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   12 

1. Chose the model to be inspected.

   Result

   Result	Proceed to
   for Canada	A
   except Canada	B

B → See step   7 

A: Go to next step 

1. Check the operation of the high beam headlights.

   OK

   High beam headlights operate normally.

NG → See step   11 

OK: Go to next step 

1. Remove the DRL MODULE relay from the engine room relay block and junction block assembly.
   Fig 1: Inspecting DRL Relay Connector Terminals

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

   Standard

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

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (DRL MODULE Relay)

NG → REPLACE DRL MODULE RELAY 

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 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 .
2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
   Fig 2: Inspecting Instrument Panel Junction Block Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. 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 → See step   14 

OK → See step   13 

1. Remove the DRL relay from the engine room relay block and junction block assembly.
   Fig 3: Identifying Fog Light Relay Connector Terminals

   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
   3 - 5	Voltage is not applied between terminals 1 and 2	10 kΩ or higher
   3 - 5	Voltage is applied between terminals 1 and 2	Below 1 Ω

NG → REPLACE DRL RELAY 

OK: Go to next step 

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Relay terminal 1 - Body ground	Always	11 to 14 V
   Relay terminal 3 - Body ground	Always	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 - 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 .
2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
   Fig 4: Inspecting Instrument Panel Junction Block Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. 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 → See step   14 

OK → See step   12