2. Measure The Resistance Between The BAS Release Switch Sense (Applied) Circuit And The Sense (Reference) Circuit

With the ignition off.

Disconnect the CAB harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance between the BAS Release Switch Sense (Applied) circuit and the Sense (Reference) circuit in the BAS Brake Booster harness connector.

Fig 1: Measuring Resistance Between BAS Release Switch Sense (Applied) Circuit & Sense (Reference) Circuit

Courtesy of DAIMLERCHRYSLER CORP.

Is the resistance below 5.0 ohms?

Yes >> Repair the BAS Release Switch Sense (Applied) circuit for a short to the Sense (Reference) circuit.
Perform ABS VERIFICATION TEST .
No >> Go to 3