LIGHTING (EXT): LIGHTING SYSTEM: TERMINALS OF ECU; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM1000000028JPX
Model Year Start: 2023	Model: GR Corolla	Prod Date Range: [11/2022 - ]
Title: LIGHTING (EXT): LIGHTING SYSTEM: TERMINALS OF ECU; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 - ]

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND POWER DISTRIBUTION BOX ASSEMBLY

(a) Disconnect the power distribution box 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)	Terminal Description	Condition	Specified Condition
8A-8 - Body ground	Ground	Always	Below 1 Ω
8D-8 - Body ground	Ground	Always	Below 1 Ω
8M-1 - Body ground	Auxiliary battery power supply	Ignition switch off	11 to 14 V
8J-1 - Body ground	Auxiliary battery power supply	Ignition switch off	11 to 14 V

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
8D-27 - Body ground*6	R shift position switch signal	Ignition switch off, reverse (R) not selected	Below 1 V
8D-27 - Body ground*6	R shift position switch signal	Ignition switch ON, reverse (R) selected	11 to 14 V
8F-9 - Body ground	CXPI communication line	Ignition switch off	Below 1 V
8F-9 - Body ground	CXPI communication line	Ignition switch ON	Pulse generation
8F-2 - Body ground*2	Daytime running light system drive output	Daytime running light system operating	Below 1 V
8F-2 - Body ground*2	Daytime running light system drive output	Daytime running light system not operating	11 to 14 V
8F-3 - Body ground	H-LP LH relay drive output	15 seconds or more after ignition switch turned off Taillights off	9.5 to 14 V
8F-3 - Body ground	H-LP LH relay drive output	Ignition switch ON or within 15 seconds after ignition switch turned off Taillights on	Below 1 V
8F-4 - Body ground	H-LP RH relay drive output	15 seconds or more after ignition switch turned off Taillights off	9.5 to 14 V
8F-4 - Body ground	H-LP RH relay drive output	Ignition switch ON or within 15 seconds after ignition switch turned off Taillights on	Below 1 V
8F-20 - Body ground	Front side marker lights2, parking lights2 and accessory lights*3 drive output	Taillights off	Below 1 V
8F-20 - Body ground		Taillights on	11 to 14 V
8H-7 - Body ground*1	Front fog lights drive output	Taillights on, fog light switch in off position	Below 1 V
8H-7 - Body ground*1	Front fog lights drive output	Taillights on, fog light switch in front position	11 to 14 V
8H-13 - Body ground	Back-up lights drive output	Ignition switch off, reverse (R) not selected	Below 1 V
8H-13 - Body ground	Back-up lights drive output	Ignition switch ON, reverse (R) selected	11 to 14 V
8H-15 - Body ground	Taillights drive output	Taillights off	Below 1 V
8H-15 - Body ground	Taillights drive output	Taillights on	11 to 14 V
I85-8 (CLTB) - I85-21 (CLTE)*5	Automatic light control sensor power supply output	Ignition switch off	Below 1 V
I85-8 (CLTB) - I85-21 (CLTE)*5	Automatic light control sensor power supply output	Ignition switch ON	11 to 14 V
I85-14 (AHBI) - Body ground*4	Auto high beam switch signal input	Auto high beam switch off	11 to 14 V
I85-14 (AHBI) - Body ground*4	Auto high beam switch signal input	Auto high beam switch on	Below 1 V
I85-15 (AHID) - Body ground*4	Auto high beam switch indicator drive output	Ignition switch ON, auto high beam switch off	11 to 14 V
I85-15 (AHID) - Body ground*4	Auto high beam switch indicator drive output	Ignition switch ON, auto high beam switch on	Below 1 V
I85-20 (CLTS) - Body ground*5	Automatic light control sensor signal input	Ignition switch off	Below 1 V
I85-20 (CLTS) - Body ground*5	Automatic light control sensor signal input	Ignition switch ON	Pulse generation (See waveform 1)
I85-22 (DIM) - Body ground*2	High beam headlight drive output	Light control switch in head position and dimmer switch in high or high flash position	Below 1 V
I85-22 (DIM) - Body ground*2	High beam headlight drive output	Dimmer switch not in high or high flash position	11 to 14 V
I85-26 (HEAD) - Body ground	Light control switch head position input	Light control switch not in head position	11 to 14 V
I85-26 (HEAD) - Body ground	Light control switch head position input	Light control switch in head position	Below 1 V

*1: w/ Front Fog Light
*2: for Bulb Type Turn Signal Light
*3: w/ Accessory Light
*4: w/ Automatic High Beam System
*5: w/ Automatic Light Control
*6: for HV Model

(1) Waveform 1

Item	Content
Tester Connection	I85-20 (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

except 12.3 Inch Display: Click here

for 12.3 Inch Display: Click here

CHECK STEERING SENSOR

for HV Model: Click here

for Gasoline Model: Click here

CHECK HYBRID VEHICLE CONTROL ECU (for HV Model)

Click here