Code No.B1709: ETACS-ECU (EEPROM)
Code No.B1710: ETACS-ECU (ROM)
COMMENTS ON TROUBLE SYMPTOM
- If an error is detected more than once during the reading from/writing to the EEPROM of the ETACS-ECU, the ETACS-ECU stores the diagnosis code No. B1709.
- If a malfunction is found by the "ROM check" that is performed when the ETACS-ECU is reset or is resumed from the sleep mode, the ETACS-ECU stores the diagnosis code No. B1710.
PROBABLE CAUSES
- Malfunction of the ETACS-ECU
DIAGNOSIS PROCEDURE
Check whether the diagnosis code is reset.
Check if diagnosis code is set to the ETACS-ECU.
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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)On completion, check that the diagnosis code is reset.
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Q.
Is the diagnosis code set?
Replace the ETACS-ECU. Then perform the variant coding and write the VIN data (Refer to GROUP 00, Precautions Before Service - How to Perform Variant Coding 
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The procedure is complete.