Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM10000000257A7
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (except 12.3 Inch Display): TERMINALS OF ECU; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]

TERMINALS OF ECU

COMBINATION METER ASSEMBLY

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

for TMC Made

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I4-1 (EP) - Body ground

Ground

Always

Below 1 Ω

I4-2 (ES) - Body ground

Ground

Always

Below 1 Ω

I4-5 (B) - Body ground

Power source for auxiliary battery
  • Ignition switch off*1
  • Always*2

11 to 14 V

I4-6 (IG+) - Body ground

Power source for IG relay

IG OFF → IG ON
  • Below 1 V → 11 to 14 V*1
  • Below 1 V → 10.5 to 16 V*2

I4-8 (+S) - Body ground

Vehicle speed output signal

Ignition switch ON, wheel being rotated

Pulse generation

(See waveform 1)

I4-9 (S) - Body ground*1

Engine oil pressure signal

Engine started → not started

11 to 14 V → Below 1 V

I4-11 (SW) - Body ground*2

Brake fluid level warning switch signal

Ignition switch ON, brake fluid level not low (brake warning light/red (malfunction) off) → low (brake warning light/red (malfunction) on)

11 to 14 V → Below 1 V

I4-12 (HZSW) - Body ground

Hazard warning signal switch signal

Hazard warning signal switch off → on

11 to 14 V → Below 1 V

I4-13 (WLVL) - Body ground*3

Washer fluid level signal

Ignition switch ON, washer fluid level not low → low

11 to 14 V → Below 1 V

I4-14 (OILW) - Body ground

Engine oil level sensor signal

Ignition switch ON, engine oil level not low → low

Below 1 V → 11 to 14 V

I4-23 (ILL-) - Body ground

Illumination signal

Taillights off → on

Below 1 V → Pulse generation

I4-25 (SI) - Body ground

Vehicle speed input signal

Ignition switch ON, wheel being rotated

Pulse generation

(See waveform 1)

I4-27 (VCM) - Body ground*2

Vacuum warning switch signal

Engine started, vacuum warning switch off (brake warning light/red (malfunction) off) → on (brake warning light/red (malfunction) on)

11 to 14 V → Below 1 V

I4-28 (LST1) - Body ground*1

Fuel lid status signal

Ignition switch OFF

11 to 14 V

The following message (interrupt display) being displayed on the multi-information display:

  • "Ready to Refuel"

Pulse generation

(See waveform 4)

The following message (interrupt display) being displayed on the multi-information display:

  • "Close Fuel Lid"

Pulse generation

(See waveform 5)

I5-2 (B) - Body ground

Power source for auxiliary battery
  • Ignition switch off*1
  • Always*2

11 to 14 V

I5-5 (LL) - Body ground

Front/side turn signal flasher signal

(LH side)

Turn indicator light (LH) blinking

11 to 14 V ←→ Below 1 V

Turn indicator light (LH) off

Below 1 V

I5-6 (LR) - Body ground

Front/side turn signal flasher signal

(RH side)

Turn indicator light (RH) blinking

11 to 14 V ←→ Below 1 V

Turn indicator light (RH) off

Below 1 V

I5-7 (FR) - I5-25 (FE&B)

Fuel level signal

Ignition switch ON, fuel receiver gauge indicates F → E (fuel level warning light on)

Pulse generation

(See waveform 2)

I5-10 (TC) - Body ground

Tail cancel switch signal

Ignition switch ON, light control rheostat knob not fully turned upward (Tail cancel switch off) → fully turned upward (Tail cancel switch on)

Below 1 V → 4 to 6 V

I5-11 (SW1) - Body ground

Light control rheostat (Power source)

Ignition switch ON

4 to 6 V

I5-12 (MSTI) - Body ground

Steering pad switch without touch detection function signal

Ignition switch ON, up, down, left and right switches on steering pad switch not pushed

4.8 to 5.2 V

I5-14 (CANL)

CAN communication signal

-

-

I5-15 (TX-)

Local bus communication signal

-

-

I5-21 (TRNR) - Body ground

Rear turn signal flasher signal

(RH side)

Turn indicator light (RH) blinking

11 to 14 V ←→ Below 1 V

Turn indicator light (RH) off

Below 1 V

I5-22 (TRNL) - Body ground

Rear turn signal flasher signal

(LH side)

