Description:

The error code ETC 522343.12 is triggered when the power module (HF) PC6 measures in excess of 1 amp at the output of resistor (R17; for heated rear window) (lead 2031) while the rear window heater is switched off. This indicates a short in the circuit or an internal fault in the power module.

Reaction:

When this fault is detected, the power module may disable the rear window heater to prevent damage due to excessive current when it should be off. This can lead to the rear window heater not functioning properly.

Recommendations:

Inspect Electrical Circuits:

• Check for Shorts to Ground: Inspect the wiring and connectors for the rear window heater resistor (R17) for signs of short circuits. Look for damaged insulation, exposed wires, or pinched cables.
• Measure Current Flow: Use a multimeter to measure the current flow in lead 2031 to ensure no current is present when the heater is off.

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 drawing current when it should be off.
• 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 Damaged Wiring: Repair or replace any damaged or shorted wiring in the rear window heater circuit. Ensure all connections are secure and properly insulated.

Note:

Regular maintenance and inspection of the electrical components associated with the heated rear window can help prevent issues related to current draw when the system is off. Ensuring proper routing and securing of wires can reduce the risk of shorts and enhance system reliability.