Engine Controls - Theory & Operation: Relays
- Fuel Pump Relay: See FUEL PUMP RELAY under FUEL SYSTEM in this article.
- Main Relay: See MAIN RELAY under INPUT DEVICES in this article.
- Oxygen Sensor Heater Relay: See OXYGEN SENSOR HEATER RELAY under FUEL CONTROL in this article.
RELAY LOCATIONS
| Relay | Location | |
|---|---|---|
| Fuel Pump Relay | ||
| 325 Series | On Bracket On Left Front Shock Tower(Center Relay On Bracket) | |
| 525i,535i & 735i Series | In Relay Box In Right RearCorner Of Engine Compartment | |
| Main Relay | ||
| 325 Series | Left Front Shock Tower | |
| 525i, 535i & 735i Series | In Relay Block, BehindRight Front Strut Tower | |
| Oxygen Sensor Heater Relay | Behind Right Front Strut Tower | |
| Starter Relay | Left Rear Of Engine Compartment | |