Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Distance Control Switch Circuit

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Engine & Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / Distance Control Switch Circuit

DESCRIPTION

The vehicle-to-vehicle distance control switch is used to set the distance for vehicle-to-vehicle distance control mode. The vehicle-to-vehicle distance control switch is installed in the steering pad switch assembly. The vehicle-to-vehicle distance set value can be changed by operating the vehicle-to-vehicle 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:

  • 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.

    Click here

  • When replacing the forward recognition camera, 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 and a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one, it is necessary to perform forward recognition camera adjustment.

    HINT:

    Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.

    One Time Recognition: Click here

    Sequential Recognition: Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(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

Vehicle-to-vehicle Distance Control Switch

Vehicle-to-vehicle distance control switch signal

OFF or ON

OFF: Vehicle-to-vehicle distance control switch not pushed

ON: Vehicle-to-vehicle distance control switch pushed

-
Powertrain > Radar Cruise2 > Data List

Tester Display

Vehicle-to-vehicle Distance Control Switch

OK:

The value of the Data List item changes according to the operation of the vehicle-to-vehicle 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.

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 - FORWARD RECOGNITION CAMERA AND BODY GROUND)

(a) Disconnect the U14 forward recognition camera connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J29-12 (DIST) - U14-3 (LKSW)

Always

Below 1 Ω

J29-2 (ECC) - Body ground

Always

Below 1 Ω

J29-12 (DIST) or U14-3 (LKSW) - Body ground

Always

10 kΩ or higher
OK

REPLACE FORWARD RECOGNITION CAMERA

NG

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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