Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM1000000026A7L
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM (for 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 INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

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

HINT:

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

Related Data List Item

I86-19 (GND2) - Body ground

Ground

Always

Below 1 Ω

-

(c) Reconnect the instrument panel junction block assembly connectors.

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

HINT:

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

Related Data List Item

MB-31 (BECU) - Body ground

Auxiliary battery power supply

Power switch off*1

Always*2

11 to 14 V

-

MB-32 (IG) - Body ground

Ignition power supply (IG signal)

Ignition switch off

Below 1 V

IG SW

Ignition switch ON

11 to 14 V

MB-30 (ACC) - Body ground

Ignition power supply (ACC signal)

Ignition switch off

Below 1 V

ACC SW

Ignition switch ACC

11 to 14 V

MB-11 (GND1) - Body ground

Ground

Always

Below 1 Ω

-

I85-1 (FLCY) - Body ground

Front door courtesy light switch assembly (for LH) input

Front door LH closed

10 kΩ or higher

FL Door Courtesy SW

Front door LH open

Below 1 Ω

I85-6 (FRCY) - Body ground

Front door courtesy light switch assembly (for RH) input

Front door RH closed

10 kΩ or higher

FR Door Courtesy SW

Front door RH open

Below 1 Ω

MB-13 (LCTY) - Body ground

Rear door courtesy light switch assembly (for LH) input

Rear door LH closed

10 kΩ or higher

RL Door Courtesy SW

Rear door LH open

Below 1 Ω

MB-2 (RCTY) - Body ground

Rear door courtesy light switch assembly (for RH) input

Rear door RH closed

10 kΩ or higher

RR Door Courtesy SW

Rear door RH open

Below 1 Ω

I85-30 (HCTY) - Body ground

Engine hood courtesy switch input

Engine hood open

10 kΩ or higher

Hood Courtesy SW

Engine hood closed

Below 1 Ω

MB-4 (LGCY) - Body ground*3

Luggage compartment door courtesy light switch input

Luggage compartment door closed

10 kΩ or higher

Luggage Courtesy SW

Luggage compartment door open

Below 1 Ω

MB-4 (BCTY) - Body ground*4

Back door courtesy light switch input

Back door closed

10 kΩ or higher

Back Door Courtesy SW

Back door open

Below 1 Ω

MB-14 (TRLY) - Body ground

Taillight relay drive output

Power switch off*1

Always*2

11 to 14 V

-
  • *1: for HV Model
  • *2: for Gasoline Model
  • *3: for Sedan
  • *4: for Hatchback

(e) Install the main body ECU (multiplex network body ECU) to instrument panel junction block assembly.

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

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

Related Data List Item

4F-13 (LSFL) - Body ground

Front door LH unlock detection switch input

Front door LH unlocked

Below 1 V

FL Door Lock Pos SW

Front door LH locked

11 to 14 V or pulse output (maximum 14 V)*1

4F-12 (LSFR) - Body ground

Front door RH unlock detection switch input

Front door RH unlocked

Below 1 V

FR Door Lock Pos SW

Front door RH locked

11 to 14 V or pulse output (maximum 14 V)*1

I84-18 (L2) - Body ground

Driver door key-linked lock input

Driver door key cylinder turned to lock position

Below 1 V

Door Key SW-Lock

Driver door key cylinder off

11 to 14 V

I84-17 (UL3) - Body ground

Driver door key-linked unlock input

Driver door key cylinder turned to unlock position

Below 1 V

D Door Key SW-UL

Driver door key cylinder off

11 to 14 V

4F-14 (LSR) - Body ground

Rear door LH/RH unlock detection switch input

Rear door LH or RH unlocked

Below 1 V
  • RR-Door Lock Pos SW
  • RL-Door Lock Pos SW

Rear door LH and RH locked

11 to 14 V or pulse output (maximum 14 V)*1

4B-26 (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)

-

4B-27 (HORN) - Body ground

Vehicle horn drives

Vehicle horn sounding

(Theft deterrent system in alarm sounding state)

Pulse generation

(Below 1 V ← → 11 to 14 V)

-

4B-31 (HRLY) - Body ground*2

H-LP LH relay drive output

Low beams blinking

(Theft deterrent system in alarm sounding state)

Pulse generation (Below 1 V ← → 11 to 14 V)

-

I85-12 (HRY2) - Body ground*2

H-LP RH relay drive output

Low beams blinking

(Theft deterrent system in alarm sounding state)

Pulse generation (Below 1 V ← → 11 to 14 V)

-

4F-29 (ILE) - Body ground*2

Interior lights drive output

Interior lights illuminated

(Theft deterrent system in alarm sounding state)

Below 1 V

-
  • *1: Differs depending on the vehicle model
  • *2: w/ Door Control Switch Assembly