LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): TERMINALS OF ECU; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001GLRL
Model Year Start: 2020	Model: GR Corolla	Prod Date Range: [01/2019 - 09/2022]
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): TERMINALS OF ECU; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

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
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
4F-3 - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

(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
4A-10 - Body ground	LA-G - Body ground5 G - Body ground6	Back-up lights drive output	Engine switch off, reverse (R) not selected	Below 1 V
4A-10 - Body ground	LA-G - Body ground5 G - Body ground6	Back-up lights drive output	Engine switch on (IG), reverse (R) selected	11 to 14 V
4A-30 - Body ground	L - Body ground	Taillights, rear side marker lights and license plate lights drive output	Taillights on	11 to 14 V
4A-30 - Body ground	L - Body ground		Taillights off	Below 1 V
4B-19 - Body ground	GR - Body ground	BKUP LP relay drive output	Engine switch off, reverse (R) not selected	Below 1 V
4B-19 - Body ground	GR - Body ground	BKUP LP relay drive output	Engine switch on (IG), reverse (R) selected	11 to 14 V
4B-23 - Body ground	LG - Body ground1 R - Body ground2	BKUP LP relay drive output	Engine switch off	Below 1 V
4B-23 - Body ground	LG - Body ground1 R - Body ground2	BKUP LP relay drive output	Engine switch on (IG)	11 to 14 V
4B-31 - Body ground	G - Body ground	H-LP LH relay drive output	Engine switch on (IG) or within 15 seconds after engine switch turned off Taillights on	Below 1 V
4B-31 - Body ground	G - Body ground	H-LP LH relay drive output	15 seconds or more after engine switch turned off Taillights off	11 to 14 V
4B-32 - Body ground	L - Body ground	Front side marker lights and accessory lights*3 drive output	Taillights on	11 to 14 V
4B-32 - Body ground	L - Body ground		Taillights off	Below 1 V
4E-40 - Body ground*1	W - Body ground5 R - Body ground6	BKUP LP relay drive output	Engine switch off	Below 1 V
4E-40 - Body ground*1	W - Body ground5 R - Body ground6	BKUP LP relay drive output	Engine switch on (ACC)	11 to 14 V
4E-52 - Body ground*4	R - Body ground	FR FOG relay drive output	Taillights on, fog light switch in front position	Below 1 V
4E-52 - Body ground*4	R - Body ground	FR FOG relay drive output	Taillights on, fog light switch in off position	11 to 14 V
4F-11 - Body ground*4	GR - Body ground	Tail signal output	Taillights on	11 to 14 V
4F-11 - Body ground*4	GR - Body ground	Tail signal output	Taillights off	Below 1 V
I84-21 (AHID) - Body ground	LG - Body ground	Auto high beam switch indicator drive output	Engine switch on (IG), auto high beam switch on	Below 1 V
I84-21 (AHID) - Body ground	LG - Body ground	Auto high beam switch indicator drive output	Engine switch on (IG), auto high beam switch off	11 to 14 V
I85-12 (HRY2) - Body ground	G - Body ground	H-LP RH relay drive output	Engine switch on (IG) or within 15 seconds after engine switch turned off Taillights on	Below 1 V
I85-12 (HRY2) - Body ground	G - Body ground	H-LP RH relay drive output	15 seconds or more after engine switch turned off Taillights off	11 to 14 V
I85-16 (HEAD) - Body ground	L - Body ground	Light control switch head position input	Light control switch in head position	Below 1 V
I85-16 (HEAD) - Body ground	L - Body ground	Light control switch head position input	Light control switch not in head position	11 to 14 V
I85-23 (CLTB) - I85-25 (CLTE)	R - B	Automatic light control sensor power supply output	Engine switch on (IG)	11 to 14 V
I85-24 (CLTS) - Body ground	W - Body ground	Automatic light control sensor signal input	Engine switch off	Below 1 V
I85-24 (CLTS) - Body ground	W - Body ground	Automatic light control sensor signal input	Engine switch on (IG)	Pulse generation (See waveform 1)
I85-26 (AHBI) - Body ground	L - Body ground	Auto high beam switch signal input	Auto high beam switch on	Below 1 V
I85-26 (AHBI) - Body ground	L - Body ground	Auto high beam switch signal input	Auto high beam switch off	11 to 14 V
I86-19 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

*1: for CVT
*2: for Manual Transaxle
*3: w/ Accessory Light
*4: w/ Front Fog Light
*5: for Hatchback
*6: for Sedan

(1) Waveform 1

Item	Content
Tester Connection	I85-24 (CLTS) - Body ground
Tool setting	2 V/DIV., 10 ms./DIV.
Condition	Engine switch on (IG)

HINT:

The communication waveform changes according to the surrounding brightness.

