Toyota RAV4 manuals

Toyota Sienna Service Manual: Laser Sensor Power Source Circuit

DESCRIPTION

This circuit provides power to the laser sensor. The laser sensor emits radio waves towards an object in front and measures the distance and direction of the object by receiving the beam reflections. Based on the reflections, the sensor calculates the difference in speed between the vehicle and the object in front.

This data is transmitted to the distance control ECU. The ECM recognizes the laser sensor via terminals LGND. If an open circuit occurs in the wire harness between terminals LGND, the ECM cannot recognize the laser sensor. The ECM will stop the control of the vehicle-to-vehicle distance control mode and only the constant speed control mode can be used.

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK DISTANCE CONTROL ECU (IGB VOLTAGE)

CHECK DISTANCE CONTROL ECU (IGB VOLTAGE)

  1. Disconnect the L1 laser sensor connector.
  2. Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

2 CHECK HARNESS AND CONNECTOR (LASER SENSOR - ECM AND BODY GROUND)

CHECK HARNESS AND CONNECTOR (LASER SENSOR - ECM AND BODY GROUND)

  1. Disconnect the E4 connector from the ECM.
  2. Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

3 CHECK HARNESS AND CONNECTOR (LASER SENSOR - DISTANCE CONTROL ECU)

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

  1. Disconnect the D2 distance control ECU connector.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

REPLACE DISTANCE CONTROL ECU

Distance Control Switch Circuit
DESCRIPTION The distance control switch sets the vehicle-to-vehicle distance mode. The distance control switch is installed in the steering pad switch. The vehicle-to-vehicle distance set value ...

Wiper Signal Circuit
DESCRIPTION The distance control ECU detects wiper operation. If the windshield wipers operate in the HI or LO mode, the cruise control is canceled and the warning sound "pong" is emitte ...

Other materials:

DTC check / clear
1. CHECK DTC  Connect the intelligent tester to the DLC3.  Connect the intelligent tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the Data Link Connector 3 (DLC3).  Turn the ignition switch to the ON posi ...

Installation
1. INSTALL DISTANCE CONTROL ECU ASSEMBLY  Using a torque wrench, install the bolt. Torque: 5 N*m (51 kgf*cm, 44 in.*lbf) NOTICE: Do not install the dropped or shocked distance control ECU assembly. 2. INITIALIZE DISTANCE CONTROL ECU NOTICE: After replacing the distance control ECU ...

MIL Circuit
DESCRIPTION The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the ignition switch is turned to the ON position, power is supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL. The MIL operation ...

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