Turn indicator light (LH) blinking

11 to 14 V ←→ Below 1 V

Turn indicator light (LH) off

Below 1 V

I5-23 (FV) - Body ground

Power source for fuel sender gauge

Ignition switch ON

Pulse generation

(See waveform 3)

I5-25 (FE&B) - Body ground

Ground for fuel sender gauge

Always

Below 1 Ω

I5-26 (SW3) - Body ground

Ground for trip switch

Always

Below 1 Ω

I5-28 (SW2) - Body ground

Light control rheostat signal

Ignition switch ON, light control rheostat knob fully turned downward → fully turned upward

Below 1 V → 4 to 6 V

(Gradually change)

I5-29 (MSM+) - Body ground

Steering pad switch without touch detection function signal

Ignition switch ON, OK and back switches on steering pad switch not pushed

4.8 to 5.2 V

I5-31 (CANH)

CAN communication signal

-

-

I5-32 (TX+)

Local bus communication signal

-

-
  • *1: for HV Model
  • *2: for Gasoline Model
  • *3: w/ Washer Fluid Level Warning

for TMMMS Made

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I4-1 (B) - Body ground

Battery

Always

11 to 14 V

I4-9 (CANH)

CAN communication line

-

-

I4-10 (MSCL)*1

Local bus communication line

-

-

I4-11 (SW3) - Body ground

Light control rheostat (Ground)

Always

Below 1 Ω

I4-14 (FV) - Body ground

Fuel sender gauge (Power source)

Ignition switch ON

Pulse generation

(See waveform 2)

I4-15 (MSTI) - Body ground

Steering pad switch signal

Ignition switch ON, up, down, right and left switches on steering pad switch not pushed

4.8 to 5.2 V

I4-16 (SW2) - Body ground

Light control rheostat signal

Ignition switch ON, light control rheostat knob fully turned downward → fully turned upward

Below 1 V → 4 to 6 V

(Gradually change)

I4-17 (TC) - Body ground

Tail cancel switch signal

Ignition switch ON, light control rheostat knob not fully turned upward (Tail cancel switch off) → fully turned upward (Tail cancel switch on)

Below 1 V → 4 to 6 V

I4-19 (EP) - Body ground

Ground

Always

Below 1 Ω

I4-20 (SI) - Body ground

Speed signal for other system (Input)

Ignition switch ON, wheel being rotated

Pulse generation

(See waveform 1)

I4-22 (B) - Body ground

Battery

Always

11 to 14 V

I4-23 (ES) - Body ground

Ground

Always

Below 1 Ω

I4-24 (FE&B) -Body ground

Fuel sender gauge (Ground)

Always

Below 1 Ω

I4-25 (CANL)

CAN communication line

-

-

I4-27 (MSCH)*1

Local bus communication line

-

-

I4-31 (FR) - I4-24 (FE&B)

Fuel level signal

Ignition switch ON, fuel level full → low (fuel level warning light on)

Pulse generation

(See waveform 3)

I4-32 (MSM+) - Body ground

Steering pad switch signal

Ignition switch ON, OK and back switches on steering pad switch not pushed

4.8 to 5.2 V

I4-34 (SW1) - Body ground

Light control rheostat (Power source)

Ignition switch ON

4 to 6 V

I4-35 (ILL-) - Body ground

Illumination signal

Taillights off → on

Below 1 V → Pulse generation

I4-36 (+S) - Body ground

Speed signal for other systems (Output)

Ignition switch ON, wheel being rotated

Pulse generation

(See waveform 1)

I4-38 (IG+) - Body ground

Ignition switch signal

Ignition switch off → Ignition switch ON

Below 1 V → 11 to 14 V

I5-1 (LL) - Body ground

LH turn switch signal

LH turn indicator light off → blinking

Below 1 V → 11 to 14 V ←→ Below 1 V

I5-2 (LR) - Body ground

RH turn switch signal

RH turn indicator light off → blinking

Below 1 V → 11 to 14 V ←→ Below 1 V

I5-5 (TRNL) - Body ground

LH turn switch signal

LH turn indicator light off → blinking

Below 1 V → 11 to 14 V ←→ Below 1 V

I5-6 (TRNR) - Body ground

RH turn switch signal

RH turn indicator light off → blinking

Below 1 V → 11 to 14 V ←→ Below 1 V

I5-7 (LP) - Body ground

Security indicator signal

Security indicator light off → blinking

Below 2 V → Pulse generation

I5-14 (WLVL) - Body ground*2

Washer fluid level signal

Ignition switch ON, washer fluid level not low → low

11 to 14 V → Below 1 V

I5-16 (SW) - Body ground

Brake fluid level signal

Ignition switch ON, brake fluid level not low (brake warning light off) → low (brake warning light on)

