Headlight Cleaner Switch Circuit: Procedure

1. Disconnect the A44 headlight cleaner control relay connector.
   Fig 1: Identifying Headlight Cleaner Control Relay (H Signal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A44-2 (H) - Body ground	Light control switch in head and headlight cleaner switch on	11 to 14 V
   A44-2 (H) - Body ground	Headlight cleaner switch off	Below 1 V

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   2 

OK → See step   3 

1. Remove the headlight cleaner switch assembly. Refer to COMPONENTS .
   Fig 2: Inspecting Headlight Cleaner Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   1 (E) - 4 (B)	Headlight cleaner switch off	10 kΩ or higher
   1 (E) - 4 (B)	Headlight cleaner switch on	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Headlight Cleaner Switch Assembly)

NG → See step   4 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - HEADLIGHT CLEANER CONTROL RELAY)