Last Modified: 08-22-2025 6.11:8.1.0 Doc ID: RM0000003TPC1U7
Model Year Start: 2026 Model: GR Corolla Prod Date Range: [08/2025 -           ]
Title: AUDIO / VIDEO: ASC SYSTEM: TERMINALS OF ECU; 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 -        ]

TERMINALS OF ECU

NO. 2 STEREO COMPONENT EQUALIZER ASSEMBLY

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I250-1 (CANL)

CAN communication signal

-

-

I250-6 (ACNT)

ASC system control signal

ASC system operating

Below 1 V

ASC system not operating

3.3 V or higher

I250-7 (ACK1)

Serial communication (UART) signal

-

-

I250-8 (CH1+) - I250-28 (GND)

ASC system sound signal

ASC system operating

Pulse generation

I250-9 (CH2+) - I250-28 (GND)

ASC system sound signal

ASC system operating

Pulse generation

I250-10 (CH3+) - I250-28 (GND)

ASC system sound signal

ASC system operating

Pulse generation

I250-12 (CH4+) - I250-28 (GND)

ASC system sound signal

ASC system operating

Pulse generation

I250-14 (+B) - I250-28 (GND)

Power source

Ignition switch off

11 to 14 V

I250-15 (CANH)

CAN communication signal

-

-

I250-21 (ACK2)

Serial communication (UART) signal

-

-

I250-22 (CH1-) - I250-28 (GND)

ASC system sound signal

ASC system operating

Pulse generation

I250-23 (CH2-) - I250-28 (GND)

ASC system sound signal

ASC system operating

Pulse generation

I250-24 (CH3-) - I250-28 (GND)

ASC system sound signal

ASC system operating

Pulse generation

I250-26 (CH4-) - I250-28 (GND)

ASC system sound signal

ASC system operating

Pulse generation

I250-27 (IGP) - I250-28 (GND)

Power source (IG)

Ignition switch ON

11 to 14 V

I250-28 (GND) - Body ground

Ground

Always

Below 1 Ω

STEREO COMPONENT EQUALIZER ASSEMBLY

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

O228-1 (ACK3)

Serial communication (UART) signal

-

-

O228-2 (AS1+) - O228-20 (GND)

ASC system control signal

ASC system operating

Pulse generation

O228-3 (AS2+) - O228-20 (GND)

ASC system sound signal

ASC system operating

Pulse generation

O228-4 (AS3+) - O228-20 (GND)

ASC system sound signal

ASC system operating

Pulse generation

O228-5 (ASG3)

Shield ground

-

-

O228-6 (AS4+) - O228-20 (GND)

ASC system sound signal

ASC system operating

Pulse generation

O228-8 (SCNT) - O228-20 (GND)

ASC system sound signal

ASC system operating

Below 1 V

ASC system not operating

3.3 V or higher

O228-11 (ACK4)

Serial communication (UART) signal

-

-

O228-12 (AS1-) - O228-20 (GND)

ASC system sound signal

ASC system operating

Pulse generation

O228-13 (AS2-) - O228-20 (GND)

ASC system sound signal

ASC system operating

Pulse generation

O228-14 (AS3-) - O228-20 (GND)

ASC system sound signal

ASC system operating

Pulse generation

O228-15 (ASG4)

Shield ground

-

-

O228-16 (AS4-) - O228-20 (GND)

ASC system sound signal

ASC system operating

Pulse generation