Hydraulic Pressure Switch Test
Ensure the following fuses are intact and power steering fluid level is correct:
- 325 Series - No. 4, 5, 6 and 12
- 525i and 535i - No. 1, 15, 17, and 20
- 735i - No. 10 and 12
Switch closes when pressure is below 21.3 psi (1.5 kg/cm2 ). To check switch, remove switch and install pressure gauge to verify hydraulic pressure. If pressure is at or above specification, install new switch. Switch is located in front of coolant reservoir on top of shock tower.