| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001GXJW |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: LIGHTING (INT): LIGHTING SYSTEM (for HV Model): Interior Light Circuit; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022] | ||
|
Interior Light Circuit |
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the operation of the following lights:
- Map Light Assembly
- Rear Room Light (No. 1 Room Light Assembly)
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)
HINT:
The DOME CUT relay supplies power to the interior lights. If all the lights that use power from the DOME CUT relay do not turn on, check the interior light auto cut circuit first.
Click here
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 |
|---|---|---|---|
|
Illuminated Entry System |
Turns on the lights that are controlled by the illuminated entry system* |
OFF or ON |
Perform the Active Test with the door linked switch of the map light assembly on and switch of the rear room light (No. 1 room light assembly) in the DOOR position. |
-
*: Refer to System Description for the lights that are controlled by the illuminated entry system.
Click here
Body Electrical > Main Body > Active Test
|
Tester Display |
|---|
|
Illuminated Entry System |
OK:
All lights that are controlled by the illuminated entry system come on.
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Map light does not come on) |
B |
|
NG (Rear room light does not come on) |
C |
|
NG (Map light and rear room light does not come on) |
D |
| A |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
|
| C |
|
| D |
|
|
|
2. |
INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light assembly.
Click here
(b) Inspect the map light assembly.
Click here
| NG |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - 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 |
|---|---|---|
|
T6-10 (+B1) - 4F-10 |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAP LIGHT ASSEMBLY) |
(a) Disconnect the T6 map light assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
T6-10 (+B1) -T6-2 (RLMP) |
Rear room light (No. 1 room light assembly) switch set to DOOR |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (INCLUDING BULB HOLDER OF THE NO. 1 ROOM LIGHT ASSEMBLY THAT ARE PART OF THE WIRE HARNESS) |
|
5. |
INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light assembly.
Click here
(b) Inspect the map light assembly.
Click here
| NG |
|
|
|
6. |
CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - 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 |
|---|---|---|
|
T6-10 (+B1) - 4F-10 |
Always |
Below 1 Ω |
|
T6-1 (DOOR) - 4F-29 |
Always |
Below 1 Ω |
|
T6-10 (+B1) or 4F-10 - Body ground |
Always |
10 kΩ or higher |
|
T6-1 (DOOR) or 4F-29 - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
7. |
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 |
|---|---|---|
|
4F-29 - MB-1 (ILE) |
Always |
Below 1 Ω |
| OK |
|
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| NG |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
|
|