11 to 14 V → Below 1 V

I5-17 (HAZ) - Body ground

Hazard warning signal switch signal

Hazard warning signal switch off → pushed

11 to 14 V → Below 1 V

I5-19 (RCSB) - Body ground

Rear center seat belt warning signal

Ignition switch ON, rear center seat belt unfastened → fastened

Below 1 V → 11 to 14 V

I5-23 (S) - Body ground*3

Engine oil pressure signal

Engine started → not started

11 to 14 V → Below 1 V

I5-24 (INT) - Body ground*4

Tire pressure warning system signal

Ignition switch ON, OK switch on steering pad switch not pushed

8 to 15 V

I5-31 (OILW) - Body ground*5

Engine oil level signal

Ignition switch ON, engine oil level not low → low

Below 1 V → 11 to 14 V

I5-32 (VCM) - Body ground

Vacuum warning switch signal

Engine started, vacuum warning switch off (brake warning light off) → on (brake warning light on)

11 to 14 V → Below 1 V

I5-35 (RRSB) - Body ground

Rear right seat belt warning signal

Ignition switch ON, rear right seat belt unfastened → fastened

Below 1 V → 11 to 14 V

I5-36 (RLSB) - Body ground

Rear left seat belt warning signal

Ignition switch ON, rear left seat belt unfastened → fastened

Below 1 V → 11 to 14 V
  • *1: w/ Audio Tab Display
  • *2: w/ Washer Fluid Level Warning
  • *3: for 2ZR-FAE
  • *4: w/ Tire Pressure Warning System
  • *5: for M20A-FKS

  • Waveform 1:

    Item

    Condition

    Tester connection

    for TMC Made

    • I4-8 (+S) - Body ground
    • I4-25 (SI) - Body ground

    for TMMMS Made

    • I4-36 (+S) - Body ground
    • I4-20 (SI) - Body ground

    Tool setting

    5 V/DIV., 20 ms./DIV.

    Condition

    Ignition switch ON, wheel being rotated

    HINT:

    When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

  • Waveform 2:

    Item

    Condition

    Tester connection

    for TMC Made

    • I5-7 (FR) - I5-25 (FE&B)

    for TMMMS Made

    • I4-31 (FR) - I4-24 (FE&B)

    Tool setting

    2.5 V/DIV., 20 ms./DIV.

    Condition

    Ignition switch ON, fuel receiver gauge indicates F → E (fuel level warning light on)

    HINT:

    (A) varies depending on the fuel level.

    for TMC Made

    • Fuel level full: 4.0 to 4.6 V
    • Fuel level low (fuel level warning light on): 0.3 to 0.9 V

    for TMMMS Made

    • Fuel level full: 4.0 to 4.6 V
    • Fuel level low (fuel level warning light on): 0.3 to 1.1 V

  • Waveform 3:

    Item

    Condition

    Tester connection

    for TMC Made

    • I5-23 (FV) - Body ground

    for TMMMS Made

    • I4-14 (FV) - Body ground

    Tool setting

    2.5 V/DIV., 20 ms./DIV.

    Condition

    Ignition switch ON

    Specified Condition

    4.5 to 5.5 V

  • Waveform 4:

    Item

    Condition

    Tester connection

    I4-28 (LST1) - Body ground

    Tool setting

    5 V/DIV., 20 ms./DIV.

    Condition

    The following message (interrupt display) being displayed on the multi-information display:

    • "Ready to Refuel"

  • Waveform 5:

    Item

    Condition

    Tester connection

    I4-28 (LST1) - Body ground

    Tool setting

    5 V/DIV., 20 ms./DIV.

    Condition

    The following message (interrupt display) being displayed on the multi-information display:

    • "Close Fuel Lid"

    HINT:

    This waveform is output when the fuel lid opener switch is operated if the fuel lid is open and any of the following conditions are met:

    • The vehicle has been driven for 1 km (0.6 mile) or more at a speed of 50 km/h (31 mph) or more.
    • 30 minutes or more have elapsed since the fuel lid opener switch was operated.