Code No.B2544 Flash ROM fault
TROUBLE JUDGEMENT
The camera-ECU detects the internal error (Flash ROM), the camera-ECU sets diagnosis code No.B2544.
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When diagnosis code No.B2544 is set, the entire monitor screen is displayed in black. Alternatively, "x" mark is displayed on the vehicle icon.
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PROBABLE CAUSES
- Malfunction of camera-ECU
DIAGNOSIS PROCEDURE
Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the camera-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the camera-ECU (Refer to 
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).