Pinpoint Test B: DTC B1484 - Brake Pedal Input Open Circuit

WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

B1 CHECK THE STOPLAMPS
- Apply the brake pedal while observing the stoplamps.
- Do the stoplamps illuminate?
Yes: GO to B2.

No: REFER to STOPLAMPS to continue diagnosis of the stoplamps.
B2 CHECK CIRCUIT 810 (RD/LG) FOR AN OPEN
- Key in OFF position.
- Disconnect: ABS Module C135.
- Measure the voltage between ABS module C135-30, circuit 810 (RD/LG), harness side and ground while applying the brake pedal.
  
  Fig 1: Measuring Voltage Between ABS Module C135-30, Circuit 810 (RD/LG), Harness Side & Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes: GO to B3.

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
B3 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect: ABS Module C135.
- Check for:
  - corrosion.
  - pushed-out pins.
- Connect the ABS module connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes: INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . CLEAR the DTCs. REPEAT the self-test.

No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.