Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Terminals Of Ecu

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Exterior / Lighting (ext) / Lighting System(for Gasoline Model Without Cornering Light) / Terminals Of Ecu

TERMINALS OF ECU

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
4D-3 - Body ground	LA - Body ground	Ground	Always	Below 1 Ω
4F-1 - Body ground	LG - Body ground	Battery power supply	Always	11 to 14 V
4K-1 - Body ground	W - Body ground	Battery power supply	Always	11 to 14 V

(d) Measure the voltage and resistance, and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
4F-19 - Body ground	BE - Body ground	BKUP LP relay drive output	Engine switch off, reverse (R) not selected	Below 1 V
4F-19 - Body ground	BE - Body ground	BKUP LP relay drive output	Engine switch on (IG), reverse (R) selected	11 to 14 V
4F-28 - Body ground	GR - Body ground	Daytime running light system drive output	Daytime running light system operating	Below 1 V
4F-28 - Body ground	GR - Body ground	Daytime running light system drive output	Daytime running light system not operating	11 to 14 V
4F-31 - Body ground	V - Body ground	H-LP LH relay drive output	Light control switch in head position	Below 1 V
4F-31 - Body ground	V - Body ground	H-LP LH relay drive output	Taillights off	11 to 14 V
4F-32 - Body ground	LA-B - Body ground	Parking lights and front side marker lights drive output	Taillights on	11 to 14 V
4F-32 - Body ground	LA-B - Body ground	Parking lights and front side marker lights drive output	Taillights off	Below 1 V
4H-10 - Body ground	LG - Body ground	Back-up lights drive output	Engine switch off, reverse (R) not selected	Below 1 V
4H-10 - Body ground	LG - Body ground	Back-up lights drive output	Engine switch on (IG), reverse (R) selected	11 to 14 V
4H-30 - Body ground	LA-B - Body ground	Taillights, rear side marker lights and license plate lights drive output	Taillights on	11 to 14 V
4H-30 - Body ground	LA-B - Body ground		Taillights off	Below 1 V
G32-19 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
G32-23 (AHID) - Body ground	BE - Body ground	Auto high beam switch indicator drive output	Engine switch on (IG), auto high beam switch on	Below 1 V
G32-23 (AHID) - Body ground	BE - Body ground	Auto high beam switch indicator drive output	Engine switch on (IG), auto high beam switch off	11 to 14 V
G33-12 (HRY2) - Body ground	BE - Body ground	H-LP RH relay drive output	Light control switch in head position	Below 1 V
G33-12 (HRY2) - Body ground	BE - Body ground	H-LP RH relay drive output	Taillights off	11 to 14 V
G33-13 (DIM) - Body ground	G - Body ground	High beam headlight drive output	Light control switch in head position and dimmer switch in high or high flash position	Below 1 V
G33-13 (DIM) - Body ground	G - Body ground	High beam headlight drive output	Dimmer switch not in high or high flash position	11 to 14 V
G33-16 (HEAD) - Body ground	LG - Body ground	Light control switch head position input	Light control switch in head position	Below 1 V
G33-16 (HEAD) - Body ground	LG - Body ground	Light control switch head position input	Light control switch not in head position	11 to 14 V
G33-23 (CLTB) - G33-25 (CLTE)	BE - GR	Automatic light control sensor power supply output	Engine switch off	Below 1 V
G33-23 (CLTB) - G33-25 (CLTE)	BE - GR	Automatic light control sensor power supply output	Engine switch on (IG)	11 to 14 V
G33-24 (CLTS) - Body ground	R - Body ground	Automatic light control sensor signal input	Engine switch off	Below 1 V
G33-24 (CLTS) - Body ground	R - Body ground	Automatic light control sensor signal input	Engine switch on (IG)	Pulse generation (See waveform 1)
G33-26 (AHBI) - Body ground	B - Body ground	Auto high beam switch signal input	Auto high beam switch on	Below 1 V
G33-26 (AHBI) - Body ground	B - Body ground	Auto high beam switch signal input	Auto high beam switch off	11 to 14 V

(1) Waveform 1

Item	Content
Tester Connection	G33-24 (CLTS) - Body ground
Tool setting	2 V/DIV., 10 ms./DIV.
Condition	Engine switch on (IG)

HINT:

The communication waveform changes according to the surrounding brightness.

CHECK COMBINATION METER ASSEMBLY

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CHECK FORWARD RECOGNITION CAMERA

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CHECK STEERING SENSOR

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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Terminals Of Ecu

Taillight Relay Circuit

Turn Signal Switch Circuit

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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual