Terminals Of Ecu [03/2019 - ]

1. Disconnect the O23 and O24 windshield wiper switch assembly connectors.
   Fig 1: O23 And O24 Windshield Wiper Switch Assembly Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   O23-2 (+B) - Body ground	R - Body ground	Engine switch on (IG) signal (Power source circuit)	Engine switch on (IG)	11 to 14 V
   			Engine switch off	Below 1 V
   O23-3 (TAIL) - Body ground	LG - Body ground	Headlight dimmer switch position signal	Engine switch on (IG)	11 to 14 V
   			Engine switch off	Below 1 V
   O23-4 (RLY2) - Body ground	R - Body ground	INT relay operation signal	Engine switch on (IG)	11 to 14 V
   			Engine switch off	Below 1 V
   O23-5 (RLY1) - Body ground	B - Body ground	WIP relay operation signal	Engine switch on (IG)	11 to 14 V
   			Engine switch off	Below 1 V
   O23-7 (E) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω
   O24-4 (EW) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

   HINT: 

   If the result is not as specified, there may be a malfunction in the wire harness.

3. Reconnect the O23 and O24 windshield wiper switch assembly connectors.
4. Measure the voltage and check for pulses according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   O23-3 (TAIL) - Body ground	LG - Body ground	Headlight dimmer switch position signal	Engine switch on (IG), light control switch in off position	11 to 14 V
   			Engine switch on (IG), light control switch in on position	Below 1 V
   O23-4 (RLY2) - Body ground	R - Body ground	INT relay operation signal	Engine switch on (IG), wiper switch off	11 to 14 V
   			Engine switch on (IG), wiper switch in LO position	Below 1 V
   O23-5 (RLY1) - Body ground	B - Body ground	WIP relay operation signal	Engine switch on (IG), wiper switch off	11 to 14 V
   			Engine switch on (IG), wiper switch in HI position	Below 1 V
   O23-8 (MPX1) - Body ground*	G - Body ground	LIN communication signal	Engine switch on (IG)	Pulse generation
   O23-10 (CSS+) - O23-9 (CSS-)	R - L	Vehicle speed signal	Engine switch on (IG), wheel being rotated	Pulse generation
   O23-20 (+S) - Body ground	G - Body ground	Wiper motor operation signal	Engine switch on (IG), wiper switch off (Wiper blades are at stop (park) position)	Below 1 V
   			Engine switch on (IG), wiper switch in LO or HI position	11 to 14 V
   O24-7 (WF) - Body ground	R - Body ground	Washer motor operation signal	Engine switch on (IG), washer switch off	11 to 14 V
   			Engine switch on (IG), washer switch on	Below 1 V

   1. *: w/ Auto Wiper System

   HINT: 

   If the result is not as specified, the windshield wiper switch assembly may be malfunctioning.

1. Disconnect the A44 headlight cleaner control relay connector.
   Fig 2: A44 Headlight Cleaner Control Relay Connector End View

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

   HINT: 

   The voltage cannot be measured with the connector connected to the headlight cleaner control relay as the connector is watertight.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A44-3 (IG) - Body ground	B - Body ground	Engine switch on (IG) signal (Power source circuit)	Engine switch on (IG)	11 to 14 V
   			Engine switch off	Below 1 V
   A44-4 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   A44-6 (PB) - Body ground	W - Body ground	Headlight cleaner motor operation signal	Always	11 to 14 V

   HINT: 

   If the result is not as specified, there may be a malfunction in the wire harness.

Refer to TERMINALS OF ECU [03/2019 - ]

Refer to TERMINALS OF ECU [03/2019 - ]