ML320 Work Done- ABS/ETS Lights Still On

[kwmccauley]

The info that follows is for a 1998 ML320 with 190,166 miles. I am the original owner since new. No prior brake issues.

The ABS/ETS lights came on about two weeks ago. I have done all of the things I could come up with in a progressive trouble shooting procedure (least costly parts first).
1. Checked OBD codes. None stored. (Have a few high mileage cars so bought my own code reading/reset tool a few years ago)
2. Battery is 2 years old (Dec. 2005). Voltage checked with voltmeter and is 12.8 volts
3. Brake pads and rotors have about 10k miles on them. Wear is normal. No perceptible wheel bearing play.
4. Checked all four wheel speed sensors for chafing/damage. All wiring appears OK. Removed all four sensor heads, cleaned pick-ups and reinstalled.
5. Replaced brake pedal switch
6. Replaced ABS Relay K25
7. Applied 12VDC and ground to power and ground pins on ABS hydraulic pump. Runs fine.
8. Removed ABS control module from front of ABS hydraulic pump/manifold assembly. Sent out for professional rebuild. Reinstalled.

ABS/ETS Lights still on.

Any recommendations or further ideas appreciated.

NOTE: I have a service appointment Saturday morning (tomorrow) for a brake fluid flush.

Thanks,
Ken