Diagnosis code No.B1722 is stored when the ETACS-ECU cannot communicate with the electric motor
key because of defective key ring antenna (antenna wire).
COMMENT ON TROUBLE SYMPTOM
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.
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 ETACS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check the key reminder switch (key ring antenna)
(1)Disconnect the key reminder switch (key ring antenna) connector B-203.
(2)Take the measurements below at component-side connector. There should be continuity between terminals 8, 10 and body earth. OK: Continuity exists (2 Ω or less)
Q.
Is the check result satisfactory?
Go to Step 2
Replace the key reminder switch (key ring antenna), and then go to Step 5 .
STEP 2. Connector check: ETACS-ECU connector B-317 and key reminder
switch (key ring antenna) connector B-203.
Q.
Is the check result satisfactory?
Go to Step 3
Repair the connector, and then go to Step 4.
STEP 3. Check the wiring harness between ETACS-ECU connector B-317
(terminal 57 and 58) and key reminder switch (key ring antenna) connector B-203 (terminal 8
and 10).
Q.
Is the check result normal?
Go to Step 4
Repair the wiring harness, and then go to Step 4.
STEP 4. Check whether the diagnosis code is reset.
(1)Turn the electric motor switch to the "LOCK" (OFF) position once, and then turn
it to the ON position again.
(2)Check if diagnosis code No.B1722 is set as a current trouble.
Q.
Is diagnosis code No.B1722 set as a current trouble?
Replace the key reminder switch (key ring antenna), and then go to Step 5.
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.
STEP 5. Check whether the diagnosis code is reset.
(1)Turn the electric motor switch to the "LOCK" (OFF) position once, and then turn
it to the ON position again.
(2)Check if diagnosis code No.B1722 is set as a current trouble.
Q.
Is diagnosis code No.B1722 set as a current trouble?
Replace the ETACS-ECU and register the ID codes (Refer to ).
After registering the ID codes, return to Step 1.
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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Go to Step 2
Replace the key reminder switch (key ring antenna), and then go to Step 5 .
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After registering the ID codes, return to Step 1.