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
INSPECTION PROCEDURE
1 CHECK DISTANCE CONTROL ECU (IGB VOLTAGE)
- Disconnect the L1 laser sensor connector.
- Measure the voltage according to the value(s) in the table below.
Standard voltage
2 CHECK HARNESS AND CONNECTOR (LASER SENSOR - ECM AND BODY GROUND)
- Disconnect the E4 connector from the ECM.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
3 CHECK HARNESS AND CONNECTOR (LASER SENSOR - DISTANCE CONTROL ECU)
- Disconnect the D2 distance control ECU connector.
- Measure the resistance according to the value(s) in the table below.
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:
The Other Caller cannot Hear Your Voice, or Your Voice is too Quiet or
Distorted
INSPECTION PROCEDURE
1 CHECK CELLULAR PHONE
Check if the other side can hear your voice properly.
OK:
Your voice can be heard correctly.
2 CHECK SETTINGS
Check if the mute switch is set to ON.
OK:
Mute switch is not set to ON.
3 CHECK SETTINGS
Enter the "Handsfree ...
Master Error
DTC 01-DF Master Error
DESCRIPTION
DTC No.
DTC Detection Condition
Trouble Area
01-DF
*1
The device with a display fails and the master is
switched to the audio device.
Also when a communication error between sub-master
(audio) and master occu ...
Fuel tank
Components
REMOVAL
1. DISCHARGE FUEL SYSTEM PRESSURE
(See page FU-1)
2. REMOVE CHARCOAL CANISTER PROTECTOR (See
page FU-30)
3. REMOVE REAR FLOOR NO. 2 CROSSMEMBER BRACE LH
(a) Remove the 2 bolts and the rear floor No. 2
crossmember brace LH.
4. REMOVE FUEL TANK FILLER HOSE COVER ...
