TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-16
STEP 2. M.U.T.-III other system diagnosis code
Check whether the audio-related diagnosis code is
set.
Q: Is the diagnosis code set?
YES :
Diagnose the power gate. Refer to .
NO :
Go to Step 3
STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN
communication-linked systems below, is set.
• ETACS-ECU
U0230: Power Gate CAN timeout
Q: Is the diagnosis code set?
YES :
Go to Step 4
NO :
Go to Step 5
STEP 4. Check whether the diagnosis code is
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) to ON
(3) Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the electric tailgate, and then go to
Step 6.
NO :
A poor connection, open circuit or other
intermittent malfunction in the CAN bus line
between the electric tailgate and the heater
controller assembly (A/C-ECU) (Refer to
GROUP 00
− How to Cope with Intermittent
Malfunction ).
STEP 5. Check whether the diagnosis code is
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) to ON
(3) Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the heater controller assembly
(A/C-ECU), and then go to Step 6.
NO :
A poor connection, open circuit or other
intermittent malfunction in the CAN bus line
between the electric tailgate and the heater
controller assembly (A/C-ECU) (Refer to
GROUP 00
− How to Cope with Intermittent
Malfunction ).
STEP 6. Check whether the diagnosis code is
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) to ON
(3) Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Return to Step 1.
NO :
The procedure is complete.
Code No. U0245: ANDCAN time-out
CAUTION
If diagnosis code No.U0245 is set in the heater
controller assembly (A/C-ECU), diagnose the
CAN main bus line.
CAUTION
Whenever the ECU is replaced, ensure that the
communication circuit is normal.
TROUBLE JUDGMENT
The heater controller assembly (A/C-ECU) receives
air conditioner control-related signals from the com-
bination meter or CAN box unit (MMCS) via the CAN
bus lines. If the ECU cannot receive any of the air
conditioner control-related signals from the combina-
tion meter or CAN box unit (MMCS), diagnosis code
U0245 will be stored.
COMMENTS ON TROUBLE SYMPTOM
Current trouble
• Connector(s) or wiring harness in the CAN bus
lines between the combination meter or CAN box
unit (MMCS) and the heater controller assembly
(A/C-ECU), the power supply system to the com-
bination meter or CAN box unit (MMCS), the
combination meter or CAN box unit (MMCS)
itself, or the heater controller assembly
(A/C-ECU) may be defective.