CHECK HEADLIGHT ECU SUB-ASSEMBLY LH

(a) Disconnect the A headlight ECU sub-assembly LH connector.

(b) Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A-4 (IG) - Body ground	-	Ignition power supply	Engine switch off	Below 1 V
A-4 (IG) - Body ground	-	Ignition power supply	Engine switch on (IG)	11 to 14 V
A-12 (GND) - Body ground	-	Ground	Always	Below 1 Ω
A-13 (ECUB) - Body ground	-	Battery power supply	15 seconds or more after engine switch turned off Taillights off	Below 1 V
A-13 (ECUB) - Body ground	-	Battery power supply	Engine switch on (IG) or within 15 seconds after engine switch turned off Taillights on	9.5 to 14 V

HINT:

Since the A headlight ECU sub-assembly LH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
Since the B and C headlight ECU sub-assembly LH connectors are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A-11 (TNS) - Body ground	-	Front turn signal light signal input	Engine switch on (IG), front turn signal light off	Below 1 V
A-11 (TNS) - Body ground	-	Front turn signal light signal input	Engine switch on (IG), front turn signal light blinking	11 to 14 V ←→ Below 1 V
A-16 (SBR) - A-15 (SGR)	-	Rear height control sensor sub-assembly LH power supply	Engine switch on (IG)	4.75 to 5.25 V
A-17 (SHRL) - A-15 (SGR)	-	Rear height control sensor sub-assembly LH signal input	Engine switch on (IG), vehicle unloaded, vehicle stopped	Approximately 2.5 V (value decreases as the front of the vehicle is raised)
A-19 (LINS) - Body ground	-	LIN communication line	Engine switch off	Below 1 V
A-19 (LINS) - Body ground	-	LIN communication line	Engine switch on (IG)	Pulse generation
A-20 (LINL) - Body ground	-	LIN communication line	Engine switch off	Below 1 V
A-20 (LINL) - Body ground	-	LIN communication line	Engine switch on (IG)	Pulse generation
A-23 (CANL) - Body ground	-	CAN communication line	Engine switch off	Below 1 V
A-23 (CANL) - Body ground	-	CAN communication line	Engine switch on (IG)	Pulse generation
A-24 (CANH) - Body ground	-	CAN communication line	Engine switch off	Below 1 V
A-24 (CANH) - Body ground	-	CAN communication line	Engine switch on (IG)	Pulse generation
B-2 (LOLED2) - B-3 (LOLED1)	-	Low beam headlights drive output	Low beam headlights off	Below 1 V
B-2 (LOLED2) - B-3 (LOLED1)	-	Low beam headlights drive output	Low beam headlights on	10 to 16 V
B-4 (FANB) - B-14 (FANG)	-	Headlight fan power source	Low beam headlights off	Below 1 V
B-4 (FANB) - B-14 (FANG)	-	Headlight fan power source	Low beam headlights on	4.75 to 5.25 V
B-9 (ACTBI) - B-17 (ACTGI)	-	Headlight swivel and leveling motor power source	Engine switch off	Below 1 V
B-9 (ACTBI) - B-17 (ACTGI)	-	Headlight swivel and leveling motor power source	Engine switch on (IG)	11 to 14 V
B-15 (FANP) - B-14 (FANG)	-	Headlight fan control signal input	Low beam headlights off	Below 1 V
B-15 (FANP) - B-14 (FANG)	-	Headlight fan control signal input	Low beam headlights on	Pulse generation
B-19 (HI_SOL+) - B-11 (HI_SOL-)	-	High beam headlights drive output	High beam headlights off	Below 1 V
B-19 (HI_SOL+) - B-11 (HI_SOL-)	-	High beam headlights drive output	High beam headlights on	11 to 14 V
B-20 (TURN+) - B-13 (TURN-)	-	Front turn signal light signal output	Engine switch on (IG), front turn signal light off	Below 1 V
B-20 (TURN+) - B-13 (TURN-)	-	Front turn signal light signal output	Engine switch on (IG), front turn signal light blinking	11 to 14 V ←→ Below 1 V
C-4 (LINSI) - Body ground	-	LIN communication line	Engine switch off	Below 1 V
C-4 (LINSI) - Body ground	-	LIN communication line	Engine switch on (IG)	Pulse generation
C-7 (CLL+) - C-8 (CLL-)	-	Parking lights drive output	Parking lights off	Below 1 V
C-7 (CLL+) - C-8 (CLL-)	-	Parking lights drive output	Parking lights on	11 to 14 V
C-13 (LINLI) - Body ground	-	LIN communication line	Engine switch off	Below 1 V
C-13 (LINLI) - Body ground	-	LIN communication line	Engine switch on (IG)	Pulse generation

CHECK HEADLIGHT ECU SUB-ASSEMBLY RH

(a) Disconnect the A headlight ECU sub-assembly RH connector.

