High-frequency cheeping or ticking when heating is requested in the instrument panel area
Mercedes-Benz technical service bulletin LI83.20-P-079911 for 2026-2027 Mercedes-Benz Cla 250+ (EV) and 2026-2027 Mercedes-Benz Cla 350 4matic (EV).
- Bulletin number
- LI83.20-P-079911
- Component
- Visibility/wiper
- Summary
- Complaint High-frequency cheeping or ticking when heating is requested in the instrument panel area. Cause Variable switching frequencies in the high-voltage on-board electrical system can cause vibrations that lead to noise complaints on the HV-PTC N33/16 (air heater). Remedy Perform the following steps: 1. Compare the noise with the attached example. If the noise matches the example, proceed to step 2; otherwise, create a TIPS case. 2. Check whether SNR A1748354600 is installed. (Quick test → N33/16 → Hardware): If SNR A1748354600 is installed, proceed to step 3; otherwise, create a TIPS case. 3. Hardware replacement of the HV-PTC N33/16 air heater – install a new part with the current item number as per XPPI.
Vehicles covered
- Mercedes-Benz Cla 250+ (EV) 2026-2027 20262027
- Mercedes-Benz Cla 350 4matic (EV) 2026-2027 20262027
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