| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001GXK2 |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: LIGHTING (INT): LIGHTING SYSTEM (for HV Model): Ambient Illumination Light Circuit; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022] | ||
|
Ambient Illumination Light Circuit |
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the operation of the following lights:
- Center Tray Illumination Light (Instrument Panel Light Assembly)
- Cup Holder Light (Console Box Pocket Garnish)
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.
Click here
![2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION](/t3Portal/stylegraphics/info.gif)
PROCEDURE
|
1. |
PERFORM ACTIVE TEST 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 / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Main Body > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Fr Foot Light |
|
OFF or ON |
Preconditions for using the Active Test to check dimmer controlled illumination:
|
Body Electrical > Main Body > Active Test
|
Tester Display |
|---|
|
Fr Foot Light |
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Center tray illumination light does not come on) |
B |
|
NG (Cup holder light does not come on) |
C |
|
NG (Center tray illumination light and cup holder light does not come on) |
D |
| A |
|
| C |
|
| D |
|
|
|
2. |
INSPECT CENTER TRAY ILLUMINATION LIGHT (INSTRUMENT PANEL LIGHT ASSEMBLY) |
(a) Remove the center tray illumination light (instrument panel light assembly).
Click here
(b) Inspect the center tray illumination light (instrument panel light assembly).
Click here
| NG |
|
REPLACE CENTER TRAY ILLUMINATION LIGHT (INSTRUMENT PANEL LIGHT ASSEMBLY) |
|
|
3. |
CHECK HARNESS AND CONNECTOR (CENTER TRAY ILLUMINATION LIGHT (INSTRUMENT PANEL LIGHT ASSEMBLY) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the 4E and 4F instrument panel junction block assembly connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I29-2 (B) - 4F-25 |
Always |
Below 1 Ω |
|
I29-1 (E) - 4E-37 |
Always |
Below 1 Ω |
|
I29-2 (B) or 4F-25 - Body ground |
Always |
10 kΩ or higher |
|
I29-1 (E) or 4E-37 - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
|
*a |
Component without harness connected (Instrument Panel Junction Block Assembly) |
- |
- |
(a) Disconnect the 4D instrument panel junction block assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4D-1 - 4F-25 |
Always |
Below 1 Ω |
| NG |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
|
|
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.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4E-37 -MB-26 (FSPT) |
Always |
Below 1 Ω |
| OK |
|
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| NG |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
|
6. |
INSPECT CUP HOLDER LIGHT (CONSOLE BOX POCKET GARNISH) |
(a) Remove the cup holder light (console box pocket garnish).
Click here
(b) Inspect the cup holder light (console box pocket garnish).
Click here
| NG |
|
|
|
7. |
CHECK HARNESS AND CONNECTOR (CUP HOLDER LIGHT (CONSOLE BOX POCKET GARNISH) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the 4E and 4F instrument panel junction block assembly connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I30-2 (B) - 4F-26 |
Always |
Below 1 Ω |
|
I30-1 (E) - 4E-36 |
Always |
Below 1 Ω |
|
I30-2 (B) or 4F-26 - Body ground |
Always |
10 kΩ or higher |
|
I30-1 (E) or 4E-36 - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
|
*a |
Component without harness connected (Instrument Panel Junction Block Assembly) |
- |
- |
(a) Disconnect the 4D instrument panel junction block assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4D-1 - 4F-26 |
Always |
Below 1 Ω |
| NG |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
|
|
9. |
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.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4E-36 -MB-26 (FSPT) |
Always |
Below 1 Ω |
| OK |
|
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| NG |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
|
10. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the 4D instrument panel junction block assembly connector.
(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 |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
11. |
CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
|
*a |
Component without harness connected (Instrument Panel Junction Block Assembly) |
- |
- |
(a) Disconnect the 4F instrument panel junction block assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4D-1 - 4F-25 |
Always |
Below 1 Ω |
|
4D-1 - 4F-26 |
Always |
Below 1 Ω |
| NG |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
|
|
12. |
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.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4E-36 -MB-26 (FSPT) |
Always |
Below 1 Ω |
|
4E-37 -MB-26 (FSPT) |
Always |
Below 1 Ω |
| OK |
|
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| NG |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
|
|