Automatic Light Control Sensor Circuit: Wiring Diagram

1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to the ON position and press the intelligent tester main switch ON.
3. Select the items below in the DATA LIST, and read the displays on the intelligent tester.

   BODY 

   BODY DATA LIST
   
   

   Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
   ILLUMINATE RATE	Illuminate rate/(0.8ms to 22.0ms)	Value is output according to ambient light	-

NG : Go to step 2 

OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

1. Disconnect the automatic light control sensor connector and multiplex network body ECU connector.
2. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying Automatic Light Control Sensor Connector And Multiplex Network Body ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Resistance 

   TESTER CONNECTION - SPECIFIED CONDITION (RESISTANCE)
   
   

   Tester connection	Condition	Specified condition
   CLTE (A10-3) - CLTE (B4-4)	Always	Below 1 Ω
   CLTS (A10-5) - CLTS (B4-5)	Always	Below 1 Ω
   CLTB (A10-6) - CLTB (B4-6)	Always	Below 1 Ω
   CLTE (B4-4) - Body ground	Always	10 kΩ or higher
   CLTS (B4-5) - Body ground	Always	10 kΩ or higher
   CLTB (B4-6) - Body ground	Always	10 kΩ or higher

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : GO TO NEXT STEP 

1. Measure the voltage according to the value(s) in the table below.
   Fig 3: Identifying Multiplex Network Body ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Voltage 

   TESTER CONNECTION - SPECIFIED CONDITION (VOLTAGE)
   
   

   Tester connection	Condition	Specified voltage
   CLTE (B4-4) - CLTB (B4-6)	Ignition switch OFF --> ON	Below 1 V --> 10 to 14 V

NG : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

OK : REPLACE AUTOMATIC LIGHT CONTROL SENSOR