Toyota Yaris: Lighting System / Headlight LH Circuit (B243900,B243A00)
DESCRIPTION
The light control LED ECU supplies internally boosted voltage to the light control LED ECU LH so that the current supplied to the LED is always maintained at a constant value.
These DTCs are also output when the main body ECU (multiplex network body ECU) detects malfunctions while monitoring the applied voltage.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B243900 | Headlight LH Circuit |
Malfunction status:
|
|
| B243A00 | Headlight RH Circuit |
Malfunction status:
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.
Click here
.gif)
-
First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CXPI communication malfunctions before troubleshooting this symptom.
Click here
PROCEDURE
| 1. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Main Body > Clear DTCs
|
.gif)
| 2. | CHECK FOR DTC |
(a) Turn the ignition switch to ON.
(b) Wait 10 seconds or more.
(c) Turn the GTS on.
(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.
(e) Check for DTCs.
Body Electrical > Main Body > Trouble Codes| Result | Proceed to |
|---|---|
| B243900 and B243A00 are not output | A |
| B243900 is output | B |
| B243A00 is output | C |
| A |
.gif) | USE SIMULATION METHOD TO CHECK |
| C |
| GO TO STEP 6 |
|
| 3. | CHECK HEADLIGHT UNIT ASSEMBLY LH |
(a) Interchange the headlight unit assembly LH with RH and connect the connectors to them.
Click here
(b) Clear the DTCs.
Body Electrical > Main Body > Clear DTCs
|
| 4. | CHECK FOR DTC |
(a) Turn the ignition switch to ON.
(b) Wait 10 seconds or more.
(c) Turn the GTS on.
(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.
(e) Check for DTCs.
Body Electrical > Main Body > Trouble Codes| Result | Proceed to |
|---|---|
| DTC B243900 is output | A |
| DTC B243A00 is output | B |
| B |
| REPLACE HEADLIGHT UNIT ASSEMBLY LH |
|
| 5. | CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY LH - LIGHT CONTROL LED ECU LH) |
| (a) Remove the headlight unit assembly LH. Click here
|
|
(b) Remove the wire harness.
Click here
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A - [1] - B - [16] | Always | Below 1 Ω |
| A - [3] - B - [5] | Always | Below 1 Ω |
| OK |
| REPLACE LIGHT CONTROL LED ECU LH |
| NG |
| REPLACE HARNESS AND CONNECTOR |
| 6. | CHECK HEADLIGHT UNIT ASSEMBLY RH |
(a) Interchange the headlight unit assembly RH with LH and connect the connectors to them.
Click here
(b) Clear the DTCs.
Body Electrical > Main Body > Clear DTCs
|
| 7. | CHECK FOR DTC |
(a) Turn the ignition switch to ON.
(b) Wait 10 seconds or more.
(c) Turn the GTS on.
(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.
(e) Check for DTCs.
Body Electrical > Main Body > Trouble Codes| Result | Proceed to |
|---|---|
| DTC B243A00 is output | A |
| DTC B243900 is output | B |
| B |
| REPLACE HEADLIGHT UNIT ASSEMBLY RH |
|
| 8. | CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY RH - LIGHT CONTROL LED ECU RH) |
| (a) Remove the headlight unit assembly RH. Click here
|
|
(b) Remove the wire harness.
Click here
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A - [1] - B - [16] | Always | Below 1 Ω |
| A - [3] - B - [5] | Always | Below 1 Ω |
| OK |
| REPLACE LIGHT CONTROL LED ECU RH |
| NG |
| REPLACE HARNESS AND CONNECTOR |
Light Sensor Circuit Malfunction (B124400)
DESCRIPTION The automatic light control sensor detects ambient light. The sensor creates an electrical signal based on the amount of light detected, and sends the signal to the main body ECU (multiplex network body ECU)...
Low Beam LH Circuit Voltage Out of Range (B24441C,B24451C)
DESCRIPTION The BIN resistance is equipped for the purpose of correcting variances in brightness (luminous flux) when the light control LED ECU is energizing the LED with a constant current to illuminate it...
Other information:
Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Front Door Courtesy Switch
ComponentsCOMPONENTS ILLUSTRATION *1 FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY - - N*m (kgf*cm, ft.*lbf): Specified torque - - RemovalREMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH side and LH side...
Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Precaution
PRECAUTION PRECAUTIONS WHEN USING GTS (a) When using the GTS with the ignition switch off to troubleshoot: Connect the GTS to the vehicle, and turn a courtesy light switch on and off at 1.5 seconds intervals until communication between the GTS and vehicle begins...
Categories
- Manuals Home
- Toyota Yaris Owners Manual
- Toyota Yaris Service Manual
- Fuel Gauge
- Headlights
- Auto Lock/Unlock Function
- New on site
- Most important about car
Fuel-Filler Lid and Cap
WARNING
When removing the fuel-filler cap, loosen the cap slightly and wait for any hissing to stop, then remove it
Fuel spray is dangerous. Fuel can burn skin and eyes and cause illness if ingested. Fuel spray is released when there is pressure in the fuel tank and the fuel-filler cap is removed too quickly.
