Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM100000001L7KZ
Model Year Start: 2020 Model: Camry Prod Date Range: [09/2019 -           ]
Title: LIGHTING (INT): LIGHTING SYSTEM: TERMINALS OF ECU; 2020 - 2024 MY Camry [09/2019 -        ]

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

3B-3 - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

3C-1 - Body ground

LG - Body ground

Battery power supply

Always

11 to 14 V

3F-1 - Body ground

W - Body ground

Battery power supply

Always

11 to 14 V

K51-19 (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

3A-17 - Body ground

R - Body ground*1

LA-R - Body ground*2

IG power supply

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

3A-30 - Body ground

LG - Body ground

ACC power supply

Ignition switch ACC

11 to 14 V

Ignition switch off

Below 1 V

3A-31 - Body ground

V - 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

3A-36 - Body ground*3

W - Body ground

Footwell light LH (No. 1 interior illumination light assembly) drive output

Footwell light LH (No. 1 interior illumination light assembly) off

11 to 14 V

Footwell light LH (No. 1 interior illumination light assembly) dimmer control operating (dimming)

Pulse generation

Footwell light LH (No. 1 interior illumination light assembly) at full brightness

Below 2.2 V

3A-37 - Body ground*3

B - Body ground

Footwell light RH (No. 1 interior illumination light assembly) drive output

Footwell light RH (No. 1 interior illumination light assembly) off

11 to 14 V

Footwell light RH (No. 1 interior illumination light assembly) dimmer control operating (dimming)

Pulse generation

Footwell light RH (No. 1 interior illumination light assembly) at full brightness

Below 2.2 V

3B-10 - Body ground

B - Body ground

Map light (roof console box sub-assembly), room light assembly*4, spot light assembly*5 and vanity light assembly LH and RH*6 power supply

DOME CUT relay on

11 to 14 V

DOME CUT relay off

Below 1 V

3B-12 - Body ground

GR - Body ground

Front door unlock detection switch RH input

Front door RH locked

11 to 14 V

Front door RH unlocked

Below 1 V

3B-13 - Body ground

W - Body ground

Front door unlock detection switch LH input

Front door LH locked

11 to 14 V

Front door LH unlocked

Below 1 V

3B-14 - Body ground

GR - Body ground

Rear door unlock detection switch LH input

Rear door LH locked

11 to 14 V

Rear door LH unlocked

Below 1 V

3B-24 - Body ground*2

LA-LG - Body ground

Ignition key cylinder light (transponder key coil) power supply

Always

11 to 14 V

3B-24 - Body ground*7

LG - Body ground

Instrument panel ambient illumination light (instrument panel light assembly) power supply

Always

11 to 14 V

3B-25 - Body ground*3

BE - Body ground

Footwell light RH (No. 1 interior illumination light assembly) power supply

Always

11 to 14 V

3B-26 - Body ground*8

R - Body ground

Inside handle illumination light (No. 1 interior illumination light assembly) power supply

Always

11 to 14 V

3B-27 - Body ground*3

B - Body ground

Footwell light LH (No. 1 interior illumination light assembly) power supply

Always

11 to 14 V

3B-29 - Body ground

LA-G - Body ground

Illuminated entry system drive output

Map light LH and map light RH (map light (roof console box sub-assembly))*5, room light assembly*4 and ignition key cylinder light (transponder key coil)*2 off (when operated by illuminated entry system)

11 to 14 V

Map light LH and map light RH (map light (roof console box sub-assembly))*5, room light assembly*4 and ignition key cylinder light (transponder key coil)*2 on (when operated by illuminated entry system)

Below 1 V

3D-19 - Body ground

LA-B - Body ground

No. 1 luggage compartment light assembly and courtesy light assembly LH and RH power supply

DOME CUT relay on

11 to 14 V

DOME CUT relay off

Below 1 V

3D-24 - Body ground

G - 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

3D-34 - Body ground

LA-GR - Body ground

Luggage compartment door courtesy light switch (luggage compartment door lock assembly) input

Luggage compartment door open

Below 1 V

Luggage compartment door closed

11 to 14 V

K51-20 (LSWR) - Body ground

L - Body ground

Rear door unlock detection switch RH input

Rear door RH locked

11 to 14 V

Rear door RH unlocked

Below 1 V

K52-1 (FLCY) - Body ground

W - 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

K52-2 (FLCL) - Body ground*9

G - Body ground

Courtesy light assembly LH drive output

Courtesy light assembly LH off

11 to 14 V

Courtesy light assembly LH on

Below 1 V

K52-3 (FRCL) - Body ground*9

L - Body ground

Courtesy light assembly RH drive output

Courtesy light assembly RH off

11 to 14 V

Courtesy light assembly RH on

Below 1 V

K52-6 (FRCY) - Body ground

BE - Body ground

Front door courtesy light switch assembly RH input

Front door RH open

Below 1 V

Front door RH closed

11 to 14 V

K52-20 (TCYL) - Body ground

GR - 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

K53-20 (LED1) - Body ground*7

W - Body ground

Instrument panel ambient illumination light (instrument panel light assembly) drive output

Instrument panel ambient illumination light (instrument panel light assembly) off

11 to 14 V

Instrument panel ambient illumination light (instrument panel light assembly) dimmer control operating (dimming)

Pulse generation

Instrument panel ambient illumination light (instrument panel light assembly) at full brightness

Below 2.2 V

K53-21 (LED2) - Body ground*8

R - Body ground

Inside handle illumination light (No. 1 interior illumination light assembly) drive output

Inside handle illumination light (No. 1 interior illumination light assembly) off

11 to 14 V

Inside handle illumination light (No. 1 interior illumination light assembly) dimmer control operating (dimming)

Pulse generation

Inside handle illumination light (No. 1 interior illumination light assembly) at full brightness

Below 2.2 V
  • *1: w/ Smart Key System
  • *2: w/o Smart Key System
  • *3: w/ Footwell Light
  • *4: w/ Room Light (for Bulb Type)
  • *5: w/ Room Light (for LED Type)
  • *6: w/ Vanity Light
  • *7: w/ Instrument Panel Ambient Illumination Light
  • *8: w/ Inside Handle Illumination Light
  • *9: w/ Courtesy Light

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

K62-10 (SWIL) - K62-11 (AGND)

W - BE

Engine switch illumination drive output

Engine switch illumination on

11 to 14 V

Engine switch illumination off

Below 1 V