Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS) (2016)
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. C16 (10 A) fuse in the under-hood fuse/relay box, and the No. D11 (7.5 A) fuse in the driver's under-dash fuse/relay box. If a fuse is blown, find and correct the cause, then replace the fuse.
2. Move the interior light switch to the DOOR position, and close all doors
NOTE: 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 passing switch, turn the headlight switch to the PARKING position, then release, pull, and hold the passing switch in its PASSING position.
6. Turn the combination light switch to AUTO, then turn the headlight switch to the PARKING position, and turn the lights to AUTO two more times.
7. Release the passing switch.
8. Wait 5 seconds, and watch the front individual map lights and ceiling light. 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 relay control module. | 2 |
| The MICU cannot receive signals from the door multiplex control unit. | 3 |
| The MICU cannot receive signals from the gauge control module. | 5 |
| The MICU cannot receive signals from the rear MICU. | 7 |
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.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 |
| Relay control module | 11 |
| Rear MICU | 12 |
| Power window master switch | 30 |
| Power tailgate control unit | 31 |
| Gauge control module | 50 |
| Climate control unit | 51 |
| Automatic lighting/rain sensor | 74 |
| Headlight leveling control unit | 75 |
| Keyless access/TPMS control unit | 90 |
| Telematics control unit | 91 |
| HandsFreeLink control unit | 94 |
| Power seat control unit | 95 |
| Parking and back-up control unit | 9A |
| Multi view camera unit | 9C |
| Left side BSI radar unit | 9F |
| Front seat heater control unit | A2 |
| Right side BSI radar unit | A7 |
| Second row seat heater control unit | AC |
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 Self-Diagnostic Function (2014 2015), or Gauges Self-Diagnostic Function (2016), or Gauges Self-Diagnostic Function (2017 2018 2019 2020) .
11. Record all DTCs and sort them by DTC type, then troubleshoot them in this order:
- Battery voltage DTCs
- Internal error DTCs
- Loss of communication DTCs
- Signal error DTCs
12. Clear the DTCs by pressing and holding the TRIP 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 switch, turn the headlight switch to the PARKING position, then release, pull, and hold the combination switch in its Passing position.
16. Turn off the headlights, then turn the headlight switch to the PARKING position, and turn the lights ON and 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, 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 18.
- 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.
MICU
| Item | |
|---|---|
| Driver's door switch | Turn signal switch (LEFT) |
| Front passenger's door switch | Turn signal switch (RIGHT) |
| Transmission range switch | Hazard warning switch |
| Audio switch | Headlight switch (ON) |
| Windshield wiper HI/LO switch | Headlight switch (OFF) |
| Windshield wiper INT/LO switch | Lighting switch |
| Windshield wiper MIST switch | Dimmer switch |
| Windshield wiper intermittent dwell time controller | Passing switch |
| Windshield washer switch | Ignition key switch |
| Rear window wiper switch | Brake pedal position switch |
| Rear wiper intermittent dwell time controller | Headlight washer switch |
| Rear washer switch | Rear window defogger switch |
Rear MICU
| Item | |
|---|---|
| Left rear door switch | Left rear door lock knob switch (UNLOCK) |
| Right rear door switch | Right rear door lock knob switch (UNLOCK) |
| Full latch switch (closer unit) | |
Relay Control Module
| Item | |
|---|---|
| Security hood switch | A/C 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) | Driver's door power tailgate/fuel fill door opener switch |
*: 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 | |
|---|---|
| CMBS OFF switch | Idle stop OFF switch |
| ACC/Cruise control combination switch | LDW OFF switch |
| Audio remote/HFL-navigation voice control switch | TRIP switch |
| Right multi-function Steering Wheel Controller | Audio remote/HFL switch |
| Left multi-function Steering Wheel Controller | Integrated dynamics system switch |
| VSA OFF switch | |
Power Seat Control Unit
| Item | |
|---|---|
| Slide switch (Forward) | Front UP-DOWN switch (UP) |
| Slide switch (Rearward) | Front UP-DOWN switch (Down) |
| Recline switch (Forward) | Rear UP-DOWN switch (Up) |
| Recline switch (Rearward) | Rear UP-DOWN switch (Down) |