Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)

Shift to Test Mode 1

1.	Check the No. A21 (10 A) fuse in the under-hood fuse/relay box, and the No. B5 (7.5 A) fuse in the 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 ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

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 AUTO or OFF, then turn to the PARKING position, and turn to AUTO or OFF two more times.

7.	Release the combination light 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.

If the individual map lights keep blinking after entering Test Mode 1, check for B-CAN Unit communication errors.

Error	Display code (blinking pattern)
Error in the bus (bus off status)	1
Gauge control module communication error (AT frames cannot be received)	5

10.

Check for B-CAN DTCs indicated by the LCD display 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, press the engine start/stop button to select the OFF 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 control unit	15
Power window master switch	30
Gauge control module	50
Climate control unit	51
Automatic lighting control unit-sensor^*3	72
Automatic lighting/rain sensor^*4	74
Auto high-beam control unit	77
Keyless access control unit^*2	90
Power seat control unit	95
Immobilizer -keyless control unit^*1	96
Parking and back-up sensor control unit	9A
Wireless charger	AF

*1: Without keyless access system
*2: With keyless access system
*3: With automatic lighting without automatic wiper
*4: With automatic lighting and automatic wiper

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.

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 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 AUTO or OFF, then turn to the PARKING position, and turn to AUTO or 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)
Left rear door switch	Hazard warning switch
Right rear door switch	Headlight switch (ON)
Trunk lid latch switch	Headlight switch (OFF)
Audio switch	Lighting switch
Windshield wiper HI/LO switch	Dimmer switch
Windshield wiper INT/LO switch	Passing switch
Windshield wiper MIST switch	Fog light switch
Windshield wiper intermittent dwell time controller	Security hood switch
Windshield washer switch	Brake pedal position switch
Windshield wiper motor park position (Auto stop)	Transmission range switch (A/T)
Back-up light switch (M/T)	A/C switch
Trunk lid opener main switch	Ignition key switch

Door Multiplex Control Unit

Item
Driver's door lock switch (UNLOCK)	Power window master switch (Front passenger's window UP, DOWN)
Driver's door lock switch (LOCK)
Driver's door lock knob switch (UNLOCK)	Power window master switch (Left rear window UP, DOWN)
Driver's door lock knob switch (LOCK)	Power window master switch (Left rear window UP, DOWN)
Driver's door key cylinder switch (UNLOCK)^*	Power window master switch (Right rear window UP, DOWN)
Driver's door key cylinder switch (LOCK)^*	Power window master switch (Right rear window UP, DOWN)
Power window master switch (Driver's window UP, DOWN, AUTO)	Headlight switch (OFF)

*: 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
Cruise control main switch	PREVIOUS switch
Cruise control SET/- switch	NEXT switch
Cruise control RES/+ switch	Distance switch
Cruise control CANCEL switch	INFO switch
Parking brake switch	SEL/RESET knob
VSA OFF switch	SEL/RESET switch
LKAS switch	ECON switch
CMBS OFF switch	TPMS switch

Power Seat Control Unit

Item
Transmission range switch (P)	Front UP-DOWN switch (UP)
Slide switch (Forward)	Front UP-DOWN switch (Down)
Slide switch (Rearward)	Rear UP-DOWN switch (UP)
Recline switch (Forward)	Rear UP-DOWN switch (UP)
Recline switch (Rearward)