Cooling fan issues, cant find the bitron controller

[Leedunn86]

Right I'm stumped be trying for weeks to get the fans to work on my car, the cars a 306 hdi estate Y reg with AC, first checked all the fuses, then the relays which look like new g cartier ones, pulled the wiring connection off cleaned it up still nothing. The thing i don't understand I've been looking for the bitron unit under the wheel arch liner and cant find one at all. Tried bridging the connections on the brown plug both 1/2 and 1/3 and the fans didn't budge. Did some late 306's not have a bitron unit maybe controlled by the ecu instead ? Could both fans be dead is there anyway to check ?

[cully]

yes late hdi was ecu controlled no bitron unit

[Leedunn86]

Ah balls not liking the sound of that, is it likely to be dead fans instead? Would plugging it in to a code reader tell me whats up with it if its ecu controlled ?

[cully]

Peugeot planet can test the fans via the ecu outputs
but do check the fuses first as i think there are three fo the hdi system

and yes it is likely that 1 fan has packed up not letting the fans work at slow speed
easy to test though via the relay sockets with the relays removed

i had an issue with one fan fubard so one only worked at full speed and none at low speed
replaced the faulty fan and now both work

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drawings here for the hdi 3 plug ECU

http://306oc.co.uk/forum/thread-11246-po...#pid223155

[Toms306]

My HDi had a brown unit marked 'Bitron' up by the ECU. Is that the same as the old black box on the XUDs or is Bitron just a maker?

[Leedunn86]

My HDi had a brown unit marked 'Bitron' up by the ECU. Is that the same as the old black box on the XUDs or is Bitron just a maker?

Think that has something to do with the fuel pump, bitron is the manufacturer peugeot use g cartier ones too, the one by my ecu is black on mine. Going to wait till the weekend and take the bumper off see if i can run direct wires to the fans to check if they work