Code No. U1190 CAN failure detection control signal cannot be received
TROUBLE JUDGMENT
ETACS-ECU sends the diagnosis code (U code) detection permission or prohibition signal to each ECU connected to the CAN bus line. If the compressor & heater controller cannot receive the diagnosis code (U code) detection permission or prohibition signal for 5 seconds after turning the electric motor switch to ON position, the diagnosis code U1190 will be set.
PROBABLE CAUSES
Malfunction of the CAN bus line.
The ETACS-ECU may be defective
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 lines. (Refer to GROUP 54C - Troubleshooting . ) After repairing the CAN bus lines, go to STEP 3.
STEP 2. Check whether the diagnosis code is reset.
Check again if the diagnosis code is output to the compressor & heater controller.
(1)Erase the stored diagnosis code.
(2)Set the electric motor 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 ETACS-ECU, and then go to STEP 3.
The diagnosis is complete.
STEP 3. Check whether the diagnosis code is reset.
Check again if the diagnosis code is output to the compressor & heater controller.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting 
. ) After repairing the CAN bus lines, go to STEP 3.