Toyota Tundra Service Manual: Distance Control Switch Circuit

DESCRIPTION

The distance control switch is used to set the distance for vehicle-to-vehicle distance control mode. The distance control switch is installed in the steering pad switch assembly. The vehicle-to-vehicle distance set value can be changed by operating the steering pad switch assembly (distance control switch) while the dynamic radar cruise control system is controlling vehicle speed in vehicle-to-vehicle distance control mode.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the ECM, refer to Registration.

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  • 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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  • 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. As a result, a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one, be sure to perform Forward Recognition Camera Learning.

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PROCEDURE

1.

READ VALUE ON TECHSTREAM (DISTANCE CONTROL SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Radar Cruise 2 / Data List.

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

Powertrain > Radar Cruise2 > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Distance Control Switch

Distance control switch signal

ON or OFF

ON: Distance control switch on

OFF: Distance control switch off

-

OK:

The Data List item shown in the table changes according to the operation of the steering pad switch assembly (distance control switch).

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.

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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 WITH SENSOR SUB-ASSEMBLY

(a) Remove the spiral cable with sensor sub-assembly.

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(b) Inspect the spiral cable with sensor sub-assembly.

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NG

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

OK

4.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA, ECM AND BODY GROUND)

(a) Disconnect the J45 spiral cable with sensor sub-assembly connector.

(b) Disconnect the W9 forward recognition camera connector.

(c) Disconnect the A24 ECM connector.

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

Standard Resistance (for 1UR-FE):

Tester Connection

Condition

Specified Condition

J45-11 (DIST) - W9-3 (LKSW)

Always

Below 1 Ω

J45-2 (ECC) - Body ground

Always

Below 1 Ω

J45-11 (DIST) or W9-3 (LKSW) - Body ground

Always

10 kΩ or higher

Standard Resistance (for 3UR-FE, 3UR-FBE):

Tester Connection

Condition

Specified Condition

J45-11 (DIST) - W9-3 (LKSW)

Always

Below 1 Ω

J45-2 (ECC) - A24-59 (ECCS)

Always

Below 1 Ω

J45-11 (DIST) or W9-3 (LKSW) - Body ground

Always

10 kΩ or higher

J45-2 (ECC) or A24-59 (ECCS) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

(a) for 1UR-FE:

Disconnect the J45 spiral cable with sensor sub-assembly connector.

(b) for 3UR-FE, 3UR-FBE:

Disconnect the D74 ECM connector.

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

Standard Resistance (for 1UR-FE):

Tester Connection

Condition

Specified Condition

J45-2 (ECC) - Body ground

Always

Below 1 Ω

Standard Resistance (for 3UR-FE, 3UR-FBE):

Tester Connection

Condition

Specified Condition

D74-81 (E1) - Body ground

Always

Below 1 Ω

Result

Proceed to

OK (for 3UR-FE, 3UR-FBE)

A

OK (for 1UR-FE)

B

NG

C

B

REPLACE FORWARD RECOGNITION CAMERA

C

REPAIR OR REPLACE HARNESS OR CONNECTOR

A

6.

CHECK ECM (ECM TERMINALS)

(a) Disconnect the A24 and D74 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A24-59 (ECCS) - D74-81 (E1)

Always

Below 1 Ω

OK

REPLACE FORWARD RECOGNITION CAMERA

NG

REPLACE ECM

    Diagnostic Trouble Code Chart

    Dtc Check / Clear

    See More:

    Toyota Tundra Service Manual > Forward Recognition Camera System: Front Radar Sensor Region Code Mismatch (C1A0A)
    DESCRIPTION The forward recognition camera receives necessary information from the millimeter wave radar sensor assembly. When the forward recognition camera judges that a millimeter wave radar sensor assembly which is not compatible with the vehicle has been installed, DTC C1A0A is stored. DTC No. ...

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