Daytime Running Light Relay Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. Check that the relay operates.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Daytime Running Light	Running light relay	OFF or ON	-

   OK

   Relay operates. (Daytime running lights illuminate.)

NG → See step   2 

OK → See step   8 

1. Check the operation of the high beam headlights.

   OK

   High beam headlights operate normally.

NG → See step   6 

OK: Go to next step 

1. Remove the running light relay from the No. 2 engine room relay block.
   Fig 1: Identifying Running Light Relay Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect a positive (+) lead from the battery to terminal 6 (+B).
3. Connect a negative (-) lead from the battery to terminal 2 (DRLS) and 3 (E).
4. Check for pulses according to the value(s) in the table below.

   OK

   Tester Connection	Condition	Specified Condition
   1 (HLOR) - Battery negative terminal	Always	Pulse generation
   5 (HLOL) - Battery negative terminal	Always	Pulse generation

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Running Light Relay)

5. Reinstall the running light relay.

NG → See step   7 

OK: Go to next step 

1. Remove the running light relay from the No. 2 engine room relay block assembly.
2. Disconnect the 3B instrument panel junction block assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2 (DRLS) (running light relay terminal) - 3B-36	Always	Below 1 Ω
   2 (DRLS) (running light relay terminal) - Body ground	Always	10 kΩ or higher

4. Reconnect the instrument panel junction block assembly connector.
5. Reinstall the running light relay.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the instrument panel junction block assembly.
   Fig 2: Measuring Resistance Of Instrument Panel Junction Block Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the main 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
   3B-36 - 3F-25 (DRL)	Always	Below 1 Ω
   3B-36 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

4. Reinstall the main body ECU.
5. Reinstall the instrument panel junction block assembly.

NG → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

OK → See step   9