Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001H6OF
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 06/2021]
Title: NETWORKING: LIN COMMUNICATION SYSTEM (for Gasoline Model): TERMINALS OF ECU; 2020 - 2021 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 06/2021]

TERMINALS OF ECU

CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Disconnect the MB main body ECU (multiplex network body ECU) connector.

Click here 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

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

HINT:

Measure the values on the wire harness side with the connectors disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

MB-11 (GND1) - Body ground

-

Ground

Always

Below 1 Ω

MB-31 (BECU) - Body ground

-

Battery power supply

Always

11 to 14 V

MB-30 (ACC) - Body ground

-

ACC power supply

Ignition switch ACC

11 to 14 V

Ignition switch off

Below 1 V

MB-32 (IG) - Body ground

-

IG power supply

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

(c) Reconnect the MB main body ECU (multiplex network body ECU) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

4A-25 - Body ground

B - Body ground*1

GR - Body ground*2

LIN communication line

Ignition switch ON

Pulse generation

4F-17 - Body ground*3

GR - Body ground

LIN communication line

Ignition switch ON

Pulse generation

  • *1: for Hatchback
  • *2: for Sedan
  • *3: w/ Sliding Roof System

CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (DRIVER DOOR)

(a) Disconnect the L2 power window regulator motor assembly (driver door) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

L2-2 (B) - Body ground

L - Body ground

Battery power supply

Always

11 to 14 V

L2-1 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the L2 power window regulator motor assembly (driver door) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

L2-9 (LIN) - Body ground

B - Body ground*1

W - Body ground*2

LIN communication line

Ignition switch ON

Pulse generation

  • *1: for Hatchback
  • *2: for Sedan

CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (FRONT PASSENGER DOOR)

(a) Disconnect the K2 power window regulator motor assembly (front passenger door) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

K2-2 (B) - Body ground

LA-L - Body ground

Battery power supply

Always

11 to 14 V

K2-1 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the K2 power window regulator motor assembly (front passenger door) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

K2-9 (LIN) - Body ground

W - Body ground

LIN communication line

Ignition switch ON

Pulse generation

CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR RH DOOR)

(a) Disconnect the M2 power window regulator motor assembly (rear RH door) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

M2-2 (B) - Body ground

LA-R - Body ground

Battery power supply

Always

11 to 14 V

M2-1 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the M2 power window regulator motor assembly (rear RH door) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

M2-9 (LIN) - Body ground

LG - Body ground

LIN communication line

Ignition switch ON

Pulse generation

CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR LH DOOR)

(a) Disconnect the N2 power window regulator motor assembly (rear LH door) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

N2-2 (B) - Body ground

LA-R - Body ground

Battery power supply

Always

11 to 14 V

N2-1 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the N2 power window regulator motor assembly (rear LH door) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

N2-9 (LIN) - Body ground

LG - Body ground

LIN communication line

Ignition switch ON

Pulse generation

CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) (w/ Sliding Roof System)

(a) Disconnect the T12 sliding roof ECU (sliding roof drive gear sub-assembly) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

T12-1 (B) - Body ground

LA-L - Body ground

Battery power supply

Always

11 to 14 V

T12-2 (E) - Body ground

LA - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the T12 sliding roof ECU (sliding roof drive gear sub-assembly) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

T12-7 (MPX1) - Body ground

SB - Body ground

LIN communication line

Ignition switch ON

Pulse generation

CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Disconnect the L7 multiplex network master switch assembly connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

L7-11 (B) - Body ground

B - Body ground

Battery power supply

Always

11 to 14 V

L7-12 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the L7 multiplex network master switch assembly connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

L7-17 (LIN1) - Body ground

LG - Body ground

LIN communication line

Ignition switch ON

Pulse generation

L7-16 (LIN2) - Body ground

B - Body ground*1

W - Body ground*2

LIN communication line

Ignition switch ON

Pulse generation

  • *1: for Hatchback
  • *2: for Sedan

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (w/ Smart Key System)

(a) Disconnect the I1 certification ECU (smart key ECU assembly) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

I1-3 (+B) - Body ground

GR - Body ground

Battery power supply

Always

11 to 14 V

I1-18 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the I1 certification ECU (smart key ECU assembly) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

I1-14 (LIN) - Body ground

BR - Body ground*1

V - Body ground*2

LIN communication line

Ignition switch ON

Pulse generation

  • *1: for Hatchback
  • *2: for Sedan

CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) (w/ Smart Key System)

(a) Disconnect the I59 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

I59-7 (B) - Body ground

L - Body ground

Battery power supply

Always

11 to 14 V

I59-1 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the I59 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

I59-5 (LIN) - Body ground

V - Body ground*1

G - Body ground*2

LIN communication line

Ignition switch ON

Pulse generation

  • *1: for Hatchback
  • *2: for Sedan

CHECK ID CODE BOX (IMMOBILISER CODE ECU) (w/ Smart Key System)

(a) Disconnect the I20 ID code box (immobiliser code ECU) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

I20-5 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

I20-1 (+B) - Body ground

B - Body ground*1

L - Body ground*2

+B power supply

Always

11 to 14 V

  • *1: for Hatchback
  • *2: for Sedan

(c) Reconnect the I20 ID code box (immobiliser code ECU) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

I20-2 (LIN1) - Body ground

B - Body ground*1

P - Body ground*2

LIN communication line

Ignition switch ON

Pulse generation

  • *1: for Hatchback
  • *2: for Sedan