Before replacing
the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit
are normal.
DIAGNOSTIC FUNCTION
When the LDW-ECU has never initialised or fails to initialise its rain sensor, it will
store diagnosis code No. B1952.
note
This diagnosis code may be also stored if the LDW camera is not installed correctly. Prior
to the diagnosis, check whether the camera is installed correctly.
JUDGEMENT CRITERIA
When the LDW-ECU has never initialised or fails to initialise its rain sensor, it will
determine that the system is defective.
PROBABLE CAUSES
The LDW camera not initialised
Faults on the windshield glass (such as scratch, cracks, contamination or drain
drops on the glass surface)
The LDW camera incorrectly installed
Malfunction of the LDW-ECU (rain sensor)
DIAGNOSIS PROCEDURE
STEP 1. Check the camera mounted surface on the windshield.
Visually check the LDW camera mounted surface on the windshield for scratch, cracks, contamination
or drain drops.
Q.
Is the check result normal?
Go to Step 2.
Windshield glass replacement (Refer to GROUP 42A - Windshield Glass Removal and
Installation .)
STEP 2. Check whether the diagnosis code is reset.
Check if the diagnosis code No. B1952 is set to LDW-ECU.
(1)Initialise the LDW camera. (Refer to How to initialise the LDW camera ).
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
Windshield glass replacement (Refer to GROUP 42A - Windshield Glass Removal and
Installation 
.)