Voyager ABS light stays on
 

Hi Everyone
I am a new member and wish to get your help with my Voyager 2.5 crd 2001 ABS warning light which stays on. I have done a resistance check on two sensors, right front and right rear and both give a reading of about 5 mega ohms. Kindly let me know whether this is within the range expected. If not what the rough value?
While the two sensors were disconnected I have turned the ignition on and messured the voltage on each of the sensor cables and they read 11volts.
I have tried to look for the control unit to enable checking the functionality of all 4 wheel speed sensors but no joy. Please point me in the right direction as to where it is located.