Code No. B1722: Immobilizer-antenna fail
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Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.
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Diagnosis code No.B1722 is stored when the ETACS-ECU cannot communicate with the ignition key because of defective key ring antenna (antenna wire).
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COMMENT ON TROUBLE SYMPTOM
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Current trouble
- The wiring harness wire or connectors between the ETACS-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.
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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.
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- Damaged harness wires and connectors
- Malfunction of the key ring antenna (antenna wire)
- Malfunction of ETACS-ECU
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STEP 1. Check the key reminder switch (ignition key ring antenna)
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(1)Disconnect the key reminder switch (ignition key ring antenna) connector.
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(2)Take the measurements below at component-side connector.
- There should be continuity between terminals 3 and 7.
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 4.
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STEP 2. Check of short to power supply, short to earth, and open circuit in ANT+, ANT- line between ETACS-ECU connector and key reminder switch connector
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Q.
Is the check result normal?
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Go to Step 3.
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Repair the connector(s) or wiring harness, and then go to Step 3.
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STEP 3. Check whether the diagnosis code is stored again.
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(1)Turn the ignition switch to the "LOCK" (OFF) position once, and then turn it to the ON position again.
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(2)Check if diagnosis code No.B1722 is stored as a current trouble.
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Q.
Is diagnosis code No.B1722 stored as a current trouble?
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Replace the key reminder switch (ignition key ring antenna), and then go to Step 4.
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If diagnosis code No.B1722 is stored as a past trouble, erase the diagnosis code that is stored as a past trouble, and the diagnosis is complete.
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STEP 4. Check whether the diagnosis code is stored again.
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(1)Turn the ignition switch to the "LOCK" (OFF) position once, and then turn it to the ON position again.
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(2)Check if diagnosis code No.B1722 is stored as a current trouble.
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Q.
Is diagnosis code No.B1722 stored as a current trouble?
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Replace the ETACS-ECU. After registering the ID codes, return to Step 1.
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If diagnosis code No.B1722 is stored as a past trouble, erase the diagnosis code that is stored as a past trouble, and the diagnosis is complete.
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