Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Steering Pad Switch Circuit

DESCRIPTION

  • The steering pad switch assembly outputs the on/off signal and various control signals to the hybrid vehicle control ECU.
  • The hybrid vehicle control ECU performs cruise control according to the signals received from the steering pad switch assembly.

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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  • Before replacing the hybrid vehicle control ECU, refer to Registration.

    Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

*1

Steering Pad Switch Assembly

*a

Cruise Control Main Switch

*b

-SET Switch

*c

+RES Switch

*d

CANCEL Switch

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

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Radar Cruise 1 / Data List.

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

Powertrain > Radar Cruise1 > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Cancel Switch

CANCEL switch status

ON or OFF

ON: CANCEL switch pushed

OFF: CANCEL switch not pushed

-

-SET Switch

-SET switch status

ON or OFF

ON: -SET switch pushed

OFF: -SET switch not pushed

-

+RES Switch

+RES switch status

ON or OFF

ON: +RES switch pushed

OFF: +RES switch not pushed

-

Cruise Main Switch Operation Condition

Cruise control main switch status

ON or OFF

ON: Cruise control main switch pushed

OFF: Cruise control main switch not pushed

-

Powertrain > Radar Cruise1 > Data List

Tester Display

Cancel Switch

-SET Switch

+RES Switch

Cruise Main Switch Operation Condition

OK:

The value of each measurement item changes according to the operation of the steering pad switch assembly.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT STEERING PAD SWITCH ASSEMBLY

(a) Remove the steering pad switch assembly.

Click here

(b) Inspect the steering pad switch assembly.

Click here

NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

3.

INSPECT SPIRAL CABLE SUB-ASSEMBLY

(a) Remove the spiral cable sub-assembly.

Click here

(b) Inspect the spiral cable sub-assembly.

Click here

NG

REPLACE SPIRAL CABLE SUB-ASSEMBLY

OK

4.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - HYBRID VEHICLE CONTROL ECU AND BODY GROUND)

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

(b) Disconnect the G46 hybrid vehicle control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G17-13 (CCS) - G46-28 (CCS)

Always

Below 1 Ω

G17-2 (ECC) - Body ground

Always

Below 1 Ω

G17-13 (CCS) or G46-28 (CCS) - Body ground

Always

10 kΩ or higher

(d) Connect the G46 hybrid vehicle control ECU connector.

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

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Road Test

    System Diagram

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