| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001H5W0 |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 06/2021] |
| Title: LIGHTING (EXT): LIGHTING SYSTEM (for HV Model): Headlight Dimmer Switch Circuit; 2020 - 2021 MY Corolla Corolla HV [01/2019 - 06/2021] | ||
|
Headlight Dimmer Switch Circuit |
DESCRIPTION
The steering sensor receives the following switch information:
- Light control switch in DRL OFF*1, off*2, tail, head, DRL*3 or AUTO*4 position
-
Dimmer switch in high, low or high flash (pass) position
- *1: w/ DRL OFF Switch
- *2: w/o DRL OFF Switch
- *3: w/o Automatic Light Control
- *4: w/ Automatic Light Control
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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. |
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: Chassis / Steering Angle Sensor / Data List.
(e) Read the Data List according to the display on the Techstream.
Chassis > Steering Angle Sensor > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Light OFF Switch |
Light control switch DRL OFF*1 or off*2 position signal |
OFF or ON |
OFF: Light control switch not in DRL OFF*1 or off*2 position ON: Light control switch in DRL OFF*1 or off*2 position |
- |
|
Auto Light Switch |
Light control switch AUTO*3 or DRL*4 position signal |
OFF or ON |
OFF: Light control switch not in AUTO*3 or DRL*4 position ON: Light control switch in AUTO*3 or DRL*4 position |
- |
|
Head Light Switch (Tail) |
Light control switch tail position signal |
OFF or ON |
OFF: Light control switch in neither tail nor head position ON: Light control switch in tail or head position |
- |
|
Head Light Switch (Head) |
Light control switch head position signal |
OFF or ON |
OFF: Light control switch not in head position ON: Light control switch in head position |
- |
|
High Beam Main Switch |
Dimmer switch high position signal |
OFF or ON |
OFF: Dimmer switch not in high position ON: Dimmer switch in high position |
- |
|
Passing Light Switch |
Dimmer switch high flash position (pass) signal |
OFF or ON |
OFF: Dimmer switch not in high flash position ON: Dimmer switch in high flash position |
- |
- *1: w/ DRL OFF Switch
- *2: w/o DRL OFF Switch
- *3: w/ Automatic Light Control
- *4: w/o Automatic Light Control
Chassis > Steering Angle Sensor > Data List
|
Tester Display |
|---|
|
Light OFF Switch |
|
Auto Light Switch |
|
Head Light Switch (Tail) |
|
Head Light Switch (Head) |
|
High Beam Main Switch |
|
Passing Light Switch |
OK:
Normal conditions listed above are displayed.
| NG |
|
|
|
2. |
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 |
|---|---|---|---|---|
|
Head Light SW (Head) |
Light control switch head position signal |
OFF or ON |
OFF: Light control switch not in head position ON: Light control switch in head position |
- |
Body Electrical > Main Body > Data List
|
Tester Display |
|---|
|
Head Light SW (Head) |
OK:
Normal conditions listed above are displayed.
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
|
3. |
INSPECT STEERING SENSOR |
|
*a |
Component without harness connected (Steering Sensor) |
- |
- |
(a) Remove the steering sensor.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I46-7 (HEAD) - z17-4 (H) |
Always |
Below 1 Ω |
| NG |
|
REPLACE STEERING SENSOR
|
|
|
4. |
CHECK HARNESS AND CONNECTOR (STEERING SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) |
(a) Disconnect the I85 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 |
|---|---|---|
|
I46-7 (HEAD) - I85-16 (HEAD) |
Always |
Below 1 Ω |
|
I46-7 (HEAD) or I85-16 (HEAD) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
INSPECT TURN SIGNAL SWITCH |
(a) Remove the turn signal switch.
Click here
(b) Inspect the turn signal switch.
Click here
| NG |
|
|
|
6. |
INSPECT STEERING WHEEL SWITCH HOUSING |
(a) Remove the steering wheel switch housing.
Click here
(b) Inspect the steering wheel switch housing.
Click here
| OK |
|
REPLACE STEERING SENSOR
|
| NG |
|
REPLACE STEERING WHEEL SWITCH HOUSING
|
|
|