Automatic Light Control Function does not Operate: Procedure

1. Using the Techstream, read the Data List. Refer to DATA LIST / ACTIVE TEST [09/2012 - ] .
   MAIN BODY
   
   

   Tester Display	Measurement Item/Display	Normal Condition	Diagnostic Note
   Illumination Rate Info	Condition of automatic light control sensor/0 to 2162.65 ms	Condition value will be displayed	-

   OK

   Condition sign can be displayed.

   RESULT
   
   

   Result	Proceed to
   NG	A
   OK	B

B → See step   4 

A: Go to next step 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L12 main body ECU connector.
2. Disconnect the M2 automatic light control sensor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L12-20 (CLTB) - M2-6 (CLTB)	Always	Below 1 Ω
   L12-19 (CLTS) - M2-5 (CLTS)	Always	Below 1 Ω
   L12-18 (CLTE) - M2-3 (CLTE)	Always	Below 1 Ω
   L12-20 (CLTB) - Body ground	Always	10 kΩ or higher
   L12-19 (CLTS) - Body ground	Always	10 kΩ or higher
   L12-18 (CLTE) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   L12-20 (CLTB) - Body ground	Engine switch on (IG)	11 to 14 V

NG → REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) 

OK → See step   6 

1. Using the Techstream, read the Data List. Refer to DATA LIST / ACTIVE TEST [09/2012 - ] .
   COMBINATION SWITCH
   
   

   Tester Display	Measurement Item/Display	Normal Condition	Diagnostic Note
   Light Auto Switch	Headlight dimmer switch signal (AUTO position)/ON or OFF	ON: Headlight dimmer switch AUTO position OFF: Headlight dimmer switch OFF	-

   OK

   Condition sign can be displayed.

NG → REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) 

OK: Go to next step 

1. Temporarily replace the windshield wiper switch with a new or normally functioning one. Refer to REMOVAL [09/2012 - ] .
2. Check the windshield wiper switch operation.

   OK

   Windshield wiper switch operation is normal.

NG → REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) 

OK → END (WINDSHIELD WIPER SWITCH WAS DEFECTIVE)