Pinpoint Test C: DTC C1769/C1783: PARK BRAKE APPLY/RELEASE SWITCH SHORT TO GROUND

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

C1 RETRIEVE THE DTCs
- Connect the diagnostic tool.
- Enter the following diagnostic mode on the diagnostic tool: Retrieve the DTC(s).
- Is DTC C1769 retrieved
- Yes : GO to C2.
- No : If DTC C1783 is retrieved, GO to C3.
C2 CHECK CIRCUIT 8-CG15 (WH/BU) FOR AN OPEN
- Disconnect the battery. Refer to CHARGING SYSTEM - GENERAL INFORMATION .
- Disconnect: EPB Switch C3218.
- Measure the resistance between the electronic parking brake (EPB) switch C3218-8, circuit 8-CG15 (WH/BU), harness side and ground.
  
  Fig 1: Measuring Resistance Between Electronic Parking Brake (EPB) Switch C3218-8, Circuit 8-CG15 (WH/BU), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms
- Yes : GO to C3.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. RESET the EPB system. REFER to ELECTRONIC PARKING BRAKE (EPB) RESETTING in this article .
C3 CHECK CIRCUIT 10-CG15 (GY/VT) FOR AN OPEN
- Measure the resistance between the EPB switch C3218-4, circuit 10-CG15 (GY/VT), harness side and ground.
  
  Fig 2: Measuring Resistance Between EPB Switch C3218-4, Circuit 10-CG15 (GY/VT), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms
- Yes : GO to C4.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. RESET the EPB system. REFER to ELECTRONIC PARKING BRAKE (EPB) RESETTING in this article .
C4 CHECK THE EPB SWITCH PIDs
- Using the diagnostic tool, monitor the EPB apply, neutral, and release PIDs while operating the EPB switch.
- Do the EPB PIDs match the EPB switch positions
- Yes : INSTALL a new EPB module. REFER to PARKING BRAKE MODULE in this article . CLEAR the DTCs. REPEAT the self-test. RESET the EPB system. REFER to ELECTRONIC PARKING BRAKE (EPB) RESETTING in this article .
- No : INSTALL a new EPB switch. REFER to PARKING BRAKE SWITCH in this article . CLEAR the DTCs. REPEAT the self-test. RESET the EPB system. REFER to ELECTRONIC PARKING BRAKE (EPB) RESETTING in this article .