If the diagnosis
code No. U1190 is set, be sure to diagnose the CAN bus line.
Before replacing the ECU or sensor, ensure that the power supply circuit, the earth
circuit and the communication circuit are normal.
When the illuminated licence plate is installed, the sensors may not operate because
of noise from the plate. (When the ultrasonic noise is received, the bass toned buzzer sound
continuously. When the ultrasonic noise stops, the normal operation will be resumed immediately.)
DIAGNOSTIC FUNCTION
When the signals from the ETACS-ECU cannot be received, the corner sensor/back sensor-ECU
sets the diagnosis code No.U1190.
JUDGEMENT CRITERIA
Check Conditions
When all the following conditions are met.
Power supply mode: ON
ETACS-ECU system voltage is at 10 to 16 V.
Judgment Criterion
After the following condition is met, 5,000 ms or more have elapsed.
CAN signal from the ETACS-ECU cannot be received.
PROBABLE CAUSES
Malfunction of CAN bus line
Malfunction of ETACS-ECU
Malfunction of corner sensor/back sensor-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code
Check again if the diagnosis code is set to the ETACS-ECU.
Q.
Is the diagnosis code set?
Diagnose the ETACS-ECU (Refer to GROUP 54A, Troubleshooting ).
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check again if the diagnosis code is set to the SRS-ECU.
Q.
Is the diagnosis code set?
Replace the ETACS-ECU.
Go to Step 4.
STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set to the corner sensor/back sensor-ECU.
(1)Erase the diagnosis code.
(2)Turn the engine switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Replace the corner sensor/back sensor-ECU.
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to cope with Intermittent Malfunction ).
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting 
).