18049

Service Update
18049 Intermittent Loss of Tail Lamps
Reference Number:
Attention:
Release Date:
Revision:
N172131740
February 2018
00
This service update includes vehicles in dealer inventory and customer vehicles that return to the
dealership for any reason. This bulletin will expire at the end of the involved vehicle’s New Vehicle Limited
Warranty period.
Make
Cadillac
Model
XTS
Model Year
From
To
2018
2018
RPO
Description
Involved vehicles are marked “open” on the Investigate Vehicle History screen in GM Global Warranty Management
system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections
and/or repairs.
Condition
Correction
Certain 2018 model year Cadillac XTS vehicles may have a multi-use relay assembly that is not fully
seated in the underhood buss electrical center. This can cause an intermittent loss of tail lamps.
Dealers are to remove, inspect, and if necessary, replace the multi-use relay assembly (tail lamp/park
lamp).
Parts
Quantity
1 (As
Req.)
Part Name
Multi-Use Relay Assembly (Tail Lamp/Park Lamp)
Part No.
19116962
Reminder: Parts may be removed from Retail Inventory Management (RIM). Dealers should review the affected parts
to confirm RIM managed status. Parts may have quantity limiters in effect.
Warranty Information
Labor
Operation
9103658
Description
Remove and Inspect Micro Relay 11 (Tail Lamp/Park Lamp)
(Includes Replacement)
Labor
Time
0.2
Trans.
Type
ZFAT
Net
Item
N/A
Service Procedure
1.
Open the hood.
4975772
2.
Locate the front compartment fuse block.
3.
Remove the fuse block cover.
Copyright 2018 General Motors. All Rights Reserved.
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Service Update
18049 Intermittent Loss of Tail Lamps
4975773
4.
Remove and inspect Micro Relay 11 for signs of arcing or damage (Tail Lamp/Park Lamp).
5.
Reinstall (or replace if necessary) Micro Relay 11.
6.
Perform a visual inspection of the fuse block to ensure all other relays are completely seated.
7.
Reinstall the fuse block cover and close the hood.
Dealer Responsibility
Whenever a vehicle subject to this service update enters your vehicle inventory, or is in your facility for service in the
future, and the vehicle is still covered under the New Vehicle Limited Warranty, you must take the steps necessary to be
sure the service update correction has been made before selling or releasing the vehicle.
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers' possession
and subject to this bulletin must be held and inspected/repaired per the service procedure of this bulletin before customers
take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealer-traded,
released to auction, used for demonstration, or any other purpose.
All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System
(CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting
an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified
for sale within the CPOIS system, or once again be used in the CTP program.
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 tools, equipment, 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 dealer for information on whether your
vehicle may benefit from the information.
We Support
Voluntary Technician
Certification
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GLOBAL SAFETY FIELD INVESTIGATIONS
DCS4678
URGENT - DISTRIBUTE IMMEDIATELY
Date:
February 26, 2018
Subject: 18049 - Service Update
Intermittent Loss of Tail Lamps
Models: 2018 Cadillac XTS
To:
All General Motors Dealers
General Motors is releasing Service Update 18049 today. The total number of
U.S. vehicles involved is approximately 3,976. Please see the attached
bulletin for details.
Global Warranty Management (GWM)
The Investigate Vehicle History (IVH) screen in the GWM system will be updated
February 27, 2018. A list of involved vehicles in dealer new inventory is attached to this
message. Please hold all warranty transactions until IVH has been updated.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS