Headlight Signal Circuit: Procedure

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - HEADLIGHT CLEANER CONTROL RELAY)

Disconnect the A44 headlight cleaner control relay connector.

Fig 1: Identifying Harness And Connector (Integration Relay - Headlight Cleaner Control Relay)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
A44-1 (HDLO) - Body ground	Light control switch in head position	Below 1 V
A44-1 (HDLO) - Body ground	Light control switch off	11 to 14 V

TEXT IN ILLUSTRATION

*1	Front view of wire harness connector (to Headlight Cleaner Control Relay)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 2

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE