Aircon Problem

[cyborgguy]

My Aircon is not working :( The light on the switch works but it isn't kicking in.

I have checked the fuse in the drivers footwell and it is fine ,I have checked the relay in the engine bay and it is fine. Shorting out the relay terminals kicks in the aircon and it is operational so the problem is an electrical one. between the aircon switch and the relay....

Anyone got an idea of what could be wrong?

Is there a self diagnostic procedure?

[Jiberjaber]

Have you tried taking the controls out and shorting the connector to see if the wire is still continouse from the control to the relay... that would prove if it is the switch that has gone faulty or not. The light comming on is usualy a seperate "way" on the switch.

[cyborgguy]

I haven't tried this yet ,I guess there is no easy way to do this without opening up the switch controls unless you know which are the wires coming out the back of the unit?

PS.Thanks for your speedy reply!

Have you tried taking the controls out and shorting the connector to see if the wire is still continouse from the control to the relay... that would prove if it is the switch that has gone faulty or not.  The light comming on is usualy a seperate "way" on the switch.

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[Jiberjaber]

NP - I am sure one of the guys with the maintenance mannual will be along shortly to let you know :) There is an artical in teh Workshop area on how to remove the bits you need to get at the leads.

[ColinBarber]

You need to find out why the control module isn't switching on the AC. I wouldn't think it is a wiring fault as these are rare.

There are a number of inputs to the control module that need to be correct before it will switch on the AC, if these fail or the AC module cannot communicate with the engine ECU then it will not work.

There should be a diagnostic procedure to recover any error codes although it is probably part of the OBD-II system so you will need a scanner to get the codes. Somebody with IS workshop manuals should be able to confirm this.