Lexus NX: Cruise Control Switch Circuit
DESCRIPTION
- The cruise control main switch outputs the cruise control power supply switch signal and each operation switch signal to the hybrid vehicle control ECU.
- The hybrid vehicle control ECU performs cruise control according to the signal from the cruise control main switch.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Before replacing the hybrid vehicle control ECU, 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 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 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 on OFF: CANCEL switch off | - |
| -SET Switch | -SET switch status | ON or OFF | ON: -SET switch on OFF: -SET switch off | - |
| +RES Switch | +RES switch status | ON or OFF | ON: +RES switch on OFF: +RES switch off | - |
| Cruise Ready Main-CPU | Cruise control system standby condition | ON or OFF | ON: Cruise control main switch (ON-OFF) on OFF: Cruise control main switch (ON-OFF) off | - |
| Cruise Ready Sub-CPU | Cruise control system standby condition | ON or OFF | ON: Cruise control main switch (ON-OFF) on OFF: Cruise control main switch (ON-OFF) off | - |
| Tester Display |
|---|
| Cancel Switch |
| -SET Switch |
| +RES Switch |
| Cruise Ready Main-CPU |
| Cruise Ready Sub-CPU |
OK:
The value of each Data List item changes according to the operation of the cruise control main switch.
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
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| 2. | INSPECT CRUISE CONTROL MAIN SWITCH |
(a) Remove the cruise control main switch.
Click here
(b) Inspect the cruise control main switch.
Click here
| NG | | REPLACE CRUISE CONTROL MAIN SWITCH |
|
| 3. | CHECK CRUISE CONTROL SWITCH WIRE (STEERING PAD SWITCH ASSEMBLY) |
| (a) Remove the cruise control switch wire (steering pad switch assembly) Click here |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| z3-12 - z17-3 | Always | Below 1 Ω |
| z3-7 - z17-1 | Always | Below 1 Ω |
| z3-12 or z17-3 - Body ground | Always | 10 kΩ or higher |
| z3-7 or z17-1 - Body ground | Always | 10 kΩ or higher |
| NG | | REPLACE CRUISE CONTROL SWITCH WIRE (STEERING PAD SWITCH ASSEMBLY) |
|
| 4. | INSPECT SPIRAL CABLE SUB-ASSEMBLY |
(a) Remove the spiral cable sub-assembly.
Click here
(b) Inspect the spiral cable sub-assembly.
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| NG | | REPLACE SPIRAL CABLE SUB-ASSEMBLY |
|
| 5. | CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - HYBRID VEHICLE CONTROL ECU and BODY GROUND) |
(a) Disconnect the I4 spiral cable sub-assembly connector.
(b) Disconnect the A35 hybrid vehicle control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I4-7 (CCS) - A35-55 (CCS) | Always | Below 1 Ω |
| I4-2 (ECC) - Body ground | Always | Below 1 Ω |
| I4-7 (CCS) or A35-55 (CCS) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE HYBRID VEHICLE CONTROL ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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