Headlight Relay Circuit [09/2013 - ]: Procedure

1. Using the Techstream, perform the Active Test. Refer to DATA LIST / ACTIVE TEST [09/2013 - ] .
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Headlight Relay	Low beam headlight relay	ON/OFF	-

   OK

   Headlight relay operates (low beam headlights come on).

NG → See step   2 

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 

1. Remove the headlight relay from the No. 2 motor compartment room relay block and junction block.

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

NG → REPLACE HEADLIGHT RELAY (H-LP) 

OK: Go to next step 

1. Remove the headlight relay from the No. 2 motor compartment room relay block and junction 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
   Headlight relay terminal 3- Body ground	Always	11 to 14 V
   Headlight relay terminal 1 - Body ground

   TEXT IN ILLUSTRATION
   
   

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the headlight relay from the No. 2 motor compartment room relay block and junction block.
2. Disconnect the E15 main body ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Headlight relay terminal 2 - E15-20 (HRLY)	Always	Below 1 Ω
   E15-20 (HRLY) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5