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 the PCM or F-CAN loss of communication errors first, then do this diagnosis if the HDS is not available.

1.
Check the No. B29 fuse and the No. C34 fuse. If a fuse is blown, find and correct the cause, then replace the fuse.

2.
Move the interior light switch to the MIDDLE 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 combination light 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 to the PARKING position, and turn to OFF two more times.

7.
Release the combination light switch.

8.
Wait 5 seconds, and watch the ceiling light. When the ceiling light flashes quickly once, the system enters in Test Mode 1.

9.
If the ceiling light keeps blinking after entering Test Mode 1. Check for a B-CAN unit communication error.

Error
Display code (blinking pattern)
Communication bus line error (BUS OFF).
1
The MICU cannot receive signals from the gauge control module.
5

10.
Check for B-CAN DTCs indicated by the display in the gauge control module while still in Test Mode 1. Press the SEL/RESET knob 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.
Without Multi-Information Display

With Multi-Information Display

The control unit that has stored the code can be identified by the number shown below or after the DTC's code.

Control Unit
Control Unit I.D. Number
MICU
10
Gauge control module
50
Climate control unit
51
Automatic lighting control unit-sensor
74
Keyless access control unit
90
Immobilizer-keyless control unit
96
Multipurpose camera unit
B0

NOTE: You can also check the 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

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 in the 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 ceiling light. When the ceiling light flashes 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 ceiling light blinks once. If the circuit is faulty, there is no such indication.

?
If the ceiling light does not blink even when a switch is operated, check two or three other circuits listed in the table. If the ceiling light blinks for each circuit, the additional circuits are OK; repair the short or open circuit that failed the test in step 19.
?
If the ceiling light 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
Turn signal switch (LEFT)
Driver's door key cylinder switch (UNLOCK)*
Turn signal switch (RIGHT)
Driver's door key cylinder switch (LOCK)*
Hazard warning switch
Ignition key switch
Windshield wiper HI/LO switch
Headlight switch (ON)
Windshield wiper INT/LO switch
Headlight switch (OFF)
Windshield wiper MIST switch
Lighting switch
Windshield washer switch
Dimmer switch
Windshield wiper motor park position (Auto stop)
Passing switch
Rear window wiper switch
Fog light switch
Rear window wiper INT switch
Driver's door switch
Rear window washer switch
Front passenger's door switch
Driver's door lock switch (UNLOCK)
Left rear door switch
Driver's door lock switch (LOCK)
Right rear door switch
Driver's door lock knob switch (UNLOCK)
Tailgate latch switch
Driver's door lock knob switch (LOCK)
Security hood switch
Front passenger's door lock knob switch (UNLOCK)
Brake pedal position switch
Left rear door lock knob switch (UNLOCK)
A/C switch
Right rear door lock knob switch (UNLOCK)
Transmission range 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
ACC/cruise control combination switch
SEL/RESET knob
CMBS OFF switch
ECON switch
TPMS switch
Parking brake switch
VSA OFF switch