Lexus NX: 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.
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- 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.
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When the forward recognition camera is replaced with a new one or the windshield glass is replaced or removed/installed, make sure to perform beam axis adjustment for the forward recognition camera and clear the vehicle control history for each system.
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 power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Radar Cruise2 / 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 | ON or OFF | ON: Vehicle-to-vehicle distance control switch pushed OFF: Vehicle-to-vehicle distance control switch not pushed | - |
| 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 | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
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| 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 |
|
| 3. | 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 |
|
| 4. | CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA) |
(a) Disconnect the I4 spiral cable sub-assembly connector.
(b) Disconnect the T18 forward recognition camera connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I4-12 (DIST) - T18-3 (LKSW) | Always | Below 1 Ω |
| I4-12 (DIST) or T18-3 (LKSW) - Body ground | Always | 10 kΩ or higher |
(d) Connect the T18 forward recognition camera connector.
(e) Connect the I4 spiral cable sub-assembly connector.
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND) |
(a) Disconnect the I4 spiral cable sub-assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I4-2 (ECC) - Body ground | Always | Below 1 Ω |
(c) Connect the I4 spiral cable sub-assembly connector.
| OK | | USE SIMULATION METHOD TO CHECK |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Chassis / Parking Assist Camera / Trouble Codes. Chassis > Parking Assist Camera > Trouble Codes (e) Enter the following menus: Body
