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Its the relay that makes or breaks the power to (archive)
[ Follow Ups ] [ 7-series (E32) Message Board ] [ Msg. Board FAQ ]
Posted by Rainman. on April 15, 2002 at 10:30:13:

In Reply to: "Power Protection Relay" - what does it do? posted by Eric on April 14, 2002 at 12:24:32:

central locking system, windows and sunroof. If it detects an amp draw in excess of 30 amps for more than .30 seconds or a draw of 50 amps period it breaks the circuit, Its protecting these devices hence the name power protection relay.

My car was draining the battery over about 24hours. I finally found a problem with the HVAC control ECU ('IHKA' unit). However, even with the IHKA disconnected, I have a current drain of about 0.3A
I subsequently discovered that the 'power protection relay' (fitted at the side of the rear power distribution panel) is permanently active (slightly warm all the time). What does this relay do? It appears to connect only to the General Module.

Eric




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