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

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

(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

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

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

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

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

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

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

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

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

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

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

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

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

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

Click here

CHECK FORWARD RECOGNITION CAMERA

Click here

CHECK STEERING SENSOR

Click here

    Taillight Relay Circuit

    Turn Signal Switch Circuit

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