Beetle MKIV 1.8T Automatic Rear Spoiler Operation

[RCC]

I am trying to determine the trigger process of the factory rear spoiler.

I am interested in the exact chain of components that automatically activate the rear spoiler.

I have viewed the Bentley Paper and DVD service manuals, spoken with VW master techs. and VW/Audi performance techs., still I have found no definitive answers.

Does anyone have “factual” information regarding this subject?

 

[Uwe]

I think it just listens on the CAN bus for vehicle speed messages?

-Uwe-

 

[DrPeter]

Hello,

I am trying to determine the trigger process of the factory rear spoiler.

I am interested in the exact chain of components that automatically activate the rear spoiler.

Does anyone have “factual” information regarding this subject?

The J223-Rear Spoiler Control module receives the 'Vehicle Speed Signal' from the J285-Instrument Cluster via the (A27) circuit, a purple/yellow wire from the T12/7 on the J223 to the T32/3 (blue/white) wire at the J285, the wire changes color after the T5c/4 connector located on the right side C-pillar.

All this information can be found looking at the wiring diagrams for the 'Rear Spoiler'. Best to use the Official Factory Repair Information for wiring diagrams.



Hope this helps,

drpeter

 

[RCC]

Thank you both for your input.

 

[RCC]

Okay, Yes, I realize that this thread is a bit old, however, I have discovered some interesting information regarding the Phantom Rear Spoiler issue that I have been dealing with for years, a problem that no one has been able to resolve, including Volkswagen/Audi master tech's.

I have found that among many other things, the ABS Pump/Module assembly is in the loop and plays a direct part in the operation of the Rear Electronic Spoiler on MKIV 1.8T Beetles.

I have discovered that the ABS Block assembly in these cars can cause an array of anomalies in the gauge Cluster as well as other areas depending on how it fails, sometimes without registering a code for the apparent effected area(s), making some diagnosis' difficult.