Toyota Yaris: Dynamic Radar Cruise Control System / Steering Pad Switch Circuit

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / Steering Pad Switch Circuit

DESCRIPTION

  • The steering pad switch assembly outputs the dynamic cruise control on/off signal and various control signals to the ECM.
  • The ECM controls the dynamic cruise control system according to the signals received from the steering pad switch assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the ECM, refer to Service Bulletin.
  • 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 GTS

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

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 Data List 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

Click here

NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

3.

INSPECT SPIRAL CABLE SUB-ASSEMBLY

Click here

NG

REPLACE SPIRAL CABLE SUB-ASSEMBLY

OK

4.

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

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

(b) Disconnect the A106 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A106-27 (CCS) - H60-13 (CCS)

Always

Below 1 Ω

A106-28 (ECCS) - H60-2 (ECC)

Always

Below 1 Ω

A106-27 (CCS) or H60-13 (CCS) - Body ground

Always

10 kΩ or higher

A106-28 (ECCS) or H60-2 (ECC) - Body ground

Always

10 kΩ or higher

(d) Connect the A106 ECM connector.

(e) Connect the H60 spiral cable sub-assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

(a) Disconnect the A106 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A106-10 (E1) - Body ground

Always

Below 1 Ω

(c) Connect the A106 ECM connector.

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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