37 22 540 Replacing Air Supply Unit (Ride-Height Control)
WARNING: This page is about a different car, the 2006 BMW X5, 2005 BMW X5, and 2004 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Danger of injury! Drain the air spring system before carrying out any work on the air supply unit, air pipes and air springs! Danger of injury if this instruction is not complied with!
Risk of damage! The vehicle must not stand on its wheels when the air spring struts and air springs are depressurized! Otherwise the air spring struts and air springs will be damaged and later destroyed during driving!
Risk of damage! The vehicle must not stand on its wheels when the air spring struts and air springs are depressurized! Otherwise the air spring struts and air springs will be damaged and later destroyed during driving!
Extreme cleanliness must be ensured in the connection area of the pipes during removal and installation. Even the smallest of dirt particles can cause leakage in the air spring system.
Risk of damage! The vehicle must not stand on its wheels when the air spring struts and air springs are depressurized! Otherwise the air spring struts and air springs will be damaged and later destroyed during driving!
Risk of damage! The vehicle must not stand on its wheels when the air spring struts and air springs are depressurized! Otherwise the air spring struts and air springs will be damaged and later destroyed during driving!
Extreme cleanliness must be ensured in the connection area of the pipes during removal and installation. Even the smallest of dirt particles can cause leakage in the air spring system.
NOTE:
Read and comply with notes on air spring system. Refer to 37 00 ... NOTES ON AIR SPRING SYSTEM .
Necessary preliminary tasks:
- Deactivating air spring system:
- Raise vehicle on lifting platform
- Remove ignition key
- Pull fuse for control unit
- Remove spare wheel/emergency wheel
- Secure removal aid to luggage compartment floor trim panel
NOTE:
Wait approx. 2 minutes until pressure has been completely reduced (hissing sound ceases).
Carefully slacken banjo bolts until the sound of escaping air can be heard.
Installation:
Check banjo bolts for dirt, clean if necessary.
Connect pipes (same color to same color). Carefully insert banjo bolts by hand in order to avoid damaging air supply unit.
Tightening torque 37 12 3AZ. Refer to INTEGRATED SUSPENSION SYSTEMS - TIGHTENING TORQUES X5 (4.4i) N62 .
Release banjo bolts and disconnect plug connection. Remove plug housing with distributor from mounting bracket.
IMPORTANT:
Risk of damage! Do not kink, twist or crush pipes.
Release screw (1). Expose wiring harness with pipes up to air supply unit. Unfasten screws (2). Remove air supply unit (3) with wiring harness and pipes.
After installation:
- Activating and filling air spring system:
- Insert fuse in corresponding slot in fuse box
- Connect BMW diagnosis system
- Switch ignition on
- Fill rear left or right air spring using the BMW diagnosis system (control unit functions -> component activation: activate menu items "Fill rear left/right air spring" once)
- Check pressure at the air springsNOTE: If an air spring feels soft, carry out troubleshooting on the air supply unit, refer to 37 90 ... TROUBLESHOOTING ON LEVEL CONTROL SYSTEM
- Set vehicle down on its wheels