WIPER / WASHER: WIPER AND WASHER SYSTEM: TERMINALS OF ECU; 2018 - 2024 MY Camry [03/2017

Last Modified: 11-20-2023	6.11:8.1.0	Doc ID: RM1000000012SCL
Model Year Start: 2018	Model: Camry	Prod Date Range: [03/2017 - ]
Title: WIPER / WASHER: WIPER AND WASHER SYSTEM: TERMINALS OF ECU; 2018 - 2024 MY Camry [03/2017 - ]

TERMINALS OF ECU

CHECK WINDSHIELD WIPER MOTOR ASSEMBLY

(a) Disconnect the A31 windshield wiper motor assembly connector.

(b) 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
A31-4 (+B) - Body ground	SB - Body ground	Ignition switch ON signal (Power source circuit)	Ignition switch ON	11 to 14 V
			Less than approximately 60 seconds after ignition switch turned off	11 to 14 V
			Approximately 60 seconds after ignition switch turned off	Below 1 V
A31-1 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

HINT:

Since the A31 windshield wiper motor assembly connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.

(d) 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

A31-3 (2S) - Body ground

B - Body ground

Windshield wiper motor assembly HI operation signal

Windshield wiper motor assembly stopped

11 to 14 V

Windshield wiper motor assembly operating in HI

Below 1 V

A31-2 (LIN) - Body ground

R - Body ground

LIN communication signal

Ignition switch ON

Pulse generation

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
3B-3 - Body ground	LA - Body ground	Ground	Always	Below 1 Ω
3C-1 - Body ground	LG - Body ground	Battery power supply	Always	11 to 14 V
3F-1 - Body ground	W - Body ground	Battery power supply	Always	11 to 14 V

(d) 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
3C-2 - Body ground	R - Body ground	Washer circuit IG power source	Ignition switch ON	11 to 14 V
K51-3 (LIN3) - Body ground	BE - Body ground	LIN communication line	Ignition switch ON	Pulse generation
K51-12 (FWSR) - Body ground	L - Body ground	WASHER Relay operation signal	Ignition switch ON, front washer switch off	11 to 14 V
K51-12 (FWSR) - Body ground	L - Body ground	WASHER Relay operation signal	Ignition switch ON, front washer switch on	Below 2 V
K52-21 (WPS) - Body ground	LG - Body ground	WIPER Relay operation signal	Ignition switch ON	11 to 14 V
			Less than approximately 60 seconds after ignition switch turned off	11 to 14 V
			Approximately 60 seconds after ignition switch turned off	Below 1 V

CHECK COMBINATION METER ASSEMBLY

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