64 99... Fault 4.1 Circulation pump
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 BMW 540i, 2002 BMW 540i, 2001 BMW 540i, 2000 BMW 540i, and 1999 BMW 540i. However, it is still accessible from the selected car via links, so may be relevant.
Instruction:
Measure voltage on recirculating pump using peripherals box. See appropriate SYSTEM WIRING DIAGRAM.
Specified value: approx. 12V
CIRCULATION PUMP FAULT DESCRIPTION
| Question | Measure | |
|---|---|---|
| Is supply voltage O.K.? | No | Replace independent parking heater control unit, refer to 64 12 520 REMOVING AND INSTALLING / REPLACING CONTROL UNIT WITH HEAT EXCHANGER (THERMO TOP S) |
| Yes | ||
| Replace circulation pump, refer to 64 12 540 REMOVING AND INSTALLING / REPLACING CIRCULATION PUMP (THERMO TOP S) |