HI-beam Headlight does not Illuminate: Procedure

1. Using the Techstream, read the Data List.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Head Light SW (HEAD)	Headlight switch signal (Head) /ON or OFF	ON: Headlight switch (Head) on OFF: Headlight switch off	-

   OK

   When the headlight dimmer switch operation is performed, the result will be the same as above.

NG → See step   3 

OK: Go to next step 

1. Using the Techstream, perform the Active Test.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Head Light Hi	Headlight (Hi)	OFF/ON	-

   OK

   Headlight hi beam turns on/off.

NG → See step   5 

OK → REPLACE MAIN BODY ECU 

1. Remove the headlight dimmer switch. Refer to INSPECTION .
   Fig 1: Inspecting Headlight Dimmer Switch

   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
   18 (T) - 12 (EL)	Headlight dimmer switch (Light control switch) head	Below 1 Ω
   20 (H) - 12 (EL)
   17 (HF) - 12 (EL)	Headlight dimmer switch (Light control switch) flash
   11 (HU) - 12 (EL)
   11 (HU) - 12 (EL)	Headlight dimmer switch (Light control switch) high
   18 (T) - 12 (EL)	Headlight dimmer switch (Light control switch) off	10 kΩ or higher
   20 (H) - 12 (EL)

NG → See step   17 

OK: Go to next step 

Fig 2: Identifying E14 Switch And E1, E2 , 2D ECU Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E14 switch connector.
2. Disconnect the E1, E2 and 2D ECU connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E2-17 (HEAD) - E14-20 (H)	Always	Below 1 Ω
   E1-23 (TAIL) - E14-18 (T)
   E1-13 (HF) - E14-17 (HF)
   2D-13 (HU) - E14-11 (HU)
   E14-12 (EL) - Body ground
   E2-17 (HEAD) - Body ground	Always	10 kΩ or higher
   E1-23 (TAIL) - Body ground
   E1-13 (HF) - Body ground
   2D-13 (HU) - Body ground

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU 

1. Remove the headlight relay from the engine room relay block.
   Fig 3: Checking Harness And Connector (Headlight Relay (Head HI) - Battery)

   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
   HEAD HI relay terminal 2 - Body ground	Always	11 to 14 V
   HEAD HI relay terminal 3 - Body ground

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the DRL No. 3 or RR A/C relay from the engine room relay block.
   Fig 4: Checking Harness And Connector (DRL No. 3 Relay - Body Ground)

   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
   DRL No, 3 or RR A/C relay terminal 1 - Body ground	Light control switch head, dimmer switch low	11 to 14 V
   	Light control switch OFF	Below 1 V

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   DRL No, 3 or RR A/C relay terminal 2 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the DRL No. 4 relay from the engine room relay block.
   Fig 5: Checking Harness And Connector (DRL No. 4 Relay - Body Ground)

   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
   DRL No. 4 relay terminal 1 - Body ground	Light control switch head, dimmer switch low	11 to 14 V
   	Light control switch OFF	Below 1 V

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   DRL No. 4 relay terminal 2 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the headlight relay from the engine room relay block.
   Fig 6: Identifying Headlight Relay Terminals (HEAD HI)

   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	Battery voltage not applied to terminals 1 and 2	10 kΩ or higher
   	Battery voltage applied to terminals 1 and 2	Below 1 Ω

NG → REPLACE HEADLIGHT RELAY (HEAD HI) 

OK: Go to next step 

1. Remove the DRL No. 3 or RR A/C relay from the engine room relay block.
   Fig 7: Identifying DRL No. 3 Or RR A/C Relay

   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	Battery voltage not applied to terminals 1 and 2	10 kΩ or higher
   	Battery voltage applied to terminals 1 and 2	Below 1 Ω
   3 - 4	Battery voltage not applied to terminals 1 and 2	Below 1 Ω
   	Battery voltage applied to terminals 1 and 2	10 kΩ or higher

NG → REPLACE DRL NO. 3 OR RR A/C RELAY 

OK: Go to next step 

1. Remove the DRL No. 4 relay from the engine room relay block.
   Fig 8: Identifying DRL No. 4 Relay 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	Battery voltage not applied to terminals 1 and 2	10 kΩ or higher
   	Battery voltage applied to terminals 1 and 2	Below 1 Ω

NG → REPLACE DRL NO. 4 RELAY 

OK: Go to next step 

Fig 9: Checking Harness And Connector (Head HI Relay - DRL No. 3 Or RR A/C Relay And DRL No. 4 Relay)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the headlight relay, DRL No. 3 or RR A/C relay and DRL No. 4 relay from the engine room relay block.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   HEAD HI relay terminal 5 - DRL No. 3 or RR A/C relay terminal 5	Always	Below 1 Ω
   DRL No. 3 or RR A/C Relay terminal 3 - DRL No. 4 Relay terminal 5
   HEAD HI relay terminal 5 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the headlight relay and DRL No. 4 relay from the engine room relay block.
   Fig 10: Identifying Headlight Relay And DRL No. 4 Relay

   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
   HEAD HI relay terminal 5 - DRL No. 4 relay terminal 5	Always	Below 1 Ω
   DRL No. 4 relay terminal 3 - Body ground
   HEAD HI relay terminal 5 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Fig 11: Checking Harness And Connector (DRL No. 3 Or RR A/C Relay - Daytime Running Light Resistor)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the DRL No. 3 or RR A/C relay from the engine room relay block.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   DRL No. 3 or RR A/C relay terminal 4 - A33-1 (B)	Always	Below 1 Ω
   A33-1 (B) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the DRL No. 3 or RR A/C relay from the engine room relay block.
   Fig 12: Identifying Daytime Running Light Resistor Connector Terminal

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A33-2 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Fig 13: Identifying Headlight Relay And 2B Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the headlight relay from the engine room relay block.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   HEAD HI relay terminal 1 - 2B-16 (DRL)*1	Always	Below 1 Ω
   HEAD HI relay terminal 1 - 2B-16 (DIM)*2	Always	Below 1 Ω
   HEAD HI relay terminal 1 - Body Ground	Always	10 kΩ or higher

   • *1: for U.S.A.
   • *2: for except U.S.A.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the main body ECU with a new or normally functioning one.
2. Check that the headlight high beam illuminates.

   OK

   Headlight high beam illuminates

NG → See step   18 

OK → END (MAIN BODY ECU IS DEFECTIVE)