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Windscreen washer wiper delay 200 92

posted by someone claiming to be Jorn Schreurs on Thu Nov 8 18:16 CST 2001 [RELATED]

Both my previous 240's (84) wiped the windows at least 3-4 times after activating the washer.

My current 240 (92) seems to find single wipe enought. However I don't. Snow has started to fall and with the salt on the road you need to clean your windows every 5 miles or so.

Where is the delay relay located, what does it look like and can it be fixed (or do I need to buy a new one). I can image the condensor has lost it although it does not seems to be temperature effected (unlike the clock problem, which I successfully fixed on previous cars by fitting a new condensor).

Would very much appriciate your input.

Reg,

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Re: Windscreen washer wiper delay 200 92

posted by someone claiming to be Don Foster on Fri Nov 9 10:26 CST 2001 [RELATED]

The wiper relay is hiding under a metal cover at the front left side of the driver's side floor. It's about where a tall driver's left foot might rest against the where the floor meets the firewall.

Pull down the carpet and look for several harnesses disappearing behind a metal panel about 5" wide (12cm), or so. Pull up these harnesses.

The wiper relay is black and is usually wrapped in foam. If you have a wagon, you'll find a second relay -- white for the ordinary rear wiper relay, blue if it has delay sweep -- also wrapped in foam.

What else can I say besides "resolder, resolder, resolder."

Meanwhile, I have a handful of these from older cars -- might be the same.... Don't know what's involved sending one to Oslo...

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Re: Windscreen washer wiper delay - update 200 92

posted by someone claiming to be jorn schreurs on Sun Nov 11 00:09 CST 2001 [RELATED]

Don,

Who else would give me an answer on this one!!

Found the relay real quick, thanks for the instructions. With some basic knowledge of electronics I quickly traced back the delay circuit with the usual capacitor resitor and diode. It worked fine on the test bench, but I replaced the capacitor anyway. A test in the car showed the problem was still there. Opened it up again and this time took the multimeter to measure through. Turned out the diode was shot and feeding current back to the connector. As this is also connected up to the headlight washer, the drain shortened the timing interval.

New diode fixed it all and with the new (heavier) capacitor get at least 4-5 wipes now!

$0.10 makes the daily cruise to work a little more comnfortable. Thanks.

PS used the wifes hairspray to coat the new solder points to protect against corrosion. Learned that one the hard way.

reg,

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Re: Windscreen washer wiper delay - update 200 92

posted by someone claiming to be Don Foster on Sun Nov 11 00:25 CST 2001 [RELATED]

Wow! Good bit of electronic troubleshooting! The diode may have been a "freewheeling" or clamping diode -- often found around motors that must stop on a dime when power is switched off.

"...with the new (heavier) capacitor get at least 4-5 wipes now..."

Did you keep notes of your work? I'd like to modify mine to sweep twice during intermittent cycle. I don't know which capacitor times that portion of the cycle.

"...wifes hairspray to coat the new solder points to protect against corrosion..."

Good idea. With these relays, the problem isn't corrosion. Rather, it's the type or blend of solder used for the automated mass assembly process, "wave soldering" or whatever. It's not the same as solder used on the bench. The solder crystallizes and cracks.

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Re: Windscreen washer wiper delay - update 200 92

posted by someone claiming to be jorn schreurs on Sun Nov 11 08:16 CST 2001 [RELATED]

> Did you keep notes of your work? I'd like to modify mine to sweep

> twice during intermittent cycle. I don't know which capacitor times

> that portion of the cycle.

Hmmm, the side of the board I was working on had only one capacitor, doing the time interval for prolonged sweeping. This one had a capacity of 47 micro Fahrad - I increased this to 100, giving me twice the time (but then due to the broken diode, I never knew the normal time).

The other side of the board has two capacitors, one 47 Micro Fahrad (same as for the wash), the other one 200 or so. Naturally the delay times are also dependent on the resitor value over which the capacitor discarges. Would it not be logical for the 47 Micro F to give the "wiper go" signal and the 200 Micro F to give the intermiting delay? In which case increasing the 47 to 100 Micro F should give you twice as long a "wiper go" signal resulting it two wipes.

Quick to check as it only takes a bit of the magic solder....

Good luck and Reg,

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