Lexus ES: 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:
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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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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 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 | - |
| 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 | .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 - ECM AND BODY GROUND) |
(a) Disconnect the G20 spiral cable sub-assembly connector.
(b) Disconnect the A25 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G20-13 (CCS) - A25-41 (CCS) | Always | Below 1 Ω |
| G20-2 (ECC) - Body ground | Always | Below 1 Ω |
| G20-13 (CCS) or A25-41 (CCS) - Body ground | Always | 10 kΩ or higher |
(d) Connect the A25 ECM connector.
(e) Connect the G20 spiral cable sub-assembly connector.
| OK | | REPLACE ECM |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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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
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Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspect
Installation
INSTALLATION PROCEDURE 1. INSTALL HV FLOOR UNDER WIRE CAUTION: Be sure to wear insulated gloves. (a) Insert the HV floor under wire into the floor panel hole and engage the grommet. (b) Install 2 new clamps in the order shown in the illustration. (c) Install the nut.
