Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000026A83
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM (except TMMMS Made): TERMINALS OF ECU; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND POWER DISTRIBUTION BOX ASSEMBLY

(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

(b) Reconnect the power distribution box assembly connectors.

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

MB-26 (BECU) - Body ground

Auxiliary battery power supply

Ignition switch off*1

Always*2

11 to 14 V

MB-27 (IGR) - Body ground

Ignition power supply (IG signal)

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

MB-13 (GND1) - Body ground

Ground

Always

Below 1 Ω

MB-14 (GND2) - Body ground

Ground

Always

Below 1 Ω

MB-2 (FLCY) - Body ground

Front door courtesy light switch assembly (LH) input

Front door LH closed

10 kΩ or higher

Front door LH open

Below 1 Ω

MB-4 (FRCY) - Body ground

Front door courtesy light switch assembly (RH) input

Front door RH closed

10 kΩ or higher

Front door RH open

Below 1 Ω

MB-6 (LCTY) - Body ground

Rear door courtesy light switch assembly (LH) input

Rear door LH closed

10 kΩ or higher

Rear door LH open

Below 1 Ω

MB-1 (RCTY) - Body ground

Rear door courtesy light switch assembly (RH) input

Rear door RH closed

10 kΩ or higher

Rear door RH open

Below 1 Ω

MB-19 (BCTY) - Body ground*3

Back door courtesy light switch signal

Back door closed (OFF) → open (ON)

10 kΩ or higher → Below 1 Ω

MB-19 (LGCY) - Body ground*4

Luggage compartment door courtesy light switch signal

Luggage compartment door closed (OFF) → open (ON)

10 kΩ or higher → Below 1 Ω

I85-27 (HCTY) - Body ground

Engine hood courtesy switch input

Engine hood open

10 kΩ or higher

Engine hood closed

Below 1 Ω

I85-16 (KSW) - Body ground*5

Unlock warning switch input

Key not in ignition key cylinder

10 kΩ or higher

Key in ignition key cylinder

Below 1 Ω

  • *1: for HV Model
  • *2: for Gasoline Model
  • *3: except Sedan
  • *4: for Sedan
  • *5: w/o Smart Key System

(d) Install the main body ECU (multiplex network body ECU) to power distribution box assembly.

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; POWER DISTRIBUTION: MAIN BODY ECU: INSTALLATION

(e) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I85-9 (LSFL) - Body ground

Front door LH unlock detection switch input

Front door LH unlocked

Below 1 V

Front door LH locked

Pulse generation

I85-3 (LSFR) - Body ground

Front door RH unlock detection switch input

Front door RH unlocked

Below 1 V

Front door RH locked

Pulse generation

I85-10 (LSWL) - Body ground

Rear door LH unlock detection switch input

Rear door LH unlocked

Below 1 V

Rear door LH locked

Pulse generation

D49-23 (LSWR) - Body ground

Rear door RH unlock detection switch input

Rear door RH unlocked

Below 1 V

Rear door RH locked

Pulse generation

I85-28 (L2) - Body ground

Driver door or front passenger door* key-linked lock input

Driver door or front passenger door* key cylinder turned to lock position

Below 1 V

Driver door and front passenger door* key cylinder off

Pulse generation

I85-4 (UL3) - Body ground

Driver door key-linked unlock input

Driver door key cylinder turned to unlock position

Below 1 V

Driver door key cylinder off

Pulse generation

I231-25 (UL2) - Body ground*

Front passenger door key-linked unlock input

Front passenger door key cylinder turned to unlock position

Below 1 V

Front passenger door key cylinder off

Pulse generation

8D-14 (SH) - Body ground

Security horn assembly drive

Security horn assembly sounding

(Theft deterrent system in alarm sounding state)

Pulse generation

(Below 1 V ← → 11 to 14 V)

8F-10 (HORN) - Body ground

Vehicle horns drive

Vehicle horns sounding

(Theft deterrent system in alarm sounding state)

Pulse generation

(Below 1 V ← → 11 to 14 V)

I85-7 (IND) - Body ground

Security indicator illumination

Security indicator light illuminated

(Theft deterrent system in alarm sounding state)

Pulse generation → Below 2 V

  • *: w/o Wireless Door Lock Control System

CHECK COMBINATION METER ASSEMBLY

for 12.3 Inch Display: Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for 12.3 Inch Display): HOW TO PROCEED WITH TROUBLESHOOTING

except 12.3 Inch Display: Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (except 12.3 Inch Display): HOW TO PROCEED WITH TROUBLESHOOTING

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

for HV Model: Click here 2023 MY Corolla Corolla HV [09/2022 - 11/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): TERMINALS OF ECU

for Gasoline Model: Click here 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function (Gasoline Model, except TMMMS Made)): TERMINALS OF ECU