Headlight Cleaner Switch Circuit: Procedure

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

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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 MOTOR SALES, U.S.A., INC.
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)