| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM1000000028DBB |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [11/2022 - ] |
| Title: LIGHTING (INT): LIGHTING SYSTEM: IG Signal Circuit; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 - ] | ||
|
IG Signal Circuit |
DESCRIPTION
This circuit detects the ignition switch ON or off condition, and sends it to the main body ECU (multiplex network body ECU).
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.*
for Gasoline Model: Click here
![2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [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 |
|---|---|---|---|---|
|
IGR Power |
Ignition switch ON signal |
OFF or ON |
OFF: Ignition switch off ON: Ignition switch ON |
- |
Body Electrical > Main Body > Data List
|
Tester Display |
|---|
|
IGR Power |
OK:
Normal conditions listed above are displayed.
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - POWER SOURCE AND BODY GROUND) |
(a) Disconnect the 8A, 8D and 8K power distribution box assembly connectors.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
*1: for Gasoline Model
*2: for HV Model |
||
|
8K-1 - Body ground |
Always*1 Ignition switch off*2 |
11 to 14 V |
|
8D-17 - Body ground |
Ignition switch off |
Below 1 V |
|
8D-17 - Body ground |
Ignition switch ON |
11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
8A-8 - Body ground |
Always |
Below 1 Ω |
|
8D-8 - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
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 |
|---|---|---|
|
8K-1 - MB-27 (IGR) |
Auxiliary battery not connected to 8D-17 - 8A-8 or 8D-8 |
10 kΩ or higher |
|
8K-1 - MB-27 (IGR) |
Auxiliary battery positive (+) → 8D-17 Auxiliary battery negative (-) → 8A-8 or 8D-8 |
Below 1 Ω |
| OK |
|
| NG |
|
|
|