Description:

The error code ETC 523848.03 is triggered when the control unit measures a voltage in excess of 5 volts at the signal input of the potentiometer for the position of the air distribution flaps (adjusting motor B132 for air distribution, lead 2017). This indicates that the circuit is shorted to a supply lead or is open.

Reaction:

When this fault is detected, the control unit may disable or limit the operation of the air distribution adjusting motor to prevent damage due to overvoltage. This can result in incorrect positioning of the air distribution flaps, affecting the ventilation system’s performance.

Recommendations:

Inspect Electrical Circuits:

• Check for Shorts to Supply Lead or Open Circuits: Inspect the wiring and connectors for signs of short circuits to the supply lead or open circuits. Look for damaged insulation, exposed wires, or disconnected cables.
• Measure Voltage: Use a multimeter to measure the voltage at the signal input of the potentiometer (lead 2017) to ensure it is within the specified range.

Test and Replace Components:

• Test Adjusting Motor and Potentiometer: Verify the operation of the B132 adjusting motor and potentiometer. Replace if any components are found to be malfunctioning or drawing excessive voltage.
• Inspect Control Unit: Ensure that the control unit is functioning correctly. Replace the control unit if it is found to be faulty.

Repair or Replace Wiring:

• Fix Damaged Wiring: Repair or replace any damaged or shorted wiring in the air distribution adjusting motor circuit. Ensure all connections are secure and properly insulated.

Note:

Regular maintenance and inspection of the electrical system can help prevent issues related to overvoltage in the air distribution adjusting motor circuit. Ensuring proper routing and securing of wires can reduce the risk of shorts and enhance system reliability.