HI-beam Headlight does not Illuminate: Procedure

1. Using the Techstream, perform the Active Test.
   BODY NO. 5
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Head Light High	Headlight HI beam illumination	OFF - ON	-

   OK

   Headlight HI condition is switched by Active Test.

NG → See step   5 

OK: Go to next step 

1. Using the Techstream, read the Data List.
   COMBINATION SWITCH
   
   

   Tester Display	Measurement Item/Display	Normal Condition	Diagnostic Note
   Dimmer Hi Switch	Headlight dimmer switch signal (Hi position)/ON or OFF	ON: Headlight dimmer switch Hi position OFF: Headlight dimmer switch OFF	-

   OK

   Condition sign can be displayed.

NG → See step   9 

OK: Go to next step 

1. Temporarily replace the windshield wiper switch with a new or normally functioning one. Refer to REMOVAL .
2. Check the HI-beam headlight operation.

   OK

   HI-beam headlight operation is normal.

NG → See step   4 

OK → See step   8 

1. Temporarily replace the multiplex network front light ECU with a new or normally functioning one.
2. Check the HI-beam headlight operation.

   OK

   HI-beam headlight operation is normal.

NG → REPLACE MAIN BODY ECU 

OK → END (REPLACE MULTIPLEX NETWORK FRONT LIGHT ECU) 

Fig 1: Identifying Multiplex Front Light ECU And Headlight Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the B14 ECU connector.
2. Disconnect the B1 or B11 light connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   for LH 

   for RH 

   Tester Connection	Condition	Specified Condition
   B14-6 (HLHL) - B1-2 (HI)	Always	Below 1 Ω
   B1-1 (E) - Body ground	Always	Below 1 Ω
   B14-6 (HLHL) - Body ground	Always	10 kΩ or higher

   Tester Connection	Condition	Specified Condition
   B14-5 (HLHR) - B11-2 (HI)	Always	Below 1 Ω
   B11-1 (E) - Body ground	Always	Below 1 Ω
   B14-5 (HLHR) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the headlight with a new or normally functioning one. Refer to REMOVAL .
2. Check the HI-beam headlight operation.

   OK

   HI-beam headlight operation is normal.

NG → REPLACE MULTIPLEX NETWORK FRONT LIGHT ECU 

OK → See step   7