Headlight Signal Circuit [08/2015 - 08/2019]: Procedure

1. Disconnect the A32 headlight cleaner control relay connector.

   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
   A32-1 (HDLO) - Body ground	Headlight dimmer switch in head	11 to 14 V
   A32-1 (HDLO) - Body ground	Headlight dimmer switch not in head	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Headlight Cleaner Control Relay)

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [08/2015 - 08/2019] )

Result: 

NG 

See step  2

1. Disconnect the G46 main body ECU.
2. Disconnect the A32 headlight cleaner control relay connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G46-16 (HDLO) - A32-1 (HDLO)	Always	Below 1 Ω
   G46-16 (HDLO) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR