Detection of a promoter module is not strictly coupled to promoters. Functional modules are also present in enhancers.
Modules require a promoter context to be functional in transcription control.
Modules may occur outside regulatory regions as sequences with no transcriptional function. There is a detailed tutorial by Genomatix on how to find common modules . This analysis yields all potential binding sites that may occur anywhere in the genome. The detected organizational framework is common to all or a user-defined percentage of the analyzed promoters. Individual promoters may contain additional functional transcription factor binding sites not included in the framework.