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Can some one do me a small favour?

Nut Kracker

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Hi all.
I've been having a problem with my air con for a long time now.

Apparently, after a diagnostic check of my ECU, there is no signal getting to the ECU when the air con is switched on.
Firstly, I would like to know if there is a mechanical relay, or an electronic relay in the BCM for the air con.
Secondly, could some one please let me know, if they can hear a relay type clicking sound coming from the BCM, when the air con is switched on.

This information would be greatly appreciated and help diagnose my problem immensely.
 

ari666

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Nut Kracker

Donating Member
Joined
Oct 18, 2012
Messages
4,760
Reaction score
149
Points
63
Age
64
Location
Echuca Vic.
Members Ride
VT SS 304ci (195i)
I realise that ari, but I just thought there may be a relay IN the BCM.
Because the wire from the air con switch goes to the bcm first.
Then a serial data wire from the bcm runs to the ecu to turn on the cooling fans and to the iac and also to the air con relay.
I'm just trying to eliminate all possibilities, as I've checked everything else and have a feeling the bcm is not sending a signal to the ecu.
 
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