motherboard for heated seat buick lucerne

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Hardware Junkie
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Post by Hardware Junkie »

I've had some luck with salvage yards in the past as well. Its worth a look or find a mechanic that can find used parts (which usually means from cars that have have been stripped for parts when they ended up in accidents).

Dark areas on connectors are usually poor connections, like Karlsweldt said. Sometimes the components before and after the connector are not operating correctly and where the dark area forms, is the weakest area.
Part looks fairly complicated though.
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Post by Karlsweldt »

Part looks fairly complicated though.
Indeed. It is a multi-function module that controls the front and rear seat heater circuits (but not all in one module).. and possibly a steering wheel heater, outside mirrors or rear window defroster, on certain model vehicles! The module is typically located under the seat, up above where it may encounter moisture or injury. But the connector wires may be stressed with constant seat movement, or the "junk" that ends up under the seats!! Some models have only the input power connector, while others may have input power and also control input connections.
Any amount of moisture that gets into the power plug contacts can cause loss of current flow.. and resistive heating, which causes rapid degradation of the plug and socket contacts. The female part of the connection is typically a thin copper sleeve, tinned tor corrosion resistance. But it does not have great value as to form retention. The power connector may carry 15 amps or more when in use.
Check this link for some vehicles.
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Re: motherboard for heated seat buick lucerne

Post by Sully007 »

How do you pull the clips off of the wires going into the motherboard?
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Re: motherboard for heated seat buick lucerne

Post by Karlsweldt »

Welcome to Motherboards.org, Sully007. An old thread, but info may still be of need to someone.
The plug that goes into sockets on the board has a retaining clip on one side, lift slightly away to pull out the plug.
As to the wire terminals in the plug, there usually are 'fingers' at the base of the pin or sleeve that keep it in the plug.
A bit of small copper or steel tubing that just slips over the pin or sleeve will compress those 'fingers' for removal. There are special tools for that need.
Other types of plugs or sockets are molded to the wires and connectors.
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Re: motherboard for heated seat buick lucerne

Post by Sully007 »

How do you test the module ?
Last edited by Sully007 on Thu Nov 05, 2015 9:28 am, edited 1 time in total.
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Re: motherboard for heated seat buick lucerne

Post by Karlsweldt »

As to the identity of the module (model, style and function) there is a tag on the board. This is a reference part number.
As to testing the board, best left to the dealer mechanic.. who has all the specifics, schematics and test tools.
Look over the module for any burnt or corroded traces, bad capacitors and other possible failed parts.. maybe damaged from water.
May be only a fuse has blown, disabling the module's feature. Or a poor wire connection, either at the module or in the control switch for it.
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Re: motherboard for heated seat buick lucerne

Post by Sully007 »

So will the dealer test this for a price?
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Re: motherboard for heated seat buick lucerne

Post by Sully007 »

Does anyone know what the yellow/grey wire does? Seems like that is the one that overheated. See pictures.
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Re: motherboard for heated seat buick lucerne

Post by Karlsweldt »

Dealers and 99.9% of service stations do charge a minimal labor charge, for "quick" tests.. typically 1/2 hour rate. Dealers charge a lot more than regular service stations. If a good customer or with something in warranty, likely no cost.
Wire colors are specific to a function. Many are single color wires, others have colored stripes. A schematic diagram is your best reference. Could be more than 50 color combinations in automotive wiring.
Those modules have multiple functions, controlling two seat heaters and have thermostats for control. Plus other heated features like mirrors and steering wheel. Not all vehicles have all the features.
If a wire end looks melted or burnt, the probable cause is poor contact with its terminal. Only fix is replacement.

Please do not duplicate postings.
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Re: motherboard for heated seat buick lucerne

Post by Ron NY »

People..... Look up Ford part # BU5Z-14C724-A. It is identical to GM part # 20806164. Priced for about 1/3rd less...
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