LIGHTING (EXT): LIGHTING SYSTEM: TERMINALS OF ECU; 2021 MY Camry [10/2020

Last Modified: 11-20-2023	6.11:8.1.0	Doc ID: RM100000001R67V
Model Year Start: 2021	Model: Camry	Prod Date Range: [10/2020 - 08/2021]
Title: LIGHTING (EXT): LIGHTING SYSTEM: TERMINALS OF ECU; 2021 MY Camry [10/2020 - 08/2021]

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
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

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
3A-40 - Body ground	LA-G - Body ground	BKUP LP relay drive output	Ignition switch off	Below 1 V
3A-40 - Body ground	LA-G - Body ground	BKUP LP relay drive output	Ignition switch ACC	11 to 14 V
3C-18 - Body ground*1	SB - Body ground	Parking brake switch input	Parking brake switch on	Below 1 V
3C-18 - Body ground*1	SB - Body ground	Parking brake switch input	Parking brake switch off	11 to 14 V
3C-19 - Body ground	BE - Body ground	BKUP LP relay drive output	Ignition switch off, shift lever not in R	Below 1 V
3C-19 - Body ground	BE - Body ground	BKUP LP relay drive output	Ignition switch ON, shift lever in R	11 to 14 V
3C-23 - Body ground	LA-P - Body ground	BKUP LP relay drive output	Ignition switch off	Below 1 V
3C-23 - Body ground	LA-P - Body ground	BKUP LP relay drive output	Ignition switch ON	11 to 14 V
3C-28 - Body ground	LA-GR - Body ground2 GR - Body ground3	Daytime running light system drive output	Daytime running light system operating	Below 1 V
3C-28 - Body ground	LA-GR - Body ground2 GR - Body ground3	Daytime running light system drive output	Daytime running light system not operating	11 to 14 V
3C-31 - Body ground	V - Body ground	H-LP LH relay drive output	Light control switch in head position	Below 1 V
3C-31 - Body ground	V - Body ground	H-LP LH relay drive output	Taillights off	11 to 14 V
3C-32 - Body ground	LA-B - Body ground	Parking lights and front side marker lights drive output	Taillights on	11 to 14 V
3C-32 - Body ground	LA-B - Body ground	Parking lights and front side marker lights drive output	Taillights off	Below 1 V
3D-10 - Body ground	LG - Body ground	Back-up lights drive output	Ignition switch off, shift lever not in R	Below 1 V
3D-10 - Body ground	LG - Body ground	Back-up lights drive output	Ignition switch ON, shift lever in R	11 to 14 V
3D-30 - Body ground	LA-B - Body ground	Taillights, rear side marker lights and license plate lights drive output	Taillights on	11 to 14 V
3D-30 - Body ground	LA-B - Body ground		Taillights off	Below 1 V
K51-14 (LLEW) - Body ground	GR - Body ground	Light control LED ECU LH signal input	Ignition switch ON, taillights off	11 to 14 V
K51-14 (LLEW) - Body ground	GR - Body ground	Light control LED ECU LH signal input	Ignition switch ON, light control switch in head position	Pulse generation
K51-15 (RLEW) - Body ground	R - Body ground	Light control LED ECU RH signal input	Ignition switch ON, taillights off	11 to 14 V
K51-15 (RLEW) - Body ground	R - Body ground	Light control LED ECU RH signal input	Ignition switch ON, light control switch in head position	Pulse generation
K51-19 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
K51-23 (AHID) - Body ground*4	BE - Body ground	Auto high beam switch indicator drive output	Ignition switch ON, auto high beam switch on	Below 1 V
K51-23 (AHID) - Body ground*4	BE - Body ground	Auto high beam switch indicator drive output	Ignition switch ON, auto high beam switch off	11 to 14 V
K52-12 (HRY2) - Body ground	BE - Body ground	H-LP RH relay drive output	Light control switch in head position	Below 1 V
K52-12 (HRY2) - Body ground	BE - Body ground	H-LP RH relay drive output	Taillights off	11 to 14 V
K52-13 (DIM) - Body ground	G - Body ground	High beam headlight drive output	Light control switch in head position and dimmer switch in high or high flash position	Below 1 V
K52-13 (DIM) - Body ground	G - Body ground	High beam headlight drive output	Dimmer switch not in high or high flash position	11 to 14 V
K52-16 (HEAD) - Body ground	LG - Body ground	Light control switch head position input	Light control switch in head position	Below 1 V
K52-16 (HEAD) - Body ground	LG - Body ground	Light control switch head position input	Light control switch not in head position	11 to 14 V
K52-23 (CLTB) - K52-25 (CLTE)	BE - GR	Automatic light control sensor power supply output	Ignition switch off	Below 1 V
K52-23 (CLTB) - K52-25 (CLTE)	BE - GR	Automatic light control sensor power supply output	Ignition switch ON	11 to 14 V
K52-24 (CLTS) - Body ground	R - Body ground	Automatic light control sensor signal input	Ignition switch off	Below 1 V
K52-24 (CLTS) - Body ground	R - Body ground	Automatic light control sensor signal input	Ignition switch ON	Pulse generation (See waveform 1)
K52-26 (AHBI) - Body ground*4	B - Body ground	Auto high beam switch signal input	Auto high beam switch on	Below 1 V
K52-26 (AHBI) - Body ground*4	B - Body ground	Auto high beam switch signal input	Auto high beam switch off	11 to 14 V

*1: w/o Electric Parking Brake
*2: for Bulb Type Turn Signal Light
*3: for LED Type Turn Signal Light
*4: w/ Automatic High Beam System

(1) Waveform 1

Item	Content
Tester Connection	K52-24 (CLTS) - Body ground
Tool setting	2 V/DIV., 10 ms./DIV.
Condition	Ignition switch ON

HINT:

The communication waveform changes according to the surrounding brightness.

CHECK COMBINATION METER ASSEMBLY

Click here

CHECK FORWARD RECOGNITION CAMERA (w/ Automatic High Beam System)

Click here

CHECK STEERING SENSOR

Click here