Headlight (HI-BEAM) Circuit [10/2015 - ]: Procedure

1. Using the Techstream, perform the Active Test.

   Refer to DATA LIST / ACTIVE TEST [12/2012 - ] .

   Body Electrical > Main Body > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Head Light Hi	Headlight dimmer relay	ON or OFF	-

   Body Electrical > Main Body > Active Test 

   Tester Display
   Head Light Hi

   Result	Proceed to
   	High beam headlights come on
   	High beam headlights do not come on

Result: 

High beam headlights come on 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2012 - ]  . 

Result: 

High beam headlights do not come on 

See step  2

1. Remove the headlight relay from the No. 1 engine room relay block and junction block assembly.

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

   Result	Proceed to
   	OK
   	NG

Result: 

NG 

REPLACE HEADLIGHT RELAY (DIMMER) 

Result: 

OK 

See step  3

1. Remove the headlight relay from the No. 1 engine room relay block and junction block assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Headlight Relay)

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Headlight relay terminal 3 - Body ground	Always	11 to 14 V
   Headlight relay terminal 2 - Body ground

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the headlight relay from the No. 1 engine room relay block and junction 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
   Headlight relay terminal 1 - 3B-54	Always	Below 1 Ω
   3B-54 - Body ground	Always	10 kΩ or higher

   Result	Proceed to
   	OK
   	NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [12/2012 - ] .

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

   Refer to REMOVAL [12/2012 - ] .

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A-22 (DIM) - 3B-54	Always	Below 1 Ω

   Result	Proceed to
   	OK
   	NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2015 - ]  . 

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [12/2012 - ]  .