NHTSA ID Number: 10205573
Manufacturer Communication Number: 21NA251
Summary
This service bulletin provides information for dealers/technicians on an appearance concern with driver outside rearview mirror dimming.
3 Affected Products
Vehicle
| MAKE | MODEL | YEAR |
CHEVROLET | CORVETTE | 2020-2022 |
Condition
Some customers may comment that their driver outside rearview mirror has numerous lines in it and it looks dim all the time. The electrical device may cause higher voltage to the mirror.
Cause
This condition may be caused by the installation of an aftermarket radar detector jumper harness that powers a radar detector.
Correction
Note: If this Condition if found, it may be a customer pay repair and NOT a Warrantable repair.
The technician should inspect for a jumper harness added to the mirror’s X1 connector. The connector located behind the front cover of the inside rearview mirror.
Authorization for disconnecting the jumper harness, and/or replacement of a damaged outside rearview mirror, must be obtained from the customer.
SEOCONTENT-START
Copyright 2021 General Motors LLC. All Rights Reserved.
Service Bulletin Bulletin No.: 21-NA-251
Date: November, 2021
INFORMATION
Subject: Information on Appearance Concern with Driver Outside Rearview Mirror Dimming
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Chevrolet Corvette 2020 2022 — — All All
Involved Region or Country North America, Europe, Middle East, Japan, Australia/New Zealand
Condition
5918432
Some customers may comment that their driver outside rearview mirror has numerous
lines in it and it looks dim all the time. The electrical device may cause higher voltage to
the mirror.
Cause This condition may be caused by the installation of an aftermarket radar detector jumper
harness that powers a radar detector.
Correction
Note: If this Condition if found, it may be a customer pay repair and NOTa Warrantable
repair.
The technician should inspect for a jumper harness added to the mirror’s X1 connector.
The connector located behind the front cover of the inside rearview mirror.
Authorization for disconnecting the jumper harness, and/or replacement of a damaged
outside rearview mirror, must be obtained from the customer.
Version 1
Modified Released November 05, 2021
GM bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: 21-NA-251
Date: November, 2021
MC-10205573-9999.pdf 970.459KB
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