Toyota Avalon Service & Repair Manual: Steering Pad Switch Circuit

Toyota Avalon Service & Repair Manual / Engine / Cruise Control / Lane Departure Alert System (w/ Steering Control)(for Gasoline Model) / Steering Pad Switch Circuit

DESCRIPTION

The driving support ECU assembly receives a lane departure alert switch signal from the steering pad switch assembly and sends the signal to the forward recognition camera via CAN communication.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

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PROCEDURE

1.

READ VALUE USING TECHSTREAM (CAN BUS CHECK)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: System Select / Can Bus Check.

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CAN Bus Check

Result

Proceed to

All of the ECUs and sensors that are currently connected to the CAN communication system are displayed

A

None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed

B
B

GO TO CAN COMMUNICATION SYSTEM

A

2.

CHECK FOR DTCs (HEALTH CHECK)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: System Select / Health Check.

(e) Check DTCs.

(f) Turn the engine switch off.

Result

Proceed to

No DTCs are output.

A

DTCs are output.

B
B

GO TO DTC CHART
A

3.

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

4.

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

5.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - DRIVING SUPPORT ECU ASSEMBLY)

(a) Disconnect the G17 spiral cable sub-assembly connector.

(b) Disconnect the G39 driving support ECU assembly connector.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

G17-6 (DIST) - G39-23 (SPSW)

Always

Below 1 Ω

G17-2 (ECC) - Body ground

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

G17-6 (DIST) or G39-23 (SPSW) - Body ground

Always

10 kΩ or higher

(d) Connect the G39 driving support ECU assembly connector.

(e) Connect the G17 spiral cable sub-assembly connector.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Problem Symptoms Table

    System Diagram

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