# Service bulletin LI83.20\-P\-079911

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11035228
- Published by NHTSA: 2026\-07\-27
- Manufacturer's number: LI83.20\-P\-079911
- Manufacturer's date: 2026\-07\-22
- NHTSA component: VISIBILITY/WIPER

## NHTSA's 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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11035228-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11035228-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Glass, wipers and mirrors, Wipers and washers

## Vehicles listed

- 2026 to 2027 MERCEDES\-BENZ CLA 250\+ \(EV\)
- 2026 to 2027 MERCEDES\-BENZ CLA 350 4MATIC \(EV\)

JSON: [/v1/bulletins/11035228](/v1/bulletins/11035228)

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