Toyota CH-R Service Manual: Slave Module Horizontal Axis Misalignment (C1AC2)

Toyota CH-R Service Manual / Park Assist / Monitoring / Blind Spot Monitor System / Slave Module Horizontal Axis Misalignment (C1AC2)

DESCRIPTION

This DTC is stored when the angle of the blind spot monitor sensor RH (Slave) 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
C1AC2	Slave 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 RH (Slave)

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 Slave > Utility

Tester Display
BSM Slave Beam Axis Display

Body Electrical > Blind Spot Monitor Slave > Utility

Tester Display
BSM Slave Beam Axis Adjustment

END

REPLACE BLIND SPOT MONITOR SENSOR RH (SLAVE)

3.	CHECK INSTALLATION CONDITION

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

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 Slave > Utility

Tester Display
BSM Slave Beam Axis Display

Body Electrical > Blind Spot Monitor Slave > Utility

Tester Display
BSM Slave Beam Axis Adjustment

END

REPLACE BLIND SPOT MONITOR SENSOR RH (SLAVE)

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART Blind Spot Monitor System DTC No. Detection Item Link C1A45 Vehicle Speed Sensor ...

Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129,U0142)

DESCRIPTION These DTCs are stored if there is a malfunction in the CAN communication system connected to the blind spot monitor sensor. HINT: If CAN communication system DTCs are stored, they may ...

Other materials:

Toyota CH-R Service Manual > Meter / Gauge System: System Diagram
SYSTEM DIAGRAM HINT: Inspect the communication function by CAN communication system. Click here ...

Toyota CH-R Service Manual > Meter / Gauge System: Parts Location
PARTS LOCATION ILLUSTRATION *A w/ Toyota Safety Sense P *B for LED Headlight *1 THERMISTOR ASSEMBLY (AMBIENT TEMPERATURE SENSOR) *2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) *3 ...

Toyota CH-R Service Manual: Slave Module Horizontal Axis Misalignment (C1AC2)

Diagnostic Trouble Code Chart

Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129,U0142)

Other materials:

Toyota C-HR (AX20) 2023-2026 Owner's Manual

Toyota CH-R Owners Manual

Toyota CH-R Service Manual