Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001AULM
Model Year Start: 2019 Model: GR Corolla Prod Date Range: [06/2018 - 09/2022]
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): B242F; Open in B Power Line; 2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022]

DTC

B242F

Open in B Power Line

DESCRIPTION

The headlight ECU sub-assembly operates using the power source voltage input from the IG terminal and ECUB terminal.

The power source voltage of the ECUB terminal is supplied when the main body ECU (multiplex network body ECU) turns the ECUB power supply relay (H-LP LH relay and H-LP RH relay) to ON.

The headlight ECU sub-assembly compares the power source voltage supply condition of the IG terminal and ECUB terminal and monitors the result.

AFS

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B242F

Open in B Power Line

Detection condition:

  • The engine switch is on (IG).

Malfunction status:

  • No power source voltage supplied to ECUB terminal while power source voltage being supplied to IG terminal

Malfunction duration:

  • 10 seconds or more
  • Headlight ECU sub-assembly LH
  • Headlight unit assembly LH
  • Harness or connector
  • No. 1 integration relay
  • Instrument panel junction block assembly
  • Main body ECU (multiplex network body ECU)

AFS

AFS (Sub)

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B242F

Open in B Power Line

Detection condition:

  • The engine switch is on (IG).

Malfunction status:

  • No power source voltage supplied to ECUB terminal while power source voltage being supplied to IG terminal

Malfunction duration:

  • 10 seconds or more
  • Headlight ECU sub-assembly RH
  • Headlight unit assembly RH
  • Harness or connector
  • No. 1 integration relay
  • Main body ECU (multiplex network body ECU)

AFS (Sub)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

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  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

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  • When replacing the headlight ECU sub-assembly LH, always replace it with a new one. If a headlight ECU sub-assembly LH which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

PROCEDURE

1.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / AFS or AFS (Sub) / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > AFS > Clear DTCs

Body Electrical > AFS (Sub) > Clear DTCs

NEXT

2.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Wait 10 seconds or more.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / AFS or AFS (Sub) / Trouble Codes.

(f) Check for DTCs.

Body Electrical > AFS > Trouble Codes

Body Electrical > AFS (Sub) > Trouble Codes

OK:

DTC B242F is not output.

Result

Proceed to

OK

A

NG (DTC output from headlight ECU sub-assembly LH)

B

NG (DTC output from headlight ECU sub-assembly RH)

C
A

USE SIMULATION METHOD TO CHECK

C

GO TO STEP 11

B

3.

INSPECT HEADLIGHT UNIT ASSEMBLY LH (HEADLIGHT CORD)

*1

Headlight Unit Assembly LH (Headlight Cord)

-

-

*a

Component without harness connected

(to Headlight ECU Sub-assembly LH)

*b

Component without harness connected

(to Wire Harness)

(a) Remove the headlight unit assembly LH.

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(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A23-1 - A-13 (ECUB)

Always

Below 1 Ω

A23-4 - A-12 (GND)

Always

Below 1 Ω
NG

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OK

4.

INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH (ECUB TERMINAL VOLTAGE)

*a

Front view of wire harness connector

(to Headlight ECU Sub-assembly LH)

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

(b) Connect the A23 headlight unit assembly LH connector.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A-13 (ECUB) - Body ground

Engine switch on (IG)

9.5 to 14 V
NG

GO TO STEP 6

OK

5.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-12 (GND) - Body ground

Always

Below 1 Ω
OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

INSPECT NO. 1 INTEGRATION RELAY

(a) Remove the No. 1 integration relay.

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(b) Inspect the No. 1 integration relay.

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NG

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OK

7.

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT UNIT ASSEMBLY LH (HEADLIGHT CORD))

(a) Disconnect the A23 headlight unit assembly LH connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1B-1 - A23-1

Always

Below 1 Ω

1B-1 or A23-1 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - NO. 1 INTEGRATION RELAY)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

1A-5 - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 4B instrument panel junction block assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1B-2 - 4B-31

Always

Below 1 Ω

1B-2 or 4B-31 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

10.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

-

-

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

4B-31 - MB-15 (HRLY)

Always

Below 1 Ω
OK

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NG

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11.

INSPECT HEADLIGHT UNIT ASSEMBLY RH (HEADLIGHT CORD)

*1

Headlight Unit Assembly RH (Headlight Cord)

-

-

*a

Component without harness connected

(to Headlight ECU Sub-assembly RH)

*b

Component without harness connected

(to Wire Harness)

(a) Remove the headlight unit assembly RH.

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(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A22-1 - A-13 (ECUB)

Always

Below 1 Ω

A22-4 - A-12 (GND)

Always

Below 1 Ω
NG

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OK

12.

INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH (ECUB TERMINAL VOLTAGE)

*a

Front view of wire harness connector

(to Headlight ECU Sub-assembly RH)

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

(b) Connect the A22 headlight unit assembly RH connector.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A-13 (ECUB) - Body ground

Engine switch on (IG)

9.5 to 14 V
NG

GO TO STEP 14

OK

13.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-12 (GND) - Body ground

Always

Below 1 Ω
OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.

INSPECT NO. 1 INTEGRATION RELAY

(a) Remove the No. 1 integration relay.

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(b) Inspect the No. 1 integration relay.

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NG

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OK

15.

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT UNIT ASSEMBLY RH (HEADLIGHT CORD))

(a) Disconnect the A22 headlight unit assembly RH connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1A-12 - A22-1

Always

Below 1 Ω

1A-12 or A22-1 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

16.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - NO. 1 INTEGRATION RELAY)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

1B-8 - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

17.

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the I85 main body ECU (multiplex network body ECU) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1A-11 - I85-12 (HRY2)

Always

Below 1 Ω

1A-11 or I85-12 (HRY2) - Body ground

Always

10 kΩ or higher
OK

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NG

REPAIR OR REPLACE HARNESS OR CONNECTOR