ACU 000158.04 (ACU 158.04)— ACU Switched Supply Voltage Low

ACU 000158.04 (ACU 158.04)

Code: 000158.04

Shortcode: 158.04


The error code ACU 000158.04 indicates that the switched supply voltage of the Armrest Control Unit (ACU) is below 9.0 volts. This condition may arise due to issues with the battery, alternator, or connections.


In response to this error, functions controlled by the ACU are disabled to prevent potential malfunction or damage to the system.


  • Check the battery and alternator for functionality and any faults.
  • Use a multimeter to verify the voltage at the ACU terminals.
  • Inspect all connections for signs of corrosion, looseness, or damage.
  • If the issue persists, it is recommended to contact a service center for further diagnostics and repair.


If the ACU’s supply voltage consistently falls below 9.0 volts, this may indicate a serious issue in the power system that requires immediate attention.