# Service bulletin LI83.70\-P\-078292

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: 11012788
- Published by NHTSA: 2025\-01\-10
- Manufacturer's number: LI83.70\-P\-078292
- Manufacturer's date: 2025\-01\-09
- NHTSA component: ELECTRICAL SYSTEM; VISIBILITY/WIPER

## NHTSA's summary

Complaint Red warning message in instrument cluster: "Towing not allowed, see Operator's Manual, consult workshop without starting the engine again". Cause Missing diaphragm on high voltage PTC \(interior heating\) N33/14 component part results in moisture buildup in the installation space for the heater and causes an insulation fault. The entry of moisture into the high voltage PTC \(interior heating\) N33/14 in the high voltage wiring harness to the DC/DC converter N83/1 causes a slow\-acting insulation fault. This may occur sporadically only to start with before actively developing over time. Remedy Exchange high voltage PTC \(interior heating\) N33/14 with new part with diaphragm \(production date as from 22T231, see component part label\). If necessary, and after further testing/measurement, replace wiring harness for DC/DC converter N83/1 to high voltage PTC \(interior heating\) N33/14. Note: According to the Replacement Parts Department only high voltage PTCs \(interior heating\) with a diaphragm and with production date as from 22T231 are available\!

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11012788-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11012788-9999.pdf)

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

## Components

Electrical system, Glass, wipers and mirrors, Wipers and washers

## Vehicles listed

- 2023 to 2024 MERCEDES\-BENZ AMG EQE
- 2024 MERCEDES\-BENZ EQE 350 4MATIC
- 2023 to 2024 MERCEDES\-BENZ EQE 350\+
- 2023 to 2024 MERCEDES\-BENZ EQE 500
- 2022 to 2024 MERCEDES\-BENZ EQS 450\+
- 2023 MERCEDES\-BENZ EQS 580
- 2023 to 2024 MERCEDES\-BENZ EQS SUV 450 4MATIC
- 2023 to 2024 MERCEDES\-BENZ EQS SUV 450\+
- 2023 to 2024 MERCEDES\-BENZ EQS SUV 580 4MATIC
- 2024 MERCEDES\-BENZ redundant EQE 350
- 2023 MERCEDES\-BENZ redundant EQE 350 4MATIC
- 2023 to 2024 MERCEDES\-BENZ redundant EQS 450
- 2024 MERCEDES\-MAYBACH EQS SUV 680 4MATIC

JSON: [/v1/bulletins/11012788](/v1/bulletins/11012788)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20LI83.70-P-078292&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11012788&vehicle=Service%20bulletin%20LI83.70-P-078292)