Inspection Procedure

1. Select the ACTIVE TEST, use the intelligent tester (with CAN VIM) to generate a control command, and then check that the headlight illuminates.

   Driver side junction block ECU 

   ACTIVE TEST DETAIL - DRIVER SIDE JUNCTION BLOCK ECU
   
   

   Item	Test Details	Diagnostic Note
   HEAD LIGHT	Headlight relay ON / OFF	-

   OK: Headlight illuminates. 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

NG: Go to Next step 

1. Remove the HEAD LP relay from the engine room No. 1 relay block.
   Fig 1: Identifying Head LP Relay Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance of the relay.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   1 - 2	10 kΩ or higher
   1 - 2	Below 1Ω (when battery voltage is applied to terminals 3 and 4)

NG: REPLACE RELAY 

OK: Go to Next step 

Fig 2: Identifying Driver Side Junction Block ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the D2 ECU connector.
2. Using a service wire, connect D2-7 (HRLY) on the wire harness side and body ground.
3. Check that the headlight illuminates.

   OK: Headlight illuminates. 

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE