| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001GXJR |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: LIGHTING (INT): LIGHTING SYSTEM (for HV Model): IG Signal Circuit; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022] | ||
|
IG Signal Circuit |
DESCRIPTION
This circuit detects the power 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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![2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV 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 power 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 |
Power switch on (IG) signal |
OFF or ON |
OFF: Power switch off ON: Power switch on (IG) |
"OFF" is also displayed for this item when the power 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 |
Power switch off |
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. |
CHECK HARNESS AND CONNECTOR (IG1-NO. 1 RELAY POWER SOURCE) |
|
*a |
Component with harness connected (Instrument Panel Junction Block Assembly) |
- |
- |
(a) Connect the 4D and 4F instrument panel junction block assembly connectors.
(b) Connect the I86 main body ECU (multiplex network body ECU) connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4E-17 - Body ground |
Power switch on (IG) |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
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) |
Auxiliary battery not connected to 4E-17 and 4F-3 |
10 kΩ or higher |
|
4D-1 - MB-32 (IG) |
Auxiliary battery positive (+) → 4E-17 Auxiliary battery negative (-) → 4F-3 |
Below 1 Ω |
| OK |
|
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| NG |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
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