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Old 12-31-2018, 11:33 AM
80stech 80stech is offline
Join Date: Mar 2016
Location: Saskatchewan Canada
Posts: 882
80stech is on a distinguished road
Some more thoughts on the temp gauge/sender--I'm thinking that the 2 sides of the sender are used to give a more linear and accurate reading through a broader range. The DME side(higher resistance) is used for the upper range and the gauge side(lower resistance) is used for the lower range. Information is exchanged on the bus between the DME and the cluster. If one side fails the other is used to get close and if both fail the air charge sender(and mapping) gets used. This seems to be what's going on from what I have been able to find out. So, accurate and robust, and nice that BMW is using actual temps in the coding instead of digital voltages from the DACs. I haven't done any coding for the warning light temp but will mess around a bit more when I do.
1988 325is (purchased new)
2004 X5 3.0 (new to me) 2005 X3 2.5 (new to wife)
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