Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001GM3H
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 03/2019]
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model without AFS): TERMINALS OF ECU; 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 03/2019]

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

4B-1 - Body ground

B - Body ground

Battery power supply

Always

11 to 14 V

4D-1 - Body ground

B-R - Body ground

Battery power supply

Always

11 to 14 V

4F-3 - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(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

4A-10 - Body ground

G - Body ground

Back-up lights drive output

Ignition switch off, reverse (R) not selected

Below 1 V

Ignition switch ON, reverse (R) selected

11 to 14 V

4A-30 - Body ground

L - Body ground

Taillights, rear side marker lights and license plate lights drive output

Taillights on

11 to 14 V

Taillight off

Below 1 V

4B-19 - Body ground

GR - Body ground

BKUP LP relay drive output

Ignition switch off, reverse (R) not selected

Below 1 V

Ignition switch ON, reverse (R) selected

11 to 14 V

4B-23 - Body ground

LG - Body ground*2

R - Body ground*3

BKUP LP relay drive output

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

4B-28 - Body ground

P - 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

4B-31 - Body ground

G - Body ground

H-LP LH relay drive output

Light control switch in head position

Below 1 V

Taillight off

11 to 14 V

4B-32 - Body ground

L - Body ground

Front side marker lights, parking lights and accessory lights*7 drive output

Taillights on

11 to 14 V

Taillight off

Below 1 V

4E-38 - Body ground*1

SB - Body ground

Parking brake switch input

Ignition switch ON, parking brake switch on

Below 1 V

Ignition switch ON, parking brake switch off

11 to 14 V

4E-40 - Body ground*2

R - Body ground

BKUP LP relay drive output

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

4E-52 - Body ground*4

R - Body ground

FR FOG relay drive output

Taillights on, fog light switch in front position

Below 1 V

Taillights on, fog light switch in off position

11 to 14 V

4F-11 - Body ground*4

GR - Body ground

Tail signal output

Taillights on

11 to 14 V

Taillights off

Below 1 V

I84-21 (AHID) - Body ground*5

LG - Body ground

Auto high beam switch indicator drive output

Ignition switch ON, auto high beam switch on

Below 1 V

Ignition switch ON, auto high beam switch off

11 to 14 V

I85-12 (HRY2) - Body ground

G - Body ground

H-LP RH relay drive output

Light control switch in head position

Below 1 V

Taillight off

11 to 14 V

I85-13 (DIM) - Body ground

Y - 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

I85-16 (HEAD) - Body ground

L - 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

I85-23 (CLTB) - I85-25 (CLTE)

R - B

Automatic light control sensor power supply output

Ignition switch ON

11 to 14 V

I85-24 (CLTS) - Body ground

W - Body ground

Automatic light control sensor signal input

Ignition switch off

Below 1 V

Ignition switch ON

Pulse generation

(See waveform 1)

I85-26 (AHBI) - Body ground*5

L - 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

I86-14 (LLEW) - Body ground*6

L - Body ground

Light control ECU signal input

Ignition switch ON, taillight off

11 to 14 V

Ignition switch ON, light control switch in head position

Pulse generation

I86-15 (RLEW) - Body ground*6

B - Body ground

Light control ECU signal input

Ignition switch ON, taillight off

11 to 14 V

Ignition switch ON, light control switch in head position

Pulse generation

I86-19 (GND2) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω
  • *1: w/o Electric Parking Brake System
  • *2: for CVT
  • *3: for Manual Transaxle
  • *4: w/ Front Fog Light
  • *5: w/ Automatic High Beam System
  • *6: for LED Type Turn Signal Light
  • *7: w/ Accessory Light

(1) Waveform 1

Item

Content

Tester Connection

I85-24 (CLTS) - Body ground

Tool setting

2 V/DIV., 10 ms./DIV.

Condition

Ignition switch ON

HINT:

The communication waveform changes according to the surrounding brightness.

CHECK COMBINATION METER ASSEMBLY

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Click here 2019 - 2021 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 06/2021]; CRUISE CONTROL: FRONT CAMERA SYSTEM (for Gasoline Model): TERMINALS OF ECU

CHECK STEERING SENSOR

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