Lexus NX: Steering Pad Switch Circuit

DESCRIPTION

The forward recognition camera receives the LTA/LDA main switch on/off signal from the steering pad switch assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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.).

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PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Chassis / Lane Control / Data List.

Chassis > Lane Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

LDA Control

A lane tracing assist system shows whether possibility is in control state

Permission / suppression

Prohibition: A lane tracing assistant player is impossible of system control

Permission: Lane tracing assist system control is possible

-

Chassis > Lane Control > Data List

Tester Display

LDA Control

(e) Read the Data List according to the display on the Techstream.

Result

Proceed to

The value of each Data List item changes according to the operation of the LTA/LDA main switch.

A

The value of each Data List item does not change according to the operation of the LTA/LDA main switch.

B

A

TO THE NEXT CHECK CIRCUIT SHOWN IN THE PROBREM SYMPTOMS TABLE

B

2.

INSPECT STEERING PAD SWITCH ASSEMBLY

(a) Remove the steering pad switch assembly.

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(b) Inspect the steering pad switch assembly.

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NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

3.

INSPECT SPIRAL CABLE SUB-ASSEMBLY

(a) Remove the spiral cable sub-assembly.

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(b) Inspect the spiral cable sub-assembly.

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NG

REPLACE SPIRAL CABLE SUB-ASSEMBLY

OK

4.

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

(a) Disconnect the I4 spiral cable sub-assembly connector.

(b) Disconnect the T18 forward recognition camera connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I4-12 (DIST) - T18-3 (LKSW)

Always

Below 1 Ω

I4-12 (DIST) or T18-3 (LKSW) - Body Ground

Always

10 kΩ higher

(d) Connect the I4 spiral cable sub-assembly connector.

(e) Connect the T18 forward recognition camera connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND)

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

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I4-2 (ECC) - Body ground

Always

Below 1 Ω

(c) Connect the spiral cable sub-assembly connector.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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