Fault code 1: Elimination:

• Switch off ignition
• Pull plug off the control module 
• Pull plug off the servomotor for HBA 
• Check for open circuit in the supply leads to the servomotor for HBA,  terminals 1, 2, 3, 4

  Ohmmeter display < 5 Ohm

• Check for short to B+ in the supply leads to the servomotor for HBA 

  Ohmmeter connected to terminals 1, 2, 3, and 4; measure resistance to ground

  Ohmmeter display "INFINITY" Ohm

• Check for short circuits between the supply leads.

If no fault is detected in the wires, replace the servomotor for HBA.  Also check the plug on the wiring harness side and replace if necessary.