Code No. B1722: Transponder Antenna Failure
TROUBLE JUDGMENT
Diagnosis code No.B1722 is stored when the
immobilizer-ECU cannot communicate with the ignition key because of defective
key ring antenna (antenna wire).
COMMENT ON TROUBLE SYMPTOM
Current trouble
- The wiring harness wire or connectors between the immobilizer-ECU and the
key ring antenna may have loose, corroded, or damage terminals, or terminals
pushed back in the connector, or the key ring antenna (antenna wire) may be
defective.
Past trouble
- If diagnosis code No.B1722 is stored as a past trouble, it is possible
that there were defective wiring harnesses, defective connectors or
defective antennas before.
PROBABLE CAUSES
- Damaged harness wires and connectors
- Malfunction of the key ring antenna (antenna wire)
- Malfunction of immobilizer-ECU
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STEP 1. Resistance measurement at key reminder switch connector D-310
[Check the key reminder switch (ignition key ring
antenna)].
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(1)Disconnect the key reminder switch (ignition key ring
antenna) connector D-310.
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(2)Take the measurements below at harness-side
connector.
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(3)There should be continuity between terminals 3, 7 and body
earth.
OK: Continuity exists (2 Ω
or less)
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Q.
Is the check result satisfactory?
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 Go to Step 2.
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 Replace the key reminder switch
(ignition key ring antenna), and then go to Step 5 .
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STEP 2. Connector check: Immobilizer-ECU connector D-126 and key
reminder switch (ignition key ring antenna) connector D-310.
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Q.
Is the check result satisfactory?
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Go to Step 3.
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Repair the connector, and then go
to Step 4.
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STEP 3. Check the wiring harness between D-126 immobilizer-ECU
connector terminal No.7, 8 and D-310 key reminder switch (ignition key
ring antenna) connector terminal No.3, 7.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the wiring harness, and
then go to Step 4.
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STEP 4. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to the "LOCK" (OFF) position
once, and then turn it to the "ON" position again.
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(3)Check if diagnosis code No.B1722 is set as a current
trouble.
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Q.
Is diagnosis code No.B1722 set as a current trouble?
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Replace the key reminder switch
(ignition key ring antenna), and then go to Step 5.
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If
diagnosis code No.B1722 is set as a past trouble, erase the diagnosis code
that is set as a past trouble, and the diagnosis is complete.
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STEP 5. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to the "LOCK" (OFF) position
once, and then turn it to the "ON" position again.
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(3)Check if diagnosis code No.B1722 is set as a current
trouble.
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Q.
Is diagnosis code No.B1722 set as a current trouble?
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Replace the immobilizer-ECU and
register the ID codes (Refer to  ). After registering the ID
codes, return to Step 1.
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If
diagnosis code No.B1722 is set as a past trouble, erase the diagnosis code
that is set as a past trouble, and the diagnosis is complete.
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