Inspection Procedure

CHECK WIRE HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - LASER RADAR SENSOR)
1. Check for an open or short circuit in harness and connector between the distance control ECU and the laser radar sensor (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
1. NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
2. OK: GO TO NEXT STEP.
INSPECT LASER RADAR SENSOR
1. Remove the laser radar sensor with the connector.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between terminal IGB (L1-5) of the laser radar sensor and body ground.
  Standard: 10 to 14 V
4. Check the signal waveform between terminal LRDD (L1-3) of the laser radar sensor and body ground.
  Standard: Waveform similar to that in the illustration to the left is output.
  
  HINT:
  - Gauge set: 2 V/DIV, 10 ms/DIV
  - Condition: Ignition switch ON
  Fig 2: Signal Waveform Graph
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE LASER RADAR SENSOR (See LASER SENSOR )
2. OK: REPLACE CRUISE CONTROL ECU ASSY (See CRUISE CONTROL ECU ASSY )