Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Master Module Horizontal Axis Misalignment (C1AC1)

DESCRIPTION

This DTC is stored when the angle of the blind spot monitor sensor LH deviates more than the allowable range from the horizontal axis.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1AC1	Master Module Horizontal Axis Misalignment	When the blind spot monitor sensor deviates 5 degrees or more from the horizontal axis when the system is activated	Blind spot monitor sensor LH

CAUTION / NOTICE / HINT

NOTICE:

When checking for DTCs, make sure that the blind spot monitor system is turned on.

PROCEDURE

1.	CHECK VEHICLE CONDITION

(a) Check the condition of the rear bumper around the blind spot monitor sensors.

HINT:

When mud, snow, ice, a sticker, etc. is covering the sensor or its surrounding area on the rear bumper, the blind spot monitor sensor may store this DTC by mistake.

Result	Proceed to
A sticker, mud, snow, ice, etc. is covering the sensor or surrounding area on the rear bumper.	A
There are scratches or dents on the rear bumper around the sensors.	B
No abnormalities.

B

GO TO STEP 3

A

2.	PERFORM BEAM AXIS CONFIRMATION

(a) Clean the rear bumper.

(b) Perform Blind Spot Monitor Beam Axis Confirmation using the Techstream.

Click here

Body Electrical > Blind Spot Monitor Master > Utility

Tester Display
BSM Master Beam Axis Display

Body Electrical > Blind Spot Monitor Master > Utility

Tester Display
BSM Master Beam Axis Adjustment

OK

END

NG

REPLACE BLIND SPOT MONITOR SENSOR LH

3.	CHECK INSTALLATION CONDITION

(a) Check the installation condition of the blind spot monitor sensor LH.

Click here

HINT:

Take the appropriate action in accordance with the result.

NEXT

4.	PERFORM BEAM AXIS CONFIRMATION

(a) Install the rear bumper.

REAR BUMPER (w/o Rear No. 2 Seat): Click here

REAR BUMPER (w/ Rear No. 2 Seat): Click here

(b) Perform Blind Spot Monitor Beam Axis Confirmation using the Techstream.

Click here

Body Electrical > Blind Spot Monitor Master > Utility

Tester Display
BSM Master Beam Axis Display

Body Electrical > Blind Spot Monitor Master > Utility

Tester Display
BSM Master Beam Axis Adjustment

OK

END

NG

REPLACE BLIND SPOT MONITOR SENSOR LH