1992 → 1995 Edit
There are 2 possible modules located under the dash above the glove box. One is a smallish silver box towards the left (driver's side) that appears to have no writing on the top (hard to see). The other is a larger black box towards the passenger's side with lots of writing on top - EAP 191 959 875 made in Germany 12V etc. The part number of the cruise control module is SGA-004-397-01. It is the small silver one.
1997 → 2001 Edit
The Cruise Control Module is located under the right side passenger AC vent. Photos in this article illustrate the 1997 → 2001 configuration.
There are many components in the Cruise Control system, any of which can fail. The reliability of the Cruise Control Module, however, appears to be rather low. As such, in the absence of exhaustive testing, a rational first step in approaching a cruise control problem would be to have the Module repaired or replaced, and if that doesn't address the problem, proceed accordingly. This [vwforum thread] describes the experience of one individual who pulled several Modules from cars in salvage yards and found that virtually 100% of them had failed. Another posting within that thread goes into detail about how to test a module.
Follow the directions in the captions of the photographs in this article to access and remove the Cruise Control Module.
Module Repair or ReplacementEdit
There are at least three options for dealing with a malfunctioning module.
- Purchase a replacement module. This can be very expensive.
- Send your module to a re-builder. [Module Master] in Idaho is one such re-builder. Module Master replaces all the old solder with stronger solder and replaces weak components. There are also re-builders on EBay.
- Open the module and repair the solder joints yourself.
This [audiworld forum thread] illustrates the contacts to re-solder inside the module if you want to try it yourself. Others have found they ultimately had to re-solder every joint.