64 99... Fault 4.1 Circulation pump
WARNING: This page is about a different car, the 2003 BMW 530i, 2002 BMW 530i, and 2001 BMW 530i. However, it is still accessible from the selected car via links, so may be relevant.
Instruction:
Measure voltage on recirculating pump using peripherals box (pin allocation: refer to DIS circuit diagram) Specified value: approx. 12V
FAULT 4.1 CIRCULATION PUMP TROUBLESHOOTING
| 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) . | |