Daytime Running Light Relay Circuit [08/2015 - ]: 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 light*1, *3 Daytime running light and accessory light*2	ON/OFF	-

   • *1: for Halogen Headlight
   • *2: for LED Headlight (w/o Side Turn Signal Light)
   • *3: for LED Headlight (w/ Side Turn Signal Light)

   OK

   Daytime running lights illuminate.

   Result

   Result	Proceed to
   OK	A
   NG (for Halogen Headlight)	B
   NG (for LED Headlight)	C

B → Refer to   2 

C → Refer to   7 

A → Refer to   11 

1. Check the operation of the high beam headlights.

   OK

   High beam headlights operate normally.

NG → Refer to   10 

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 (H) - 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 [08/2015 - ] .

   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 → Refer to   13 

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 → Refer to   12 

OK → END (RUNNING LIGHT RELAY (DRL) WAS DEFECTIVE) 

1. Check the operation of the low beam headlights.

   OK

   Low beam headlights operate normally.

NG → Refer to   10 

OK: Go to next step 

1. Disconnect the 2C instrument panel junction block assembly connector.
2. Disconnect the A79 headlight assembly LH connector.
3. Disconnect the A81 headlight assembly RH connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A79-4 (DRL) - 2C-35	Always	Below 1 Ω
   A81-4 (DRL) - 2C-35	Always	Below 1 Ω
   2C-35 - 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 [08/2015 - ] .

   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

   TEXT IN ILLUSTRATION
   
   

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

NG → Refer to   13 

OK → Refer to   12