# Service bulletin LI77.21\-P\-080504

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: 11032874
- Published by NHTSA: 2026\-05\-20
- Manufacturer's number: LI77.21\-P\-080504
- Manufacturer's date: 2026\-05\-18
- NHTSA component: VISIBILITY/WIPER

## NHTSA's summary

Complaint The panoramic sliding sunroof operates in a stepped movement. The panoramic roof becomes denormalized without an apparent reason \(not directly after control unit replacement\). Automatic operation of the glass panel and roller sunblind is not possible; only tip‑mode operation is available. In combination with one, serval, or all of the following Fault Codes stored in the panoramic roof control unit \(PSD, A98, N70/1, TSSR223\): • B1E9157 • B1E9151 • B1E9146 • B1E7551 • B184951 • B184946 Note: For 206, please see LI77.21\-P\-074971 for complaints of the sliding sunroof panel of panoramic sliding sunroof reverses \(temporarily, once, multiple times\) during closing process without an entrapment event Cause Resetting the panoramic roof control unit \(PSD, A98, N70/1, TSSR223\) can lead to loss of normalization. The root cause for the control unit reset is currently under investigation. Remedy Contribution to cause analysis: • CPrint the attached document “Panoramic Roof Customer Questionnaire.” • Complete the questionnaire together with the customer. • Open a TIPS case and attach the completed questionnaire. • Submit the TIPS case to the Body / Chassis / Entertainment inbox. Remedy: Perform Initial Start‑Up of the panoramic roof control unit \(PSD, A98, N70/1, TSSR223\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11032874-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11032874-9999.pdf)

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

## Components

Glass, wipers and mirrors, Wipers and washers

## Trouble codes named

B1849, B1E75, B1E91

## Vehicles listed

- 2024 MERCEDES\-BENZ E 450
- 2026 MERCEDES\-BENZ E 450 4MATIC
- 2024 to 2026 MERCEDES\-BENZ E 450 4MATIC ALL\-TERRAIN
- 2026 MERCEDES\-BENZ E53 E 4MATIC\+ ALL\-TERRAIN

JSON: [/v1/bulletins/11032874](/v1/bulletins/11032874)

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