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:

Reassembly
1. INSTALL GENERATOR ROTOR ASSEMBLY (a) Place the drive end frame on the clutch pulley. (b) Install the generator rotor assembly to the drive end frame. (c) Place a new generator washer on the generator rotor. 2. INSTALL GENERATOR COIL ASSEMBLY (a) Using a deep socket wrench (21 ...

Crankshaft position sensor
Components Removal 1. Remove compressor and magnetic clutch HINT: (See page AC-227 ) 2. REMOVE CRANKSHAFT POSITION SENSOR (a) Disconnect the crankshaft position sensor connector. (b) Remove the bolt, and then remove the crankshaft position sensor. INSPECTION 1. INSPECT CRANKSHAFT ...

Problem symptoms table
POWER BACK DOOR SYSTEM Symptom Suspected Area Power back door does not operate when switch* is pressed (* Switch indicates the satellite switch for power back door) ECU-B fuse Power back door main switch Satellite switch Power back door tou ...

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