PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM (for Gasoline Model (w/o Safe Exit Assist Function)): C1AC1; Master Module Horizontal Axis Misalignment; 2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM100000001D0NC
Model Year Start: 2019	Model: GR Corolla	Prod Date Range: [06/2018 - 09/2022]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM (for Gasoline Model (w/o Safe Exit Assist Function)): C1AC1; Master Module Horizontal Axis Misalignment; 2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022]

DTC

C1AC1

Master Module Horizontal Axis Misalignment

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.

HINT:

If a drum tester such as a speedometer tester, brake/speedometer combination tester or chassis dynamometer is used with the blind spot monitor system on, the blind spot monitor sensor may store this DTC by mistake.
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.

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.
If the bumper is damaged or the vehicle has a history of body repair, there is a possibility that the installation area of the blind spot monitor sensor may be deformed and the blind spot monitor sensor system may not operate correctly, so visually inspect the blind spot monitor sensor installation area (frame, stud bolt) to make sure it is not dented or bent.
Click here

If the visual inspection finds a problem, check the installation condition of the blind spot monitor sensor, and adjust the installation position of the blind spot monitor sensor as necessary.

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

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

END

REPLACE BLIND SPOT MONITOR SENSOR LH

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NOTICE:

Before replacing the blind spot monitor sensor LH, visually check for damage to the stud bolts or area surrounding the blind spot monitor sensor LH.

If there is any damage to the stud bolts or area surrounding the blind spot monitor sensor LH, perform Blind Spot Monitor Sensor Installation Condition Inspection and adjust according to the result.

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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.

4.	PERFORM BEAM AXIS CONFIRMATION

(a) Install the rear bumper.

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

END

REPLACE BLIND SPOT MONITOR SENSOR LH