# Service bulletin TT469

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: 10167357
- Published by NHTSA: 2019\-11\-08
- Manufacturer's number: TT469
- Manufacturer's date: 2019\-10\-18
- NHTSA component: UNKNOWN OR OTHER; ELECTRICAL SYSTEM; EQUIPMENT

## NHTSA's summary

TECHNICAL TIP BULLETIN TT469: PREVENTING LEARNED MODULE DATA. PURPOSE: When troubleshooting a vehicle, it is sometimes in a technician’s best interest to try a test module before confirming the diagnosis and ordering a new part. In a CAN \(Controller Area Network\) system, the vehicle’s modules will learn data from the other connected modules. This can result in one or more modules learning data which may cause negative side\-effects. This can either affect the vehicle being diagnosed or the donor vehicle depending on the circumstance. Resolution: When removing and installing modules, always follow the procedures in the service and electrical diagnostic manuals. This tech tip does not take precedence over those procedures. For all module swaps, verify the donor bike uses the same part number module as the vehicle that is being troubleshot. Additionally, refer to TT469 for more module\-specific information.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2019/MC-10167357-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2019/MC-10167357-9999.pdf)

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

## Components

Electrical system, Equipment and accessories

## Vehicles listed

- HARLEY\-DAVIDSON HARLEY\-DAVIDSON

JSON: [/v1/bulletins/10167357](/v1/bulletins/10167357)

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