Inspection Procedure

1. Disconnect the A3 headlight cleaner control relay connector.
2. Measure the voltage according to the value(s) in the table below

   Standard Voltage 

   TESTER CONNECTION TESTER CONNECTION CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   A3-2 (H) - Body ground	Light control switch in HEAD and headlight cleaner switch ON	11 to 14 V
   A3-2 (H) - Body ground	Headlight cleaner switch OFF	Below 1 V

Fig 1: Identifying A3 Headlight Cleaner Control Relay Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step  4

OK: Go to Next Step 

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

   Standard Voltage 

   TESTER CONNECTION TESTER CONNECTION CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   A3-5 (FRWA) - Body ground	Engine switch on (IG) and front washer switch OFF	11 to 14 V
   A3-5 (FRWA) - Body ground	Engine switch on (IG) and front washer switch ON	Below 1 V

Fig 2: Identifying A3 Headlight Cleaner Control Relay Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step  5

OK: Go to Next Step 

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

   Standard Voltage 

   TESTER CONNECTION TESTER CONNECTION CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   A3-1 (HDLO) - Body ground	Light control switch off	11 to 14 V
   A3-1 (HDLO) - Body ground	Light control switch in HEAD	Below 1 V

Fig 3: Identifying A3 Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step  6

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

1. Remove the headlight cleaner switch assembly (See HEADLIGHT CLEANER SWITCH  ).
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION TESTER CONNECTION CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   4-3	Headlight cleaner switch OFF	10 kΩ or higher
   4-3	Headlight cleaner switch ON	Below 1 Ω

Fig 4: Identifying Headlight Cleaner Switch Assembly Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE HEADLIGHT CLEANER SWITCH ASSEMBLY  (See HEADLIGHT CLEANER SWITCH  )

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (HEAD LP RELAY - HEADLIGHT CLEANER CONTROL RELAY) 

1. Disconnect the 2F front controller connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION TESTER CONNECTION CHART
   
   

   Tester Connection	Condition	Specified Condition
   A3-5 (FRWA) - 2F-8	Always	Below 1 Ω
   A3-5 (FRWA) - Body ground	Always	10 kΩ or higher

Fig 5: Identifying 2F Front Controller Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU) 

1. Disconnect the A36 main body ECU RH (cowl side junction block RH) connector.
2. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   TESTER CONNECTION TESTER CONNECTION CHART
   
   

   Tester Connector	Condition	Specified Condition
   A3-1 (HDLO) - A36-4 (HDLO)	Always	Below 1 Ω
   A3-1 (HDLO) - Body ground	Always	10 kΩ or higher

Fig 6: Identifying A36 Main Body ECU RH Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPAIR OR REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)