Inspection Procedure

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. 

1. Remove the laser radar sensor with the connector.
   Fig 1: Identifying Laser Radar Sensor Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 

   Fig 2: Laser Radar Sensor Signal Waveform Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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

1. NG: REPLACE LASER RADAR SENSOR  (See REPLACEMENT )
2. OK: REPLACE CRUISE CONTROL ECU ASSY  (See REPLACEMENT )