Code No. C2221 SONAR ECU internal buzzer
OPERATION
When the system detects that the buzzer integrated in the clearance warning control unit fails, diagnosis code No. C2221 will beset.
TROUBLE JUDGEMENT
The condition below is satisfied:
- The built-in buzzer circuit fails for at least three seconds.
PROBABLE CAUSES
- Malfunction of clearance warning control unit
DIAGNOSIS PROCEDURE
Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the clearance warning control unit.
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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 clearance warning control unit (Refer to 
).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).