| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001D07C |
| Model Year Start: 2019 | Model: GR Corolla | Prod Date Range: [06/2018 - 01/2019] |
| Title: LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): IG Signal Circuit; 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019] | ||
|
IG Signal Circuit |
DESCRIPTION
This circuit detects the engine switch on (IG) 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.
-
First, check for smart key system (for Start Function) DTCs, and after confirming that there is no malfunction, proceed with troubleshooting.
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![2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM |
(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 / Main Body / Data List.
(e) 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 |
|---|---|---|---|---|
|
IG SW |
Engine switch on (IG) signal |
OFF or ON |
OFF: Engine switch off ON: Engine switch on (IG) |
"OFF" is also displayed for this item when the engine switch is on (ACC). |
Body Electrical > Main Body > Data List
|
Tester Display |
|---|
|
IG SW |
OK:
Normal conditions listed above are displayed.
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
|
2. |
CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - POWER SOURCE AND BODY GROUND) |
(a) Disconnect the 4D and 4F instrument panel junction block assembly connectors.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4D-1 - Body ground |
Always |
11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4F-3 - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - BODY GROUND) |
(a) Disconnect the I86 main body ECU (multiplex network body ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I86-19 (GND2) - Body ground |
Always |
Below 1 Ω |
| 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.
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4F-3 - MB-11 (GND1) |
Always |
Below 1 Ω |
|
4D-1 - MB-32 (IG) |
Battery not connected to 4E-17 and 4F-3 |
10 kΩ or higher |
|
4D-1 - MB-32 (IG) |
Battery positive (+) → 4E-17 Battery negative (-) → 4F-3 |
Below 1 Ω |
| OK |
|
| NG |
|
|
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