Bimmerfest - BMW Forums - View Single Post - 2002 E39 ASC BRAKE ABS lights on => Diagnostic Procedure & Parts Location
View Single Post
Old 06-15-2009, 07:21 PM
bluebee's Avatar
bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by 540iman View Post
I would think that it has to be part of the module itself
The more I look this up, the more I think you're right that it's the ABS module masquerading as a series of red-herring errors.

For example, this BMW Bosch 5.7 error resolution says "Inlet/Outlet valve" fault codes could actually indicate a bad ABS control module (having nothing to do with the inlet or outlet valves themselves).

But, if it is actually the inlet valve, it must be inside the hydro unit based on this description of the hydro unit:

The hydraulic unit consist of an aluminum block containing 12 solenoid valves, 2 pressure accumulators and the return pump.
4 inlet solenoid valves (normally open)
2 changeover solenoid valves (normally open)
4 outlet solenoid valves (normally closed)
2 intake solenoid valves (normally closed)

What scares me, if the solenoid valve is actually bad, is it apparently is required to ensure normal braking is possible in the event of a defective control unit. So it's important to locate and test these solenoid valves.
Reply With Quote