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

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

Ohmmeter display °° 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.

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