| Last Modified: 06-05-2026 | 6.11:8.1.0 | Doc ID: RM1000000028DBC |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [11/2022 - ] |
| Title: LIGHTING (INT): LIGHTING SYSTEM: Front Door Courtesy Switch Circuit; 2023 - 2026 MY GR Corolla Corolla Corolla Hatchback Corolla HV [11/2022 - ] | ||
|
Front Door Courtesy Switch Circuit |
DESCRIPTION
The main body ECU (multiplex network body ECU) detects the condition of the front door courtesy light switch assembly.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*
for Gasoline Model: Click here
![2023 - 2026 MY GR Corolla Corolla Corolla Hatchback [11/2022 - ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION](/t3Portal/stylegraphics/info.gif)
for HV Model: Click here
- *: w/ Smart Key System
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM |
(a) Read the Data List according to the display on the Techstream.
Body Electrical > Main Body > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
FR Door Courtesy Switch Status |
Front door courtesy light switch assembly (for RH) signal |
Close or Open |
Close: Front door RH closed Open: Front door RH open |
- |
|
FL Door Courtesy Switch Status |
Front door courtesy light switch assembly (for LH) signal |
Close or Open |
Close: Front door LH closed Open: Front door LH open |
- |
Body Electrical > Main Body > Data List
OK:
Normal conditions listed above are displayed.
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG ("FL Door Courtesy Switch Status" is not normal) |
B |
|
NG ("FR Door Courtesy SW" is not normal) |
C |
| A |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
Click here
|
| C |
|
|
|
2. |
INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH |
(a) Inspect the front door courtesy light switch assembly LH.
Click here
| NG |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH - POWER DISTRIBUTION BOX ASSEMBLY) |
(a) Disconnect the 8H power distribution box assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O30-1 - 8H-23 |
Always |
Below 1 Ω |
|
O30-1 or 8H-23 - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
INSPECT POWER DISTRIBUTION BOX ASSEMBLY |
(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
8H-23 - MB-2 (FLCY) |
Always |
Below 1 Ω |
| OK |
|
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
Click here
|
| NG |
|
REPLACE POWER DISTRIBUTION BOX ASSEMBLY
Click here
|
|
5. |
INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH |
(a) Inspect the front door courtesy light switch assembly RH.
Click here
| NG |
|
|
|
6. |
CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH - POWER DISTRIBUTION BOX ASSEMBLY) |
(a) Disconnect the 8H power distribution box assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O32-1 - 8H-22 |
Always |
Below 1 Ω |
|
O32-1 or 8H-22 - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
7. |
INSPECT POWER DISTRIBUTION BOX ASSEMBLY |
(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
8H-22 - MB-4 (FRCY) |
Always |
Below 1 Ω |
|
|
|
|