WARNING: This page is about a different car, the 2005 BMW 760Li, 2004 BMW 760Li, and 2003 BMW 760Li. However, it is still accessible from the selected car via links, so may be relevant.
ELECTRIC AUXILIARY HEATER - TIGHTENING TORQUE SPECIFICATIONS (1AZ)
Type
thread
tightening specification
Measure
1AZ Battery positive and negative leads to auxiliary heater