LIGHTING (EXT): LIGHTING SYSTEM (for HV Model): TERMINALS OF ECU; 2021 MY Corolla Corolla HV [04/2020

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001O7KE
Model Year Start: 2021	Model: Corolla	Prod Date Range: [04/2020 - 06/2021]
Title: LIGHTING (EXT): LIGHTING SYSTEM (for HV Model): TERMINALS OF ECU; 2021 MY Corolla Corolla HV [04/2020 - 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
4B-1 - Body ground	B - Body ground	Auxiliary battery power supply	Power switch off	11 to 14 V
4D-1 - Body ground	B-R - Body ground	Auxiliary battery power supply	Power switch off	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	G - Body ground	Back-up lights drive output	Power switch off, reverse (R) not selected	Below 1 V
4A-10 - Body ground	G - Body ground	Back-up lights drive output	Power 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		Taillight off	Below 1 V
4B-19 - Body ground	LG - Body ground	BKUP LP relay drive output	Power switch off, reverse (R) not selected	Below 1 V
4B-19 - Body ground	LG - Body ground	BKUP LP relay drive output	Power switch on (IG), reverse (R) selected	11 to 14 V
4B-28 - Body ground	P - Body ground	Daytime running light system drive output	Daytime running light system operating	Below 1 V
4B-28 - Body ground	P - Body ground	Daytime running light system drive output	Daytime running light system not operating	11 to 14 V
4B-31 - Body ground	G - Body ground	H-LP LH relay drive output	Light control switch in head position	Below 1 V
4B-31 - Body ground	G - Body ground	H-LP LH relay drive output	Taillight off	11 to 14 V
4B-32 - Body ground	L - Body ground	Front side marker lights and parking lights drive output	Taillights on	11 to 14 V
4B-32 - Body ground	L - Body ground	Front side marker lights and parking lights drive output	Taillight off	Below 1 V
I84-21 (AHID) - Body ground*1	LG - Body ground	Auto high beam switch indicator drive output	Power switch on (IG), auto high beam switch on	Below 1 V
I84-21 (AHID) - Body ground*1	LG - Body ground	Auto high beam switch indicator drive output	Power 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	Light control switch in head position	Below 1 V
I85-12 (HRY2) - Body ground	G - Body ground	H-LP RH relay drive output	Taillight off	11 to 14 V
I85-13 (DIM) - Body ground	Y - 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
I85-13 (DIM) - Body ground	Y - Body ground	High beam headlight drive output	Dimmer switch not in high or high flash position	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)*2	R - B	Automatic light control sensor power supply output	Power switch on (IG)	11 to 14 V
I85-24 (CLTS) - Body ground*2	W - Body ground	Automatic light control sensor signal input	Power switch off	Below 1 V
I85-24 (CLTS) - Body ground*2	W - Body ground	Automatic light control sensor signal input	Power switch on (IG)	Pulse generation (See waveform 1)
I85-26 (AHBI) - Body ground*1	L - Body ground	Auto high beam switch signal input	Auto high beam switch on	Below 1 V
I85-26 (AHBI) - Body ground*1	L - Body ground	Auto high beam switch signal input	Auto high beam switch off	11 to 14 V
I86-14 (LLEW) - Body ground	L - Body ground	Light control ECU signal input	Power switch on (IG), taillight off	11 to 14 V
I86-14 (LLEW) - Body ground	L - Body ground	Light control ECU signal input	Power switch on (IG), light control switch in head position	Pulse generation
I86-15 (RLEW) - Body ground	B - Body ground	Light control ECU signal input	Power switch on (IG), taillight off	11 to 14 V
I86-15 (RLEW) - Body ground	B - Body ground	Light control ECU signal input	Power switch on (IG), light control switch in head position	Pulse generation
I86-19 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

*1: w/ Automatic High Beam System
*2: w/ Automatic Light Control

(1) Waveform 1

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

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

CHECK HYBRID VEHICLE CONTROL ECU

for Nickel Metal Hydride Battery: Click here

for Lithium-ion Battery: Click here