Toyota Yaris: Lane Tracing Assist System / Steering Pad Switch Circuit

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Engine & Hybrid System / Cruise Control / Lane Tracing Assist System / Steering Pad Switch Circuit

DESCRIPTION

The forward recognition camera receives LTA main switch signals from the steering pad switch assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle and a DTC may be stored.
When the forward recognition camera is replaced with a new one or the windshield glass is replaced or removed/installed, make sure to read Before Starting Adjustment, then perform optical axis alignment for the forward recognition camera and clear the vehicle control history for each system.
HINT:

Forward recognition camera axis alignment can be performed by using either One Time Recognition, Sequential Recognition or Driving Adjustment.

One time recognition: Click here

Sequential recognition: Click here

Driving Adjustment: Click here
During the steering pad switch assembly check, check the precautions for the airbag system since the horn button assembly is removed during servicing. (installation/removal of parts, checks, replacement, etc.)
Click here

PROCEDURE

1.	READ VALUE USING GTS (LDA CONTROL)

(a) Read the Data List according to the display on the GTS.

Chassis > Lane Control > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
LDA Control	Whether lane tracing assist system control is permitted or not	Prohibit or Permit	Prohibit: Lane tracing assist system control not possible Permit: Lane tracing assist system control possible	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

LDA Control

Whether lane tracing assist system control is permitted or not

Prohibit or Permit

Prohibit: Lane tracing assist system control not possible

Permit: Lane tracing assist system control possible

Chassis > Lane Control > Data List

Tester Display
LDA Control

Result	Proceed to
Data List value changes when LTA Main Switch is operated	A
Data List value does not change when LTA Main Switch is operated	B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT STEERING PAD SWITCH ASSEMBLY

Click here

REPLACE STEERING PAD SWITCH ASSEMBLY

3.	INSPECT SPIRAL CABLE SUB-ASSEMBLY

Click here

REPLACE SPIRAL CABLE SUB-ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA)

(a) Disconnect the H60 spiral cable sub-assembly connector.

(b) Disconnect the V10 forward recognition camera connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
H60-6 (DIST) - V10-3 (LKSW)	Always	Below 1 Ω
H60-6 (DIST) or V10-3 (LKSW) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - ECM)

(a) Disconnect the H60 spiral cable sub-assembly connector.

(b) Disconnect the A106 ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
H60-2 (ECC) - A106-28 (ECCS)	Always	Below 1 Ω
H60-2 (ECC) or A106-28 (ECCS) - Body ground	Always	10 kΩ or higher

REPLACE FORWARD RECOGNITION CAMERA

REPAIR OR REPLACE HARNESS OR CONNECTOR

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