Headlight (HI-BEAM) 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
   Head Light HI	Running light relay*1	OFF or ON	-
   	Headlight dimmer relay*2

   • *1: w/ Daytime Running Light System
   • *2: w/o Daytime Running Light System

   OK

   Relay operates. (High beam headlights illuminate.)

   RESULT
   
   

   Result	Proceed to
   OK	A
   NG (w/ Daytime Running Light System)	B
   NG (w/o Daytime Running Light System)	C

B → See step   2 

C → See step   6 

A → See step   11 

1. Remove the running light relay from the No. 2 engine room relay block assembly.
2. Connect the positive (+) lead from the battery to terminal 6 (+B).
   Fig 1: Measuring Voltage Of Running Light Relay Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Connect the negative (-) lead from the battery to terminal 4 (H) and 3 (E).
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   1 (HLOR) - Battery negative terminal	Always	11 to 14 V
   5 (HLOL) - Battery negative terminal	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Running Light Relay)

5. Reinstall the running light relay.

NG → See step   10 

OK: Go to next step 

1. Remove the running light relay from the No. 2 engine room relay block.
   Fig 2: Identifying Running Light Relay Terminal On No. 2 Engine Room Relay Block

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   6 (+B) (running light relay terminal) - Body ground	Always	11 to 14 V

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 (E) (running light relay terminal) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	No. 2 Engine Room Relay Block
   *2	Running Light Relay Terminal

4. Reinstall the running light relay.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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
   4 (H) (running light relay terminal) - 3B-25	Always	Below 1 Ω
   4 (H) (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 3: 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-25 - 3F-22 (DIM)	Always	Below 1 Ω
   3B-25 - 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   12 

1. Inspect the headlight dimmer relay. Refer to ON-VEHICLE INSPECTION .

NG → REPLACE HEADLIGHT DIMMER RELAY 

OK: Go to next step 

1. Remove the headlight dimmer relay from the No. 2 engine room relay block.
   Fig 4: Identifying Headlight Dimmer Relay Holder On No. 2 Engine Room Relay Block

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   2 (Headlight dimmer relay holder) - Body ground	Always	11 to 14 V
   5 (Headlight dimmer relay holder) - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	No. 2 Engine Room Relay Block
   *2	Headlight Dimmer Relay Holder

3. Reinstall the headlight dimmer relay.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the headlight dimmer 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
   1 (Headlight dimmer relay holder) - 3B-25	Always	Below 1 Ω
   1 (Headlight dimmer relay holder) - Body ground	Always	10 kΩ or higher

4. Reconnect the instrument panel junction block assembly connector.
5. Reinstall the headlight dimmer relay.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the instrument panel junction block assembly.
   Fig 5: 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-25 - 3F-22 (DIM)	Always	Below 1 Ω
   3B-25 - 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   12