Description:

The error code ETC 522343.05 is triggered when the power module (HF) PC6 measures less than 350 mA at the output of resistor (R17; for heated rear window) (lead 2031) while the rear window heater is switched on. This indicates that the circuit is open.

Reaction:

When this fault is detected, the power module may deactivate the rear window heater to prevent malfunction due to lack of current. This will result in the rear window heater not functioning properly.

Recommendations:

Inspect Electrical Circuits:

• Check for Open Circuits: Inspect the wiring and connectors for the rear window heater resistor (R17) for signs of open circuits. Look for broken wires, loose connections, or corroded terminals.
• Measure Current Flow: Use a multimeter to measure the current flow in lead 2031 to ensure it is above 350 mA when the heater is activated.

Test and Replace Components:

• Test Rear Window Heater Resistor: Verify the operation of the R17 resistor. Replace the resistor if it is found to be defective or not drawing the expected current.
• Inspect Power Module: Ensure that the power module (HF) PC6 is functioning correctly. Replace the power module if it is found to be faulty.

Repair or Replace Wiring:

• Fix Open Circuits: Repair or replace any open or faulty wiring in the rear window heater circuit. Ensure all connections are secure and properly insulated.

Note:

Maintaining the integrity of the electrical connections is crucial for the reliable operation of the rear window heater. Regular inspection and timely repairs of the electrical system can help prevent issues related to open circuits and ensure proper system performance.