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 cruise control ECU (distance control ECU) with the connector.
   Fig 1: Identifying Cruise Control ECU Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to the ON position.
3. Measure the voltage between terminal IGB (D2-13) of the cruise control ECU (distance control ECU) and body ground.

   Standard: 

   10 to 14 V 

   Fig 2: Identifying Waveform Signal Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check the signal waveform between terminal LRRD (D2-23) of the cruise control ECU (distance control ECU) and body ground.

   Standard: 

   Waveform similar to that in the illustration to the left is output. 

HINT:

• Gauge set: 2 V/DIV, 5 ms/DIV
• Condition: Ignition switch ON

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