2005 Elise Windshield Wiper Not Working - Fuse OK and Wiper Stalk Replaced - LotusTalk - The Lotus Cars Community
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post #1 of 12 (permalink) Old 03-26-2018, 09:44 AM Thread Starter
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2005 Elise Windshield Wiper Not Working - Fuse OK and Wiper Stalk Replaced

The windshield wiper on my 2005 Lotus Elise has mysteriously stopped working. After I found the issue, I checked the fuse in the interior, and it checked OK. From there, I replaced the wiper stalk with a new part from Blackwatch Racing. Still nothing.

Before I go "gung-ho" taking the front clam off to potentially diagnose the wiper motor, are there any obvious things I am missing that could be a simple fix? I see something called a wiper module in the wiring diagram, but what exactly is this?

I always like to ask these things as the knowledge base is deep on LT.com!

BTW, this was a really fun issue to have competing at NCM motorsports park this weekend in a downpour. Thank you RAIN-X!

2005 Lotus Elise, naturally aspirated and always at redline!
2018 NASA Great Lakes Region TT4 Champion

Last edited by countryboyshane; 03-26-2018 at 10:00 AM.
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post #2 of 12 (permalink) Old 03-26-2018, 09:58 AM
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Have you checked the connector at the wiper motor? You can reach it through the access panel without having to do any major surgery

"Lots Of Trouble; Usually Serious"
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post #3 of 12 (permalink) Old 03-26-2018, 10:00 AM Thread Starter
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Have you checked the connector at the wiper motor? You can reach it through the access panel without having to do any major surgery
What am I looking for on the connector, besides cleaning the contacts and giving it a good snug fit?

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post #4 of 12 (permalink) Old 03-26-2018, 10:17 AM
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The wiper module is a relay under the dash and it could very well be your problem. I replaced mine with another type that allows you to program the delay interval using the wiper stalk. I can provide the info after I get home.

Here is a link to the relay write-up:
https://www.lotustalk.com/forums/f129...ay-hack-22036/

Here is a link to the part:
https://www.ecstuning.com/b-kaehler-...3b0955531~kah/

If you search around I imagine you can find the part for a cheaper price

06 Lotus Elise: Ardent Red, Sport+Touring, ShiftR111, S111 TransCables, LETSLA, Driving lights
02 Honda S2000: Spa yellow, Berk Hi-flow Cat, Alpine head unit, Focal speakers
09 Honda Civic EX Coupe: Stock winter bomber

Last edited by BigHair; 03-26-2018 at 01:27 PM.
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post #5 of 12 (permalink) Old 03-26-2018, 10:28 AM Thread Starter
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The wiper module is a relay under the dash and it could very well be your problem. I replaced mine with another type that allows you to program the delay interval using the wiper stalk. I can provide the info after I get home.
Ah, I see where it is thanks to Sir Lotus:


2005 Lotus Elise, naturally aspirated and always at redline!
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post #6 of 12 (permalink) Old 03-26-2018, 10:53 AM
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What am I looking for on the connector, besides cleaning the contacts and giving it a good snug fit?
It can simply disconnect way too easily. Just a couple weeks ago another user had the same problem, and I have had it happen a couple times before. Usually it is from working near it, but my previous owner had it ziptied, haha. It'll be the connect right at the wiper motor.

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post #7 of 12 (permalink) Old 03-26-2018, 11:52 AM
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Did a quick look at the electrical diagram for the wiper. If you donít have wipers in any position then it points to a wiring/connector issue or a wiper motor assembly failure.

06 Lotus Elise: Ardent Red, Sport+Touring, ShiftR111, S111 TransCables, LETSLA, Driving lights
02 Honda S2000: Spa yellow, Berk Hi-flow Cat, Alpine head unit, Focal speakers
09 Honda Civic EX Coupe: Stock winter bomber
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post #8 of 12 (permalink) Old 04-14-2018, 03:41 PM Thread Starter
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Took another look at this today and first thing I wanted to rule out, was the wiper motor assembly. Thanks to my trusty Power Probe, I sent 12V to the hot side of the wiper motor, and it's working perfectly.

I'm a little confused with how the wiper module functions. I'm assuming this relay is like any other 4-contact version, where 2 contacts are for the low current coil, which switches a switch for high current applied across the other 2 contacts.

When I applied 12V across the "-" and "+" contacts of the relay, no audible switching sound was heard. There is continuity across the contacts. What was weird, was that I measured ~4V across "L" and "W/L" contacts. I wish I knew what these letters meant!

Then this gets weird, I applied 12V to contact "L" and proceeded to switch on the relay, and I can hear and physically feel the relay operating now, and I'm measuring ~11V across contacts "L" and "W/L".

What's even more confusing is the '05 Elise wiring diagram, shows 6 connection points to the wiper module, yet there are physically only 4 contacts on the module?

Does anyone have a better understanding of how to diagnose if this wiper module relay is truly defective or operational?

2005 Lotus Elise, naturally aspirated and always at redline!
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post #9 of 12 (permalink) Old 04-15-2018, 03:41 PM
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The relay has some electronics inside to provide a delay function for the intermittent position of the wiper stalk. The relay that I replaced has 6 pins and the pin identifiers molded into the relay base are consistent with the wiring diagram. (I, 15, 53C, 31, 31B, 53E)

Does the relay you pulled have 6 pins?

The wiper does not use the relay at all for the high speed.
So if the motor assembly is good it could still be a wire issue or power not getting to the wiper stalk.
Another questions:
Does your wiper washer pump work

If it doesn't then it points to a problem with power not getting to the wiper stalk.

06 Lotus Elise: Ardent Red, Sport+Touring, ShiftR111, S111 TransCables, LETSLA, Driving lights
02 Honda S2000: Spa yellow, Berk Hi-flow Cat, Alpine head unit, Focal speakers
09 Honda Civic EX Coupe: Stock winter bomber

Last edited by BigHair; 04-15-2018 at 05:58 PM.
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post #10 of 12 (permalink) Old 04-16-2018, 04:29 AM Thread Starter
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Oh my gosh I'm feeling stupid now. It has to be the wrong relay that I pulled. Guessing I was holding the flasher relay the whole time
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2005 Lotus Elise, naturally aspirated and always at redline!
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post #11 of 12 (permalink) Old 04-16-2018, 05:38 AM
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It's all good, we know that going under the dash to check on a relay is not the easiest thing to do!
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post #12 of 12 (permalink) Old 04-16-2018, 10:22 AM Thread Starter
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Right-o, so much fun contorting my body and using small mirrors to guide my hands. I'm positive that being in good physical shape, and shorter than 5'10" tall, is a Lotus requirement for all service technicians!

2005 Lotus Elise, naturally aspirated and always at redline!
2018 NASA Great Lakes Region TT4 Champion
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