Code No. C1900: Tyre ID code No. registration
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- If diagnosis code No. C1900 is set, diagnose the CAN bus lines.
- When replacing the ECU, always check that the communication circuit is normal.
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When the ID registration information of the TPMS transmitter is not stored in ETACS-ECU <Vehicles without KOS> or KOS-ECU, and/or when ETACS-ECU <Vehicles without KOS> or KOS-ECU is replaced with a new one, this code is set. If the ID registration mode is terminated forcibly or time-out after one or more TPMS transmitters are registered in the ID registration mode, the ID information in the ETACS-ECU <Vehicles without KOS> or KOS-ECU is erased, and this diagnosis code is set.
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- Malfunction of CAN bus line
- Damaged wiring harness and connector
- Malfunction of TPMS transmitter
- Malfunction of ETACS-ECU <Vehicles without KOS> or KOS-ECU
- ID code registration failed
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting). On completion, go to Step 2.
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STEP 2. Diagnosis code check
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(1)Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON" position.
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(2)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Register the ID codes (Refer to  ). Then go to Step 3.
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The procedure is complete.
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STEP 3. Check whether the diagnosis code is set again.
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(1)Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON" position.
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(2)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the KOS-ECU (Refer to GROUP 42B - KOS-ECU ) <Vehicles without KOS> or ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ) and register the ID codes. Then start over at Step 1.
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The procedure is complete.
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