannot receive signals from the door multiplex control unit. | 3 |
| The MICU 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 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.
NOTE: If the test times out, turn the vehicle to the OFF (LOCK) mode, and repeat steps 3-7.
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 |
|---|---|
| MICU | 10 |
| Power window master switch | 30 |
| Power tailgate control unit | 31 |
| Gauge control module | 50 |
| Climate control unit | 51 |
| HVAC control unit | 51 |
| Automatic lighting control unit-sensor | 72 |
| Automatic lighting/rain sensor | 74 |
| Headlight leveling control unit | 75 |
| Keyless access/TPMS control unit | 90 |
| Telematics control unit | 91 |
| Power seat control unit | 95 |
| Parking and back-up sensor control unit | 9A |
| 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 |
| Multipurpose camera unit | BO |
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 - Refer to:
Gauges Control Module Self-Diagnostic Function (2016 2017 2018) or
Gauges Control Module Self-Diagnostic Function (2019 2020 2021) .
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
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.
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 individual map lights. When the lights flash two times quickly and then go 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 blink once. If the circuit is faulty, there is no such indication.
- If the front individual map lights does not blink even when a switch is operated, check two or three other circuits listed in the table. If the front individual map lights blinks for each circuit, the additional circuits are OK; repair the short or open circuit that failed the test in step 18.
- If the front individual map lights does 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.
MICU
| Item | |
|---|---|
| Driver's door switch | Turn signal switch (LEFT) |
| Front passenger's door switch | Turn signal switch (RIGHT) |
| Left rear door switch | Hazard warning switch |
| Right rear door switch | Headlight switch (ON) |
| Tailgate latch switch and tailgate outer handle switch | Headlight switch (OFF) |
| Left rear door lock knob switch (UNLOCK) | Front fog light switch |
| Right rear door lock knob switch (UNLOCK) | Lighting switch |
| Windshield wiper HI/LO switch | Dimmer switch |
| Windshield wiper INT/LO switch | Passing switch |
| Windshield wiper MIST switch | Windshield wiper motor park position (Auto stop) |
| Windshield wiper intermittent dwell time controller | Transmission range switch |
| Windshield washer switch | Rear window wiper motor park position (Auto stop) |
| Rear window wiper switch | Left one-touch access switch (Seat cushion side) |
| Rear window wiper INT switch | Left one-touch access switch (Seat-back side) |
| Rear washer switch | Right one-touch access switch (Seat cushion side) |
| Security hood switch | Right one-touch access switch (Seat-back side) |
| Brake pedal position 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) |
| Driver's door lock knob switch (LOCK) | |
| Driver's door key cylinder switch (UNLOCK) * | Power window master switch (Left rear window UP, DOWN) |
| Driver's door key cylinder switch (LOCK) * | |
| Driving position memory switch (SET) | Power window master switch (Right rear window UP, DOWN) |
| Driving position memory switch (POSITION 1) | |
| Driving position memory switch (POSITION 2) | Fuel fill door opener switch |
*: Be sure to rotate the door key cylinder switch two times to the desired test position (lock and lock, or unlock and unlock). This ensures the door lock knob switch will no longer report in that appropriate position, during door key cylinder switch test on third rotation.
Gauge Control Module
| Item | |
|---|---|
| LKAS switch | Parking brake switch |
| VSA OFF switch | Audio remote-HFL switch |
| Select/reset/information switch | CMBS OFF switch |
| ACC/cruise control combination switch | Dashlights brightness control switch |
| Intelligent traction management switch | ECON switch |
| Idle stop OFF switch | Brake fluid level switch |
| Washer fluid level switch | Snow switch |
Power Seat Control Unit
| Item | |
|---|---|
| Driver's slide switch (Forward) | Driver's front UP-DOWN switch (UP) |
| Driver's slide switch (Backward) | Driver's front UP-DOWN switch (DOWN) |
| Driver's recline switch (Forward) | Driver's rear UP-DOWN switch (UP) |
| Driver's recline switch (Backward) | Driver's rear UP-DOWN switch (DOWN) |
Keyless Access/TPMS Control Unit
| Item | |
|---|---|
| Driver's door touch sensor | Front passenger's door touch sensor |
| Driver's door outer handle lock switch | Front passenger's door outer handle lock switch |