Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000002579F
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 -           ]
Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for 12.3 Inch Display): TERMINALS OF ECU; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]

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.

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

Always

11 to 14 V

I4-6 (IG+) - Body ground

Power source for IG relay

IG OFF → IG ON

Below 1 V → 10.5 to 16 V

I4-8 (+S) - Body ground

Vehicle speed output signal

Ignition switch ON, wheel being rotated

Pulse generation

(See waveform 1)

I4-11 (SW) - Body ground

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*

Washer fluid level signal

Ignition switch ON, washer fluid level not low → low

11 to 14 V → Below 1 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

Vacuum warning switch signal

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

11 to 14 V → Below 1 V

I5-2 (B) - Body ground

Power source for auxiliary battery

Always

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 (IG), 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 (IG)

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

I5-13 (ODO) - Body ground

ODO/TRIP switch signal

Ignition switch ON, ODO/TRIP 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)

I5-24 (FR2) - 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)

I5-25 (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 (IG), 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

-

-
  • *: w/ Washer Fluid Level Warning

  • Waveform 1:

    Item

    Condition

    Tester connection
    • I4-8 (+S) - Body ground
    • I4-25 (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
    • I5-7 (FR) - I5-25 (FE&B)
    • I5-7 (FR) - I5-25 (FE&B)
    • I5-24 (FR2) - I5-25 (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.

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

  • Waveform 3:

    Item

    Condition

    Tester connection

    I5-23 (FV) - Body ground

    Tool setting

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

    Condition

    Ignition switch ON

    Specified Condition

    4.5 to 5.5 V