| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001GL91 |
| Model Year Start: 2020 | Model: GR Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model without AFS): Daytime Running Light Circuit; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022] | ||
|
Daytime Running Light Circuit |
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the daytime running lights.
WIRING DIAGRAM
for LED Type Turn Signal Light
for Bulb Type Turn Signal Light
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*
Click here
![2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION](/t3Portal/stylegraphics/info.gif)
- *: w/ Smart Key System
PROCEDURE
|
1. |
CHECK OPERATION (LOW BEAM HEADLIGHTS) |
(a) Check the operation of the low beam headlights.
OK:
The low beam headlights operate normally.
| NG |
|
GO TO PROBLEM SYMPTOMS TABLE
|
|
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Main Body > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Daytime Running Light |
Daytime running lights |
OFF or ON |
- |
Body Electrical > Main Body > Active Test
|
Tester Display |
|---|
|
Daytime Running Light |
OK:
Daytime running lights illuminate.
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - HEADLIGHT ASSEMBLY) |
(a) Disconnect the 4B instrument panel junction block assembly connector.
(b) for LED Type Turn Signal Light
(1) Disconnect the A81 headlight assembly LH connector.
(2) Disconnect the A80 headlight assembly RH connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4B-28 - A81-1 (B) |
Always |
Below 1 Ω |
|
4B-28 - A80-1 (B) |
Always |
Below 1 Ω |
|
4B-28 or A81-1 (B) - Body ground |
Always |
10 kΩ or higher |
|
4B-28 or A80-1 (B) - Body ground |
Always |
10 kΩ or higher |
(c) for Bulb Type Turn Signal Light
(1) Disconnect the A29 headlight assembly LH connector.
(2) Disconnect the A27 headlight assembly RH connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A29-1 (B) - 4B-28 |
Always |
Below 1 Ω |
|
A27-1 (B) - 4B-28 |
Always |
Below 1 Ω |
|
A29-1 (B) or 4B-28 - Body ground |
Always |
10 kΩ or higher |
|
A27-1 (B) or 4B-28 - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
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.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4B-28 - MB-25 (DRL) |
Always |
Below 1 Ω |
| OK |
|
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| NG |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
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