Inspection Procedure

1. Disconnect the distance control ECU and laser sensor connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   A20-22 (LRDD) - A36-3 (LRDD)	Always	Below 1 Ω
   A20-13 (IGB) - A36-5 (IGB)	Always	Below 1 Ω
   A20-22 (LRDD) - Body ground	Always	10 kΩ or higher
   A20-13 (IGB) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 1: Identifying A20 And A36 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Reconnect the distance control ECU connector. Not reconnect the laser sensor connector.
2. Turn the ignition switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A20-13 (IGB) - Body ground	Ignition switch on (IG)	10 to 16 V
   A20-22 (LRDD) - Body ground	Ignition switch on (IG)	4.5 to 5.5 V

NG: REPLACE DISTANCE CONTROL ECU 

Fig 2: Identifying A20 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Reconnect the laser sensor connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A36-5 (IGB) - Body ground	Ignition switch on (IG)	10 to 14 V

   Fig 3: Identifying A36 Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the signal waveform between terminal LRDD (A36-3) of the laser sensor and body ground.

   OK: 

   A waveform similar to that in the illustration on the left is output. 

   HINT:

   • Gauge set: 2 V/DIV, 10 msec./DIV
   • Condition: Ignition switch on (IG)

NG: REPLACE LASER SENSOR 

Fig 4: Identifying Signal Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : CHECK FOR INTERMITTENT PROBLEMS