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

B1 CHECK THE STOPLAMPS
- Apply the brake pedal while observing the stoplamps.
- Do the stoplamps illuminate?
- Yes : GO to B2.
- No : REFER to EXTERIOR LIGHTING 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 the ABS module connector C135-30, circuit 810 (RD/LG), harness side and ground while applying the brake pedal.
  
  Fig 1: Checking Circuit 810 (RD/LG) For Open
  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 the ABS module connector.
- 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.