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Electronic Parking Brake (EPB)

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the customer concern by operating the EPB system.
  2. Visually inspect for obvious signs of mechanical or electrical damage. