Daytime Running Light Relay Circuit [12/2014 - ]: Procedure

1. Check the operation of the low beam headlights.

   OK

   Low beam headlights operate normally.

NG → See step   5 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. Perform the Active Test according to the display on the Techstream.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Daytime Running Light	Daytime running lights	ON/OFF	-

   OK

   Daytime running lights illuminate.

NG → See step   3 

OK → See step   6 

1. Disconnect the 3C instrument panel junction block assembly connector.
2. Disconnect the A67 headlight assembly LH connector.
3. Disconnect the A66 headlight assembly RH connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A67-8 (B) - 3C-22	Always	Below 1 Ω
   A66-8 (B) - 3C-22	Always	Below 1 Ω
   3C-22 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the instrument panel junction block assembly. Refer to REMOVAL [12/2014 - ] .

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3C-22 - MB-25 (DRL)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Instrument Panel Junction Block Assembly)

NG → See step   7 

OK → See step   8