| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001AULL |
| Model Year Start: 2019 | Model: GR Corolla | Prod Date Range: [06/2018 - 09/2022] |
| Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): B242E; Open in IG Circuit; 2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022] | ||
|
DTC |
B242E |
Open in IG Circuit |
DESCRIPTION
The headlight ECU sub-assembly operates using the power source voltage input from the IG terminal and ECUB terminal.
The IG terminal power source voltage is supplied by turning the IG1-NO. 1 relay to ON.
The headlight ECU sub-assembly receives engine switch on (IG) signals from the main body ECU (multiplex network body ECU) via CAN communication, compares the engine switch on (IG) signal and the power source voltage supply condition of the IG terminal and monitors the result.
AFS
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
DTC Output from |
|---|---|---|---|---|
|
B242E |
Open in IG Circuit |
Detection condition:
Malfunction status:
Malfunction duration:
|
|
AFS |
AFS (Sub)
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
DTC Output from |
|---|---|---|---|---|
|
B242E |
Open in IG Circuit |
Detection condition:
Malfunction status:
Malfunction duration:
|
|
AFS (Sub) |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
-
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](/t3Portal/stylegraphics/info.gif)
- 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
|
|
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 B242E 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 |
|
| C |
|
|
|
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.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A23-3 - A-4 (IG) |
Always |
Below 1 Ω |
|
A23-4 - A-12 (GND) |
Always |
Below 1 Ω |
| NG |
|
REPLACE HEADLIGHT UNIT ASSEMBLY LH
|
|
|
4. |
INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH (IG 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-4 (IG) - Body ground |
Engine switch on (IG) |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
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 |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
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.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A22-3 - A-4 (IG) |
Always |
Below 1 Ω |
|
A22-4 - A-12 (GND) |
Always |
Below 1 Ω |
| NG |
|
REPLACE HEADLIGHT UNIT ASSEMBLY RH
|
|
|
7. |
INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH (IG 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-4 (IG) - Body ground |
Engine switch on (IG) |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
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 |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|