Inspection Procedure

1. Disconnect the distance control ECU and laser sensor connectors.
   Fig 1: Disconnecting Distance Control ECU And Laser Sensor Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connections	Condition	Specified value
   A20-23 (LRRD) - A36-4 (LRRD)	Always	Below 1 Ω
   A20-13 (IGB) - A36-5 (IGB)	Always	Below 1 Ω
   A20-23 (LRRD) - Body ground	Always	10 kΩ or higher
   A20-13 (IGB) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

NO: Go to Next Step 

1. Reconnect the cruise control ECU (distance control ECU) connector.
2. Turn the ignition switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connections	Condition	Specified value
   A20-13 (IGB) - Body ground	Ignition SW ON (IG)	10 to 14 V

4. Check the signal waveform between terminal LRRD (A20-23) of the cruise control ECU (distance control ECU) and body ground.
   Fig 2: Identifying Signal Waveform Between Terminal LRRD Of Cruise Control ECU And Body Ground

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: 

   A waveform similar to that in  Fig 2  is output. 

   HINT:

   • Gauge set: 2 V/DIV, 5 ms/DIV
   • Condition: Ignition switch on (IG)

NG: REPLACE CRUISE CONTROL ECU 

NO: REPLACE LASER SENSOR