Daytime Running Light Relay Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. Check that the daytime running lights operate.
   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   2 

OK → See step   7 

1. Check the operation of the high beam headlights.

   OK

   High beam headlights operate normally.

NG → See step   8 

OK: Go to next step 

1. Disconnect the running light relay (DRL) connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Relay Terminal 6 (+B) - Body ground	Power switch off	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the 2C instrument panel junction block assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Relay Terminal 2 (DRLS) - 2C-35	Always	Below 1 Ω
   2C-35 - Body ground	Always	10 kΩ or higher
   Relay Terminal 4 (DRLS) - 2C-22	Always	Below 1 Ω
   2C-22 - Body ground	Always	10 kΩ or higher
   Relay Terminal 3 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the instrument panel junction block assembly. Refer to REMOVAL .
   Fig 1: Inspecting Instrument Panel Junction Block Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2C-35 - MB-25 (DRL)	Always	Below 1 Ω
   2C-35 - Body ground	Always	10 kΩ or higher
   2C-22 - MB-22 (DIM)	Always	Below 1 Ω
   2C-22 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   9 

OK: Go to next step 

1. Temporarily replace the running light relay (DRL) with a new or normally functioning one.
2. Check that the daytime running lights operate normally.

   OK

   The daytime running lights operate normally.

NG → See step   10 

OK → END (RUNNING LIGHT RELAY WAS DEFECTIVE)