CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 J
Service Category: Engine/Hybrid System	Section: Cruise Control
Model Year: 2008	Model: LX570	Doc ID: RM000003FEE000X
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DESCRIPTION (2008 LX570)

Distance Control Switch Circuit

DESCRIPTION

The distance control switch sets the vehicle-to-vehicle distance control mode. The distance control switch is installed in the steering pad switch. The vehicle-to-vehicle distance set value can be changed by operating the steering pad switch (distance control switch) while the dynamic radar cruise control system is in operation. The steering pad switch uses the CAN communication line to communicate with each ECU.

WIRING DIAGRAM

INSPECTION PROCEDURE

CAUTION:

The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the Precaution for the SRS .

NOTICE:

When the distance control ECU is replaced with a new one, initialization must be performed .

PROCEDURE

1.	READ VALUE USING TECHSTREAM (VEHICLE DISTANCE)

(a) Using the Techstream, read the Data List.

Radar Cruise

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Car Dist Time Setting

Vehicle distance time setting condition /

SHORT, LONG, MID or NO

Vehicle distance selected by steering pad switch (distance control switch)

OK:

Normal conditions listed above are displayed.

2.	CHECK NO. 1 SWITCH WIRE

(a) Disconnect the z35 and z51 No. 1 switch wire connectors.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
z35-4 (DIST) - z51-2 (DIST)	Always	Below 1 Ω
z35-6 (ECC) - z51-10 (ECC)	Always	Below 1 Ω

3.	INSPECT STEERING PAD SWITCH

(a) Disconnect the z35 steering pad switch connector from the spiral cable.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
z35-4 (DIST) - z35-6 (ECC)	Distance control switch on (pushed)	Below 1 Ω
z35-4 (DIST) - z35-6 (ECC)	Distance control switch off (pushed again)	1 MΩ or higher

4.	INSPECT SPIRAL CABLE

(a) Check the spiral cable and connector for scratches, cracks, dents and chips. If any defects are found, replace the spiral cable with a new one.

(b) Check the spiral cable.

(1) Set the spiral cable to the center position .

(2) After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise, and measure the resistance according to the value(s) in the table below. Then rotate the spiral cable 5 times counterclockwise, and measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
z35-4 (DIST) - E12-11 (DIST)	Always	Below 1 Ω
z35-6 (ECC) - E12-2 (ECC)	Always	Below 1 Ω

(3) After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise. Then while rotating the spiral cable 5 times counterclockwise, measure the resistance according to the value(s) in the table below.

NOTICE:

As the spiral cable may break, do not rotate the spiral cable more than the specified amount.

Standard Resistance:

Tester Connection	Condition	Specified Condition
z35-4 (DIST) - E12-11 (DIST)	Always	Below 1 Ω
z35-6 (ECC) - E12-2 (ECC)	Always	Below 1 Ω

5.	CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - DISTANCE CONTROL ECU AND BODY GROUND)

(a) Disconnect the E86 distance control ECU connector.

(b) Disconnect the E12 spiral cable connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
E12-2 (ECC) - Body ground	Always	Below 1 Ω
E12-11 (DIST) - E86-16 (MODE)	Always	Below 1 Ω
E12-11 (DIST) - Body ground	Always	10 kΩ or higher