Toyota Corolla Cross: Headlight LH Circuit (B243900,B243A00)
DESCRIPTION
The light control LED ECU supplies internally boosted voltage to the light control LED ECU 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 | Detection condition:
- Ignition switch is to ON, low beam headlights illuminated
Malfunction status:
- Headlight unit LH malfunction
- Headlight unit LH power source and signal malfunction
Malfunction duration:
|
- Headlight unit assembly LH
- H-LP LH relay
- Power distribution box assembly
- Main body ECU (multiplex network body ECU)
- Harness or connector
|
B243A00 |
Headlight RH Circuit | Detection condition:
- Ignition switch is to ON, low beam headlights illuminated
Malfunction status:
- Headlight unit RH malfunction
- Headlight unit RH power source and signal malfunction
Malfunction duration:
|
- Headlight unit assembly RH
- H-LP RH relay
- Power distribution box assembly
- Main body ECU (multiplex network body ECU)
- Harness or connector
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
Body Electrical > Main Body > Clear DTCs
NEXT |
| |
(a) Check for DTCs.
Body Electrical > Main Body > Trouble Codes
OK:
DTC B243900 and B243A00 are not output.
Result | Proceed to |
DTCs are not output | A |
B243900 is output | B |
B243A00 is output | C |
A |
| USE SIMULATION METHOD TO CHECK |
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PROCEDURE
1.
READ VALUE USING GTS (a) Read the Data List a
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DTC No. Detection Item
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(a) Vehicle behavior categorized by DTC If a DTC is output, the vehicle behaves as follows.
DTC No. Detection Item
Vehicle Behavior when DTC is Output
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AWD stopped
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