| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001AW96 |
| Model Year Start: 2019 | Model: Avalon | Prod Date Range: [04/2018 - ] |
| Title: LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): IG Signal Circuit; 2019 - 2022 MY Avalon [04/2018 - ] | ||
|
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 - 2022 MY Avalon [04/2018 - ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
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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 (POWER SOURCE CIRCUIT) |
(a) Disconnect the 4K and 4D instrument panel junction block assembly connectors.
(b) Disconnect the G32 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 |
|---|---|---|
|
4K-1 - Body ground |
Always |
11 to 14 V |
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4D-3 - Body ground |
Always |
Below 1 Ω |
|
G32-19 (GND2) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
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 |
|---|---|---|
|
4K-1 - MB-32 (IG) |
Battery not connected to 4A-17 and 4D-3 |
10 kΩ or higher |
|
4K-1 - MB-32 (IG) |
Battery positive (+) → 4A-17 Battery negative (-) → 4D-3 |
Below 1 Ω |
| OK |
|
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| NG |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
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