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 HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO NEXT STEP 

1. Remove the laser radar sensor with connector.
2. Turn the ignition switch ON.
3. Measure the voltage between terminal IGB (L1-5) and body ground.

   Voltage: 10 to 14 V 

   Fig 1: Inspecting Laser Radar Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check the signal waveform between terminal LRDD (L1-3) and body ground.

   Standard: 

   The connect signal waveform appears, as shown in  Fig 2  . 

   HINT:

   • Gauge set: 2 V/DIV, 10 ms/DIV
   • Condition: Ignition switch ON

Fig 2: Checking Signal Waveform Between Terminal LRDD (L1-3) And Body Ground

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE LASER RADAR SENSOR 

OK: REPLACE DISTANCE CONTROL ECU ASSEMBLY