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Old 12-08-2010, 06:19 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
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Mein Auto: 02 BMW 525i M54 auto 130K
I haven't done the autopsy of the thermostat yet, but this reference from Rajaie of Beisan Systems details one way to test the thermostat operation:

"P1619 is a thermostat electrical code. Make sure the electrical cable connector is connected. You can try cleaning the connectors with electrical contact cleaner. There is a common problem with the thermostat where the heater circuit fails. You need to replace the thermoset for this. This failure can cause the heater circuit resistance to drop to 3 ohm and cause a 4A current to run through the cable wires. This can melt the wire insulation and cause the wires to short. Check the thermostat electrical cable wires just below the connector. Check ~3" of wire."

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