CRUISE CONTROL: DYNAMIC LASER CRUISE CONTROL SYSTEM: DESCRIPTION (2008 Sequoia)

Last Modified: 11-29-2007		1.6 C
Service Category: Engine/Hybrid System	Section: Cruise Control
Model Year: 2008	Model: Sequoia	Doc ID: RM000000ZJX014X
Title: CRUISE CONTROL: DYNAMIC LASER CRUISE CONTROL SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

U0235

Lost Communication with Cruise Control Front Distance Range Sensor

DTC

U1102

Lost Communication with Radar Sensor

DESCRIPTION

The laser radar sensor and distance control ECU transmit the data for general vehicle control and diagnosis function along the communication line. The laser radar sensor transmits information about the vehicle in front to the distance control ECU.

DTC No.	DTC Detection Condition	Trouble Area
U0235	The ECM detects a communication error signal (from the laser radar sensor to the distance control ECU) for 0.15 seconds or more while the dynamic laser cruise control is in operation.	Communication circuit Laser radar sensor Distance control ECU
U1102	The ECM detects a communication error signal (from the distance control ECU to the laser radar sensor) for 0.15 seconds or more while the dynamic laser cruise control is in operation	Communication circuit laser radar sensor Distance control ECU

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When the distance control ECU is replaced with a new one, initialization must be performed .
When the laser radar sensor is replaced with a new one, adjustment of the laser radar sensor beam axis must be performed .

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - LASER RADAR SENSOR)

(a) Disconnect the A43 distance control ECU connector and A26 laser radar sensor connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A43-22 (LRDD) - A26-3 (LRDD)	Always	Below 1 Ω
A43-13 (IGB) - A26-5 (IGB)	Always	Below 1 Ω
A43-22 (LRDD) - Body ground	Always	10 kΩ or higher
A43-13 (IGB) - Body ground	Always	10 kΩ or higher

2.	INSPECT DISTANCE CONTROL ECU

(a) Disconnect the A43 distance control ECU connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A43-13 (IGB) - Body ground	Ignition switch ON	11 to 14 V
A43-22 (LRDD) - A43-10 (SGND)	Ignition switch ON	4.5 to 5.5 V

3.	REPLACE LASER RADAR SENSOR

(a) Temporarily replace the laser radar sensor with a new or normally functioning one .

4.	ADJUST LASER RADAR SENSOR

(a) Adjust laser radar sensor .

HINT:

It is necessary to make the ECM recognize specification information (whether the vehicle is equipped with the dynamic laser cruise control system or not). When this procedure has not been carried out, this DTC may be output.

CLEAR DTC

(a) Clear the DTC .

6.	CHECK FOR DTC

(a) Reproduce the DTC detection conditions under which the DTC is stored.

HINT:

If the DTC detection conditions are not correct, the system will not detect the trouble.

(b) Drive the vehicle at a speed of 45 km/h (28 mph) or more and turn the cruise control main switch ON. Push the -SET switch to activate the cruise control system.

OK:

DTC is not output