(b) Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A-4 (IG) - Body ground	-	Ignition power supply	Engine switch off	Below 1 V
A-4 (IG) - Body ground	-	Ignition power supply	Engine switch on (IG)	11 to 14 V
A-12 (GND) - Body ground	-	Ground	Always	Below 1 Ω
A-13 (ECUB) - Body ground	-	Battery power supply	15 seconds or more after engine switch turned off Taillights off	Below 1 V
A-13 (ECUB) - Body ground	-	Battery power supply	Engine switch on (IG) or within 15 seconds after engine switch turned off Taillights on	9.5 to 14 V

HINT:

Since the A headlight ECU sub-assembly RH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
Since the B and C headlight ECU sub-assembly RH connectors are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A-11 (TNS) - Body ground	-	Front turn signal light signal input	Engine switch on (IG), front turn signal light off	Below 1 V
A-11 (TNS) - Body ground	-	Front turn signal light signal input	Engine switch on (IG), front turn signal light blinking	11 to 14 V ←→ Below 1 V
A-19 (LINS) - Body ground	-	LIN communication line	Engine switch off	Below 1 V
A-19 (LINS) - Body ground	-	LIN communication line	Engine switch on (IG)	Pulse generation
A-20 (LINL) - Body ground	-	LIN communication line	Engine switch off	Below 1 V
A-20 (LINL) - Body ground	-	LIN communication line	Engine switch on (IG)	Pulse generation
A-23 (CANL) - Body ground	-	CAN communication line	Engine switch off	Below 1 V
A-23 (CANL) - Body ground	-	CAN communication line	Engine switch on (IG)	Pulse generation
A-24 (CANH) - Body ground	-	CAN communication line	Engine switch off	Below 1 V
A-24 (CANH) - Body ground	-	CAN communication line	Engine switch on (IG)	Pulse generation
B-2 (LOLED2) - B-3 (LOLED1)	-	Low beam headlights drive output	Low beam headlights off	Below 1 V
B-2 (LOLED2) - B-3 (LOLED1)	-	Low beam headlights drive output	Low beam headlights on	10 to 16 V
B-4 (FANB) - B-14 (FANG)	-	Headlight fan power source	Low beam headlights off	Below 1 V
B-4 (FANB) - B-14 (FANG)	-	Headlight fan power source	Low beam headlights on	4.75 to 5.25 V
B-9 (ACTBI) - B-17 (ACTGI)	-	Headlight swivel and leveling motor power source	Engine switch off	Below 1 V
B-9 (ACTBI) - B-17 (ACTGI)	-	Headlight swivel and leveling motor power source	Engine switch on (IG)	11 to 14 V
B-15 (FANP) - B-14 (FANG)	-	Headlight fan control signal input	Low beam headlights off	Below 1 V
B-15 (FANP) - B-14 (FANG)	-	Headlight fan control signal input	Low beam headlights on	Pulse generation
B-19 (HI_SOL+) - B-11 (HI_SOL-)	-	High beam headlights drive output	High beam headlights off	Below 1 V
B-19 (HI_SOL+) - B-11 (HI_SOL-)	-	High beam headlights drive output	High beam headlights on	11 to 14 V
B-20 (TURN+) - B-13 (TURN-)	-	Front turn signal light signal output	Engine switch on (IG), front turn signal light off	Below 1 V
B-20 (TURN+) - B-13 (TURN-)	-	Front turn signal light signal output	Engine switch on (IG), front turn signal light blinking	11 to 14 V ←→ Below 1 V
C-4 (LINSI) - Body ground	-	LIN communication line	Engine switch off	Below 1 V
C-4 (LINSI) - Body ground	-	LIN communication line	Engine switch on (IG)	Pulse generation
C-7 (CLL+) - C-8 (CLL-)	-	Parking lights drive output	Parking lights off	Below 1 V
C-7 (CLL+) - C-8 (CLL-)	-	Parking lights drive output	Parking lights on	11 to 14 V
C-13 (LINLI) - Body ground	-	LIN communication line	Engine switch off	Below 1 V
C-13 (LINLI) - Body ground	-	LIN communication line	Engine switch on (IG)	Pulse generation

CHECK COMBINATION METER ASSEMBLY

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CHECK FORWARD RECOGNITION CAMERA

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CHECK STEERING SENSOR

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