Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001AUM2
Model Year Start: 2019 Model: GR Corolla Prod Date Range: [06/2018 - 01/2019]
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): TERMINALS OF ECU; 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]

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

LA-G - 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

4A-30 - Body ground

L - Body ground

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

Taillights on

11 to 14 V

Taillights off

Below 1 V

4B-19 - Body ground

GR - 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

4B-23 - Body ground

LG - Body ground*1

R - Body ground*2

BKUP LP relay drive output

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

4B-31 - Body ground

G - Body ground

H-LP LH relay drive output

  • Engine switch on (IG) or within 15 seconds after engine switch turned off
  • Taillights on

Below 1 V

  • 15 seconds or more after engine switch turned off
  • Taillights off

11 to 14 V

4B-32 - Body ground

L - Body ground

Front side marker lights drive output

Taillights on

11 to 14 V

Taillights off

Below 1 V

4E-40 - Body ground*1

W - Body ground

BKUP LP relay drive output

Engine switch off

Below 1 V

Engine switch on (ACC)

11 to 14 V

4E-52 - Body ground

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

GR - Body ground

Tail signal output

Taillights on

11 to 14 V

Taillights off

Below 1 V

I84-21 (AHID) - Body ground

LG - 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

I85-12 (HRY2) - Body ground

G - Body ground

H-LP RH relay drive output

  • Engine switch on (IG) or within 15 seconds after engine switch turned off
  • Taillights on

Below 1 V

  • 15 seconds or more after engine switch turned off
  • Taillights off

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

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

I85-24 (CLTS) - Body ground

W - Body ground

Automatic light control sensor signal input

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

(See waveform 1)

I85-26 (AHBI) - Body ground

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

I86-19 (GND2) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

  • *1: for CVT
  • *2: for Manual Transaxle

(1) Waveform 1

Item

Content

Tester Connection

I85-24 (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 HEADLIGHT ECU SUB-ASSEMBLY LH

(a) Disconnect the A headlight ECU sub-assembly LH 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

A-4 (IG) - Body ground

-

Ignition power supply

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

A-12 (GND) - Body ground

-

Ground

Always

Below 1 Ω

A-13 (ECUB) - Body ground

-

Battery power supply

  • 15 seconds or more after engine switch turned off
  • Taillights off

Below 1 V

  • Engine switch on (IG) or within 15 seconds after engine switch turned off
  • Taillights on

9.5 to 14 V

(c) Connect the A headlight ECU sub-assembly LH connector.

HINT:

  • Since the A headlight ECU sub-assembly LH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
  • Since the B and C headlight ECU sub-assembly LH connectors are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A-11 (TNS) - Body ground

-

Front turn signal light signal input

Engine switch on (IG), front turn signal light off

Below 1 V

Engine switch on (IG), front turn signal light blinking

11 to 14 V ←→ Below 1 V

A-16 (SBR) - A-15 (SGR)

-

Rear height control sensor sub-assembly LH power supply

Engine switch on (IG)

4.75 to 5.25 V

A-17 (SHRL) - A-15 (SGR)

-

Rear height control sensor sub-assembly LH signal input

Engine switch on (IG), vehicle unloaded, vehicle stopped

Approximately 2.5 V

(value decreases as the front of the vehicle is raised)

A-19 (LINS) - Body ground

-

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

A-20 (LINL) - Body ground

-

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

A-23 (CANL) - Body ground

-

CAN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

A-24 (CANH) - Body ground

-

CAN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

B-2 (LOLED2) - B-3 (LOLED1)

-

Low beam headlights drive output

Low beam headlights off

Below 1 V

Low beam headlights on

10 to 16 V

B-4 (FANB) - B-14 (FANG)

-

Headlight fan power source

Low beam headlights off

Below 1 V

Low beam headlights on

4.75 to 5.25 V

B-9 (ACTBI) - B-17 (ACTGI)

-

Headlight swivel and leveling motor power source

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

B-15 (FANP) - B-14 (FANG)

-

Headlight fan control signal input

Low beam headlights off

Below 1 V

Low beam headlights on

Pulse generation

B-19 (HI_SOL+) - B-11 (HI_SOL-)

-

High beam headlights drive output

High beam headlights off

Below 1 V

High beam headlights on

11 to 14 V

B-20 (TURN+) - B-13 (TURN-)

-

Front turn signal light signal output

Engine switch on (IG), front turn signal light off

Below 1 V

Engine switch on (IG), front turn signal light blinking

11 to 14 V ←→ Below 1 V

C-4 (LINSI) - Body ground

-

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

C-7 (CLL+) - C-8 (CLL-)

-

Parking lights drive output

Parking lights off

Below 1 V

Parking lights on

11 to 14 V

C-13 (LINLI) - Body ground

-

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

CHECK HEADLIGHT ECU SUB-ASSEMBLY RH

(a) Disconnect the A headlight ECU sub-assembly RH 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

A-4 (IG) - Body ground

-

Ignition power supply

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

A-12 (GND) - Body ground

-

Ground

Always

Below 1 Ω

A-13 (ECUB) - Body ground

-

Battery power supply

  • 15 seconds or more after engine switch turned off
  • Taillights off

Below 1 V

  • Engine switch on (IG) or within 15 seconds after engine switch turned off
  • Taillights on

9.5 to 14 V

(c) Connect the A headlight ECU sub-assembly RH connector.

HINT:

  • Since the A headlight ECU sub-assembly RH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
  • Since the B and C headlight ECU sub-assembly RH connectors are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A-11 (TNS) - Body ground

-

Front turn signal light signal input

Engine switch on (IG), front turn signal light off

Below 1 V

Engine switch on (IG), front turn signal light blinking

11 to 14 V ←→ Below 1 V

A-19 (LINS) - Body ground

-

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

A-20 (LINL) - Body ground

-

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

A-23 (CANL) - Body ground

-

CAN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

A-24 (CANH) - Body ground

-

CAN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

B-2 (LOLED2) - B-3 (LOLED1)

-

Low beam headlights drive output

Low beam headlights off

Below 1 V

Low beam headlights on

10 to 16 V

B-4 (FANB) - B-14 (FANG)

-

Headlight fan power source

Low beam headlights off

Below 1 V

Low beam headlights on

4.75 to 5.25 V

B-9 (ACTBI) - B-17 (ACTGI)

-

Headlight swivel and leveling motor power source

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

B-15 (FANP) - B-14 (FANG)

-

Headlight fan control signal input

Low beam headlights off

Below 1 V

Low beam headlights on

Pulse generation

B-19 (HI_SOL+) - B-11 (HI_SOL-)

-

High beam headlights drive output

High beam headlights off

Below 1 V

High beam headlights on

11 to 14 V

B-20 (TURN+) - B-13 (TURN-)

-

Front turn signal light signal output

Engine switch on (IG), front turn signal light off

Below 1 V

Engine switch on (IG), front turn signal light blinking

11 to 14 V ←→ Below 1 V

C-4 (LINSI) - Body ground

-

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

C-7 (CLL+) - C-8 (CLL-)

-

Parking lights drive output

Parking lights off

Below 1 V

Parking lights on

11 to 14 V

C-13 (LINLI) - Body ground

-

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

CHECK COMBINATION METER ASSEMBLY

Click here 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for Gasoline Model): TERMINALS OF ECU

CHECK FORWARD RECOGNITION CAMERA

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

Click here 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): TERMINALS OF ECU