Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001H0R1
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 09/2022]
Title: CRUISE CONTROL: FRONT RADAR SENSOR SYSTEM (for Gasoline Model): TERMINALS OF ECU; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

TERMINALS OF ECU

NOTICE:

  • Turning the ignition switch ON with connectors disconnected may cause DTCs to be stored. Make sure to clear the DTCs after inspection has been performed.
  • Do not apply excessive force to the millimeter wave radar sensor assembly connector.

CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A1-8 (IGB) - A1-1 (SGND)

R - W-B

Power source

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

A1-1 (SGND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(b) Check for pulses according to the value(s) in the table below.

HINT:

If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the millimeter wave radar sensor assembly is suspected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A1-5 (CA1P) - A1-1 (SGND)

LG - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 1)

A1-6 (CA1N) - A1-1 (SGND)

V - W-B

Pulse generation

(See waveform 2)

A1-3 (CA2H) - A1-1 (SGND)

W - W-B

Pulse generation

(See waveform 1)

A1-2 (CA2L) - A1-1 (SGND)

B - W-B

Pulse generation

(See waveform 2)

(1) WAVEFORM 1

Item

Content

Tester Connection
  • Between A1-5 (CA1P) and A1-1 (SGND)
  • Between A1-3 (CA2H) and A1-1 (SGND)

Tool Setting

1 V/DIV., 10 μs/DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

(2) WAVEFORM 2

Item

Content

Tester Connection
  • Between A1-6 (CA1N) and A1-1 (SGND)
  • Between A1-2 (CA2L) and A1-1 (SGND)

Tool Setting

1 V/DIV., 10 μs/DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.