Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.
Turn the ignition switch on (IG) and turn the intelligent tester main switch on.

Select the item below in the ACTIVE TEST and then check the relay operation.

BODY NO. 5 (FRONT CONTROLLER) TEST DETAILS

Item	Test Details	Diagnostic Note
HEAD LIGHT (LO)	Light head (low) ON / OFF	-

OK:

Headlights come on.

NG: Go to step 2

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

INSPECT RELAY

Remove the HEAD relay from the engine room R/B & J/B.

Fig 1: Checking Head Relay Continuity
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

STANDARD RESISTANCE CONDITION CHART

Tester Connection	Specified Condition
3 - 5	10 k or higher
3 - 5	Below 1 (When battery voltage is applied to terminal 1 - 2)

NG: REPLACE RELAY

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (BATTERY - FRONT CONTROLLER)

Disconnect the 1H connector from the front controller.

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

Fig 2: Identifying 1H Front Controller Connector Terminals

STANDARD RESISTANCE CONDITION CHART

Tester Connection	Condition	Specified Condition
1H-3 - Body ground	Always	10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (HEAD RELAY - BODY GROUND)
1. Using a service wire, connect the 1H-3 on the wire harness side and body ground.
  OK:
  
  Headlight comes on.
  
  Fig 3: Identifying Head Relay Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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