Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GXIV
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 06/2021]
Title: LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): TERMINALS OF ECU; 2020 - 2021 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 06/2021]

TERMINALS OF ECU

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

(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

(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

4F-3 - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

4B-1 - Body ground

B - Body ground

Battery power supply

Always

11 to 14 V

4D-1 - Body ground

B-R - Body ground

Battery power supply

Always

11 to 14 V

I86-19 (GND2) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Connect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

4E-17 - Body ground

R - Body ground*2

B - Body ground*3

IG power supply

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

4E-30 - Body ground

SB - Body ground*4

P - Body ground*5

ACC power supply

Ignition switch ACC

11 to 14 V

Ignition switch off

Below 1 V

4E-31 - Body ground

GR - Body ground

Rear door courtesy light switch assembly RH input

Rear door RH open

Below 1 V

Rear door RH closed

11 to 14 V or pulse output (maximum 14 V)*8

4E-36 - Body ground*1

GR - Body ground

Cup holder light (console box pocket garnish) drive output

Cup holder light (console box pocket garnish) off

11 to 14 V

Cup holder light (console box pocket garnish) at full brightness

Below 2.2 V

Cup holder light (console box pocket garnish) dimmer control operating (dimming)

Pulse generation

4E-37 - Body ground*1

Y - Body ground

Center tray illumination light (instrument panel light assembly) drive output

Center tray illumination light (instrument panel light assembly) off

11 to 14 V

Center tray illumination light (instrument panel light assembly) at full brightness

Below 2.2 V

Center tray illumination light (instrument panel light assembly) dimmer control operating (dimming)

Pulse generation

4F-10 - Body ground

R - Body ground

Map light assembly, rear room light (No. 1 room light assembly) and vanity light*6 assembly power supply

DOME CUT relay on

11 to 14 V

DOME CUT relay off

Below 1 V

4F-12 - Body ground

BR - Body ground

Front door unlock detection switch RH input

Front door RH locked

11 to 14 V or pulse output (maximum 14 V)*8

Front door RH unlocked

Below 1 V

4F-13 - Body ground

L - Body ground*4

SB - Body ground*5

Front door unlock detection switch LH input

Front door LH locked

11 to 14 V or pulse output (maximum 14 V)*8

Front door LH unlocked

Below 1 V

4F-14 - Body ground*7

LG - Body ground*4

GR - Body ground*5

Rear door unlock detection switch input

Rear door locked

11 to 14 V or pulse output (maximum 14 V)*8

Rear door unlocked

Below 1 V

4F-24 - Body ground*1

B - Body ground

Door ambient illumination light RH (front door trim board sub-assembly RH) power supply

Always

11 to 14 V

4F-25 - Body ground*1

LG - Body ground

Center tray illumination light (instrument panel light assembly) power supply

Always

11 to 14 V

4F-26 - Body ground*1

W - Body ground

Cup holder light (Console box pocket garnish) power supply

Always

11 to 14 V

4F-27 - Body ground*1

R - Body ground

Door ambient illumination light LH (front door trim board sub-assembly LH) power supply

Always

11 to 14 V

4F-29 - Body ground

V - Body ground

Illuminated entry system drive output

Map light LH and map light RH (map light assembly) and rear room light (No. 1 room light assembly) off (when operated by illuminated entry system)

11 to 14 V

Map light LH and map light RH (map light assembly) and rear room light (No. 1 room light assembly) off (when operated by illuminated entry system)

Below 1 V

4A-19 - Body ground

R - Body ground

No. 1 luggage compartment light assembly power supply

DOME CUT relay on

11 to 14 V

DOME CUT relay off

Below 1 V

4A-24 - Body ground

BR - Body ground

Rear door courtesy light switch assembly LH input

Rear door LH open

Below 1 V

Rear door LH closed

11 to 14 V or pulse output (maximum 14 V)*8

4A-34 - Body ground

LG - Body ground*4

SB - Body ground*5

Back door courtesy light switch (back door lock assembly)*4 or luggage compartment door courtesy light switch (luggage compartment door lock assembly)*5 input

Back door*4 or luggage compartment door*5 open

Below 1 V

Back door*4 or luggage compartment door*5 closed

11 to 14 V or pulse output (maximum 14 V)*8

I85-1 (FLCY) - Body ground

BR - Body ground

Front door courtesy light switch assembly LH input

Front door LH open

Below 1 V

Front door LH closed

11 to 14 V or pulse output (maximum 14 V)*8

I85-6 (FRCY) - Body ground

BR - Body ground*4

SB - Body ground*5

Front door courtesy light switch assembly RH input

Front door RH open

Below 1 V

Front door RH closed

11 to 14 V or pulse output (maximum 14 V)*8

I85-20 (BCYL)*4 or I85-20 (TCYL)*5 - Body ground

Y - Body ground

No. 1 luggage compartment light assembly drive output

No. 1 luggage compartment light assembly off

11 to 14 V

No. 1 luggage compartment light assembly on

Below 1 V

I84-20 (LED1) - Body ground*1

G - Body ground

Door ambient illumination light (door trim board sub-assembly) drive output

Door ambient illumination light (door trim board sub-assembly) off

11 to 14 V

Door ambient illumination light (door trim board sub-assembly) at full brightness

Below 2.2 V

Door ambient illumination light (door trim board sub-assembly) dimmer control operating (dimming)

Pulse generation
  • *1: w/ Ambient Illumination Light
  • *2: w/ Smart Key System
  • *3: w/o Smart Key System
  • *4: for Hatchback
  • *5: for Sedan
  • *6: w/ Vanity Light
  • *7: w/ Unlock Detection Switch
  • *8: Differs depending on the vehicle model

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

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

I1-10 (SWIL) - I1-11 (AGND)

Y - Y*1

Y - W*2

Engine switch illumination drive output

Engine switch illumination on

11 to 14 V

Engine switch illumination off

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