Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GLXT
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 09/2022]
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): B2452; Abnormal Height Sensor Data at Initialization; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

DTC

B2452

Abnormal Height Sensor Data at Initialization

DESCRIPTION

The headlight ECU sub-assembly LH stores this DTC if the value from the rear height control sensor sub-assembly LH is out of range when performing initialization of the headlight ECU sub-assembly LH, such as when the vehicle is not level or jacked up.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2452

Abnormal Height Sensor Data at Initialization

Detection condition:

  • The engine switch is on (IG).

Malfunction status:

  • Abnormal rear height control sensor sub-assembly LH value detected during initialization

Malfunction duration:

  • -
  • Vehicle condition when initializing
  • Rear height control sensor sub-assembly LH
  • Harness or connector
  • Headlight unit assembly LH
  • Headlight ECU sub-assembly LH

AFS

WIRING DIAGRAM

for Hatchback

for Sedan

CAUTION / NOTICE / HINT

NOTICE:

  • 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.

    Click here 2019 - 2021 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 06/2021]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): INITIALIZATION 2022 MY Corolla Corolla Hatchback GR Corolla [06/2021 - 09/2022]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): INITIALIZATION

  • If any of the following are performed, it is necessary to initialize the headlight ECU sub-assembly LH.

    Click here 2019 - 2021 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 06/2021]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): INITIALIZATION 2022 MY Corolla Corolla Hatchback GR Corolla [06/2021 - 09/2022]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): INITIALIZATION

    • Replacement of the rear height control sensor sub-assembly LH
    • Removal/installation of the rear height control sensor sub-assembly LH
    • Work that changes the vehicle height such as replacement of suspension components
  • 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.

INITIALIZATION HEADLIGHT ECU SUB-ASSEMBLY LH

(a) Perform initialization of the headlight ECU sub-assembly LH.

Click here 2019 - 2021 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 06/2021]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): INITIALIZATION 2022 MY Corolla Corolla Hatchback GR Corolla [06/2021 - 09/2022]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): INITIALIZATION

NEXT

2.

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 / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > AFS > Clear DTCs

NEXT

3.

CHECK FOR 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 / Trouble Codes.

(e) Check for DTCs.

Body Electrical > AFS > Trouble Codes

OK:

DTC B2452 is not output.

OK

END (INITIALIZATION WAS NOT COMPLETED)
NG

4.

CHECK REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH

(a) Check the installation condition of the rear height control sensor sub-assembly LH.

OK:

Rear height control sensor sub-assembly LH is installed correctly.

NG

INSTALL PARTS CORRECTLY

OK

5.

INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH

(a) Remove the rear height control sensor sub-assembly LH.

Click here 2019 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 09/2022]; LIGHTING (EXT): HEIGHT CONTROL SENSOR: REMOVAL

(b) Inspect the rear height control sensor sub-assembly LH.

Click here 2019 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 09/2022]; LIGHTING (EXT): HEIGHT CONTROL SENSOR: INSPECTION

NG

REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH

OK

6.

CHECK HARNESS AND CONNECTOR (REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH - 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:

for Hatchback

Tester Connection

Condition

Specified Condition

Q2-3 (SHB) - A23-5

Always

Below 1 Ω

Q2-2 (SHRR) - A23-6

Always

Below 1 Ω

Q2-1 (SHG) - A23-2

Always

Below 1 Ω

Q2-3 (SHB) or A23-5 - Body ground

Always

10 kΩ or higher

Q2-2 (SHRR) or A23-6 - Body ground

Always

10 kΩ or higher

for Sedan

Tester Connection

Condition

Specified Condition

O134-3 (SHB) - A23-5

Always

Below 1 Ω

O134-2 (SHRR) - A23-6

Always

Below 1 Ω

O134-1 (SHG) - A23-2

Always

Below 1 Ω

O134-3 (SHB) or A23-5 - Body ground

Always

10 kΩ or higher

O134-2 (SHRR) or A23-6 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

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.

Click here 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: DISASSEMBLY 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: DISASSEMBLY

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A23-5 - A-16 (SBR)

Always

Below 1 Ω

A23-6 - A-17 (SHRL)

Always

Below 1 Ω

A23-2 - A-15 (SGR)

Always

Below 1 Ω
OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

NG

REPLACE HEADLIGHT UNIT ASSEMBLY LH 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: DISASSEMBLY 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: DISASSEMBLY