Alfa Romeo Brera/Spider Window Switch Repair
Alfa Romeo 939 Series Oil Temperature Sensor
Frameless windows; what a joy.
Whilst I enjoyed the frameless windows on the Brera and my MiTo, what I didn’t enjoy was the endless calibration of the anti-pinch system after a battery disconnect or if the anti-pinch system got a little confused every other month and thought that they air was impeding its path to close. It isn’t much effort to retrain the system into the correct values, however it becomes a completely different story if the window switch is signalling the wrong up/down motion and causing it to stutter and not complete a full relearn cycle. Unfortunately second-hand window switches are going upwards of £200, and new ones are costing ~£300 as well; so it’s not a cheap fix for more than an annoyance.
Even though the MiTo sold in many more numbers that the Brera or 939 Spider, window switch faults are nowhere near as common as you’d expect from them. MiTo window switches are in common abundance so I purchased one to strip down to view the differences between that and a 939 series one. Although they looks similar, and their internal function is similar, the internal construction and PCB routing including pinout is wildly different so do not plug a MiTo window switch into a Brera/Spider and expect it to work!
I’ve found that a normal clean out of the conductive elements on the PCBs are the main sticking point on the 939 series of window switches, and a light cleaning of the PCB contacts and conductive elements is able to fix 99% of intermittent signalling. I’ve had a fair number of window switches as spares that I purchased, and all of the conductive elements have had some form of corrosion causing poor signalling.
Due to the poor signalling, it seems that people put more and more pressure on their window switch buttons in attempt to increase conductivity. This works for a short period of time, however this increase of pressure on the conductive elements means a higher pressure on the buttons and button pivots, causing the buttons to split down the centre and the pivots to shear off after a period of time. I’ve since designed and can refit new button mounts/pivots which are comparable strength to the originals, if not stronger due to the materials used.
Since these inserts need to be installed with the window switch stripped down, and some minor modification required to the switch, the switch must be sent in to have a new pivot insert installed. It is recommended to install a new button as the same time of the insert, as if a pivot point is sheared then a crack has also begun forming down the centreline of the button – unfortunately new buttons are not easy to come by, and as such are fairly expensive to replace.
We have developed a test bench for all of the functions of the Window Switches, with realtime feedback for buttons pressed and their expected and actual values, meaning a thorough test can be completed both before and after teardown to emulate the signalling the Window ECU would receive on the vehicle.
- Professionally Tested
- Next-Day Repair Service Available
- OEM+ Repair
- <1 Hour Replacement Time
Clientele: Alfa Romeo 939 Series
Compatible Engines: All Engines
Compatible Cars: Alfa Romeo Brera, Alfa Romeo Spider (939)
Release Date: February 1, 2021
Just want to say that George's box of tricks and new sensor were fitted to my 159 by A for Alfa the other day and it works, including the level retaining optional extra. Haven't had much chance to monitor it closely, but it seems to do the job. Thanks George.
Looking at the engine bay you would not know the kit is installed apart from one little black wire from the negative terminal going in to the fusebox. All components such as loom and connectors are very high quality and appropriately weather proofed.
Fitted the switch this morning and it's working perfectly again. Many thanks George, saved me a fortune for a new switch.
Works lovely. Thank you for getting it fixed, much appreciated.
A fantastic solution to the common issue of the failing oil temperature sensor in the Alfa JTS engines. Very straight forward to fit in my 3.2 159, and just simply works. I opted to retain the oil level sensor, which also works great, and adds nothing to the installation. A fantastic product, at a very fair price!
Installed and all working. Thank you very very much!
Installation and calibration was simple. Works great!
Did a great job repairing my window switch, it's as good as new, would highly recommend and would definitely use again.
Temp sensor + retain loom. Installed on my 2006 Brera 3.2 v6, the kit is easy to fit, "invisible" when fitted and built sturdy. I highly recommend it to everyone who doesn't want to drop the oil pan (requires dropping of subframe) to replace the original -expensive- oil sensor.
This is a brilliant product. Simple to fit and does exactly what it says on the tin at an absolute fraction of the cost of replacing the original Alfa oil temperature sensor.