Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001N4PU
Model Year Start: 2021 Model: Corolla Prod Date Range: [04/2020 - 09/2022]
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for HV Model): TERMINALS OF ECU; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]

TERMINALS OF ECU

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

I143-1 (+B) - I143-20 (E)

SB - W-B

Power source (+B)

Power switch off

11 to 14 V

I143-3 (SIG-) - I143-20 (E)

W - W-B

Ground

Always

Below 1 V

I143-4 (IND1) - I143-20 (E)

G - W-B

Manual (SOS) switch red indicator illumination signal

For 2 seconds after power switch turned on (IG)

1 to 8.5 V

Power switch off

Below 1 V

I143-5 (MCVD) - I143-20 (E)

R - W-B

Telephone microphone assembly power supply

Power switch on (ACC)

4 to 6 V

Power switch off

Below 1 V

I143-6 (MCI+) - I143-20 (E)

B - W-B

Receive microphone voice signal

Voice being input to telephone microphone assembly

A waveform synchronized with microphone voice signal is input

I143-7 (MCI-) - I143-20 (E)

W - W-B

Receive microphone voice signal

Always

Below 1 V

I143-13 (GSW) - I143-20 (E)

W - W-B

Collision detection signal

Power switch on (IG)

Pulse generation (Refer to waveform 1)

I143-19 (IG2) - I143-20 (E)

L - W-B

Power source (IG)

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

I143-20 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

I143-21 (SIG1) - I143-3 (SIG-)

L - W

Manual (SOS) switch button condition signal

Manual (SOS) switch not pressed

1.3 to 1.9 V

Manual (SOS) switch pressed

0.5 to 0.8 V

I143-22 (IND2) - I143-20 (E)

GR - W-B

Manual (SOS) switch green indicator illumination signal

For 2 seconds after power switch turned on (IG)

1 to 8.5 V

Power switch off

Below 1 V

I143-23 (SGND) - I143-20 (E)

Shielded - W-B

Shield ground

Always

Below 1 Ω

I143-25 (CANP)

L

CAN communication signal

-

-

I143-26 (CANN)

W

CAN communication signal

-

-

DCM (TELEMATICS TRANSCEIVER)

(a) Oscilloscope waveform:

(1) Waveform 1

Item

Condition

Tester connection

I143-13 (GSW) - I143-20 (E)

Tool setting

5.0 V/DIV., 20 ms/DIV.

Vehicle condition

Power switch on (IG)

RADIO AND DISPLAY RECEIVER ASSEMBLY

Click here 2021 MY Corolla Corolla HV [04/2020 - 06/2021]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for HV Model with Dual Knob Type): TERMINALS OF ECU 2022 MY Corolla Corolla HV [06/2021 - 09/2022]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for HV Model with Dual Knob Type): TERMINALS OF ECU