Inspection Procedure

1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG) and turn the intelligent tester main switch on.
3. Select the item below in the DATA LIST, and read the display on the intelligent tester.

   MAIN BODY (MAIN BODY ECU): 

   DATA LIST
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   ILLUMINATE RATE	Illumination rate information / 0 ms to 99.99 ms	0.8 ms to 22.0 ms (Value is output according to ambient light levels)	-

   OK: Normal condition listed above is displayed. 

NG: Go to step 2 

OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

1. Disconnect the G3 automatic light control sensor connector.
2. Disconnect the E60 main body ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   E60-18 (CLTE) - G3-3 (CLTE)	Always	Below 1 Ω
   E60-19 (CLTS) - G3-5 (CLTS)	Always	Below 1 Ω
   E60-20 (CLTB) - G3-6 (CLTB)	Always	Below 1 Ω
   E60-18 (CLTE) - Body ground	Always	10 kΩ or higher
   E60-19 (CLTS) - Body ground	Always	10 kΩ or higher
   E60-20 (CLTB) - Body ground	Always	10 kΩ or higher

Fig 1: Identifying G3 And E60 Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step. 

1. Reconnect the main body ECU connector.
2. Measure the voltage and resistance according to the value(s) in the table below.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   G3-6 (CLTB) - G3-3 (CLTE)	Engine switch off	Below 1 V
   G3-6 (CLTB) - G3-3 (CLTE)	Engine switch on (IG)	10 to 14 V

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   G3-3 (CLTE) - Body ground	Always	Below 1 Ω

   Fig 2: Identifying G3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

OK: Go to next step. 

1. Reconnect the automatic light control sensor connector.
2. Connect an oscilloscope to the automatic light control sensor connector.
   Fig 3: Identifying Automatic Light Control Sensor Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the waveform.

   OK 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Tool Setting	Condition	Specified Condition
   G3-3 (CLTE) - G3-5 (CLTS)	5 V/DIV., 5 ms./DIV.	Engine switch on (IG), light control switch in AUTO	Correct waveform is as shown

   HINT:

   If the ambient light becomes brighter, width A becomes narrower.

   Fig 4: Identifying Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE AUTOMATIC LIGHT CONTROL SENSOR 

OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY