Code No.B1722:
Antenna Failure
COMMENT ON TROUBLE SYMPTOM
This code will be set if the system cannot communicate with the transponder due to a defective key
ring antenna (broken antenna wire etc.).
PROBABLE CAUSES
Malfunction of the key ring antenna (antenna wire)
DIAGNOSIS PROCEDURE
STEP 1. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
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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 the diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the key ring antenna, and then go to Step 2.
It is determined that there is an intermittent malfunction such as poor engaged connector(s)
or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction 
).
STEP 2. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
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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 the diagnosis code is set.
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Q.
Is the diagnosis code set?
Return to Step 1.
The procedure is complete.