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

-

Powertrain > Radar Cruise1 > Data List

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

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT CRUISE CONTROL MAIN SWITCH

(a) Remove the cruise control main switch.

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(b) Inspect the cruise control main switch.

Click here

NG

REPLACE CRUISE CONTROL MAIN SWITCH

OK

3.

CHECK CRUISE CONTROL SWITCH WIRE (STEERING PAD SWITCH ASSEMBLY)

(a) Remove the cruise control switch wire (steering pad switch assembly)

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*a

Front view of wire harness connector

(to Spiral Cable Sub-assembly)

*b

Front view of wire harness connector

(to Cruise Control Main Switch (Steering Pad Switch Assembly))

(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)

OK

4.

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

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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