Before installing a variety of GM Accessories, such as keyless entry, upsize wheels and tires, lights/cargo lamps and others, on GM vehicles, it’s important to check for vehicle compatibility, if a calibration update from the Techline Customer Support Center (TCSC) is required and that an authorization code is available. (Fig. 14) Checking all of these items as well as several others before starting installation will help ensure that the installation of GM Accessories is successful.
For example, if programming is attempted before contacting TCSC when installing accessories that require an updated calibration, the Service Programming System (SPS) will not deliver the correct accessory calibration to the vehicle.
Fig. 14
Accessory/Reconfiguration Best Practices
Prior to beginning installation of an accessory, there are a number of guidelines that should be followed by dealerships. These guidelines can help prevent incompatible accessories from being installed on GM vehicles and assist in the installation process so that the accessory as well as related components function properly.
Create a DCM Case
It is recommended to create a case in Dealer Case Management prior to beginning work on a vehicle and to check back after creating the case for additional instructions and other information.
Here is an example template with the information needed when submitting an accessory/reconfiguration case:
- Name:
- Contact Number:
- BAC:
- VIN:
- Accessory/Reconfiguration Requested (include RPO):
- Kit Part Number (if applicable):
- Authorization Code (if applicable):
Get the Authorization Code
Verify any required authorization code is included with the accessory materials before reaching out to TCSC.
In addition, always verify the VIN on the repair order against the VIN plate of the vehicle being worked on so the correct vehicle is updated.
Include Part Numbers and RPOs
Be sure to include any relevant part numbers and RPOs for the accessory and reconfiguration in the DCM case. (Fig. 15) If these are not provided, TCSC may be unable to complete the required update.
Fig. 15
Check Service Information
Check the Service Information for any vehicle requirements needed for the accessory or reconfiguration. For example, new 22-inch tires may require a specific spare tire be installed on the vehicle. (Fig. 16)
Installation sheets for GM Accessories can be found in the Accessories Manuals in the Service Information.
TIP: To help find the correct accessory installation instructions, most GM Accessories come with a single-page sheet that includes the Instruction ID Part Number, which is searchable in the Service Information Accessories Manual for each model.
Fig. 16
Verify Year/Model is Supported
Using the GM Online Order/Reference Guide, verify that the Year/Model vehicle supports the change being requested. Pay particular attention to the specific content and trim level. For example, ZW9 or Fast Flash updates may not be supported on higher trim levels such as LTZ/3LZ in certain cases. (Fig. 17)
Fig. 17
Additional Requirements
Certain reconfigurations, such as speed governors, have additional requirements where it may be necessary to provide photos of any upfits on the vehicle (if RPO ZW9 is present). On vehicles from a fleet company or law enforcement agency, proof of ownership or a letter of approval may be needed before changes can be completed.
Understand System Operation
Once a reconfiguration is completed, be aware of certain circumstances that can prevent an accessory or reconfiguration from functioning properly. Remote start, for example, won’t work if the vehicle is low on fuel, a window is lowered, the hood or a door is open, or the Check Engine MIL is illuminated. (Fig. 18)
Fig. 18
It may be necessary to double-check installation if the accessory is not functioning properly after an update.
Installation Questions
The following sources are available to help dealerships with the installation and operation of GM Accessories.
Techline Customer Support Center – Programming concerns with GM Accessories.
Technical Assistance Center – Installation information or help with diagnosing problems related to the installation.
Partech – Accessory installation sheets, missing kit components, quality issues, and vehicle compatibility questions. Call Partech at 1-855-GMCARES (1-855-462-2737), select prompt 2.
Accessory Distributor Installer (U.S.) – Limited Production Option (LPO) parts
More information about calibrations for Limited Production Option (LPO) Accessories can be found in Bulletin #22-NA-053.
– Thanks to Anthony Guarnieri
