2012 Vrs tdi, VCDS has picked up a non functioning nearside temperature sensor in the aircon setup, the indications are there is no Positive feed to the sensor. That explains the lack of cooling that I’ve noticed.

Can anyone clue me in on what colour cable is the positive, and can I just substitute a feed from a new source? I’d like to get the aircon sorted before it gets hot again... 😅

 

Thanx.

Edited 12 June, 20205 yr by warweezil

Which temperature sensor? Give us the exact info that VCDS has generated please.

Assuming this is a Climatronic system, there seem to be temperature sensors L/R in at least two sets of vents, G150/151, plus G261/262 in footwell vents.

The first two are driven from pins 13 (purple/blk) and 14 (purple/wht) - respectively - of a 20-way connector at the control unit. But they're not just 'positive feeds' that you can substitute any old 12V supply into, they are the sensing current source, so must be wired as intended, or the control unit won't measure anything. Earth returns of both G150 and G151 (and the sunlight sensors) go back to pin 17 of same 20-way.

Are you sure it's not the sensor itself that's broken?

9471765 - Temperature Sensor for left vent

B1087 15 [009] - Open or Short to Plus

Confirmed - Tested Since Memory Clear

Freeze Frame

Fault Status: 00000001

Fault Priority: 3

Fault Frequency: 1

 

The sensor was changed for a new OEM part from Skoda but that made no difference.

 

 

Continuity test the wiring in that case.

I have a feeling that I’m going to get very familiar with the wiring on this car, I’ve already made a temporary fix to the drivers door airbag sensor issue and  VCDS has also thrown up an intermittent fault with door lighting. Disappointing that they cheaped out on wiring this way. 

 

Looks like I’ll have to dig the control unit out so I can get at the plug 😫 it’s gonna be a week or so.. I’ll report back when I do get to it.

 

Thanx