Fendt A.1.5B – A057 - ECU, steering controller (Auto-Guide): Invalid EEPROM parameters for the steering control regulator

The steering controller has detected an invalid data set within its EEPROM, preventing the Auto-Guide automated steering system from functioning correctly.

• 411 Vario COM III
• 412 Vario COM III
• 413 Vario COM III
• 414 Vario COM III
• 415 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 718 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• Fendt 200 Vario (including V / F / P variants)
• Fendt 300 Vario COM III
• Fendt 400 Vario COM III
• Fendt 700 Vario COM III
• Fendt 800 Vario COM III
• Fendt 900 Vario COM III

1. 1

   Check system voltage to verify the power supply to the A057 ECU, as drops below 10.1 VDC can cause EEPROM reading/writing errors

2. 2

   Check for accompanying EEPROM codes (such as A.1.55, A.1.56, or A.1.57) which usually point to a hard internal failure of the module

3. 3

   Inspect the wiring harness and connections to the A057 steering controller for corrosion or damage that could cause data corruption or voltage drops

1. 1

   Connect diagnostic tool

   Connect the FENDIAS diagnostic laptop to the tractor.

2. 2

   Perform EOL programming

   Perform EOL (End of Line) programming on the A057 steering controller to re-flash the module and overwrite the corrupted EEPROM parameters with a valid data set.

3. 3

   Replace module

   If the FENDIAS tool cannot successfully write to the EEPROM, the A057 ECU has suffered a hardware failure and must be replaced.

4. 4

   Recalibrate system

   Perform a steering valve and steering angle sensor calibration (Calibration code 2401 / 2403) before the Auto-Guide system will engage.