Hi,
Thanks I'll check it out.
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DD - 306 dash switches are push-push - when switched on, the warning lamp lights and the switch partially pops out again. As this is a mechanical action, I don't see how a failed relay can cause the switch to pop fully out (tho' I can see why the lamp would go off).
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Pug306xldt - I assume you mean that the indicator light goes out as soon as you take your finger off the switch, and the heated rear window isn't getting hot.
I vote (with DD) for a faulty relay/timer. When you press the switch you send 12 volts to the relay/timer, which is then supposed to latch on for a specified length of time (don't know how long because I always turn my HRW off before it times out). If the relay/timer is switching but not latching, you will get a circuit through the indicator light while your finger is pressed but the light will got out as soon as you let go.
Ian
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Just want to add: If the timer/relay is working properly, and is ON, then pressing the switch again sends another 12 volt pulse which will unlatch (turn off) the relay.
Ian
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Andrew and Ian have covered most of it but while test driving a 1996 306 in today I fiddled with the HRW switch to see exactly what you might be experiencing.
Sit in the car with the ign on and the engine off.
When you push in the HRW switch you will see the lamp on the switch come on and a relay near the dash click, as you release the switch it will come all the way out and you will notice the lamp that shows through the orange top on the switch appear to go out. Only if it is very dull or you cup your hand round the switch will you see it is still on.
Then as you push the switch in to turn off you will see the warning lamp get bright again as the top of the switch gets closer to the bulb (if that makes sense). Then the relay will click off and the lamp goes out.
Note the foglamp and hazard warning lamp switches either side of the HRW switch *do* latch down and may make you think this one should too.
MM
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Hi,
Thanks I shall have a look tomorrow.
Thanks for your help.
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MiddleMan - I sat in the car like you said, and when you push the switch in it doesn't light up at all, it will only light up if you have your head lights on.
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Hi,
Yes the indicator light gos off as soon as you take your finger off the switch, but if you keep the switch pushed in it will stay on.
Sometime it seems like its working because the rear window clears, but other times it doesn't seem to be working.
I have no problems with the rear fog lights or hazard light switches they both work ok.
How would I solve the problem if its a faulty relay/timer?
Thanks for your help
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MM's description of the HRW operation sounds to me like he's found another 306 with dodgy wiring. So I've been out and checked my own. This is the correct operation for a 1993 diesel 306XRDT (petrol might be different) ...
Ignition off or in first position (accessories) - nothing happens when the HRW switch is pressed.
Ignition in second position (glow plugs) or engine running -
1. Press and hold the HRW switch in. The relay clicks but the indicator light does not come on.
2. Release the HRW switch. The light comes on just before the switch is fully released (this surprised me).
3. Press the HRW switch a second time. The relay clicks and the light goes out at the same time while pressing the switch in.
To replace the relay, open the fuse box lid by the driver's right leg (quarter turn on screw). The HRW relay is the orange cube, second from the right, just above the fuses. It just pulls out.
Ian
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IanT - Thanks for your help,
I shall try the steps like you said and see if that works, if not then I will change the HRW relay.
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>>MM's description of the HRW operation sounds to me like he's found another 306 with dodgy wiring.
It doen't really matter Ian but what I described was how the button operated on the 1996 1.4 petrol that was here yesterday. The HRW operated fine (the relay "latching" and the window clearing mist) and my only complaint was that the warning lamp wasn't easy to see.
MM
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IanT - I have done like you said, and the switch doesn't light up at all, I didn't even hear the relay click.
I will have to change the relay it just doesn't seem to be working.
But when the headlights are on, the switch is lit up bright orange, when you press the switch the orange light gos really dull, then when you let go off the switch the light gos bright orange again.
Could this still be a faulty relay causing this problem.
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You have already changed the switch once, so the only remaining possibilities are the relay, the fuse or the wiring.
Check the fuse next (should be fuse 23, but double check the label on the fuse box lid). If that's OK then change the relay. If that doesn't work, you're in trouble.
Your description is still consistent with a faulty relay. The switch uses the same bulb for both night-light operation (fuse 9) and for HRW ON (fuse 23). When headlights are on, all switches should have the same middling brightness. When the HRW is on, the HRW switch should be very bright. While pressing the HRW switch the indicator light temporarily goes off - I don't really understand this behaviour, but I guess it is to avoid interference between the night-light circuit and the HRW ON circuit.
Ian
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Hi,
Thanks I will check the fuse, and if thats ok then I will replace the relay with a new one.
Hopefully this will sort it.
Thanks again
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Pug306xldt,
Did the relay cure the problem.I have a Citroen Zx (1993)model with similar ,if not the same symptoms i.e. the switch light only comes on when the headlights are on and I cannot hear the relay cut in when the switch is depressed and the HRW does not seem to work at anytime.
regards
stevenm
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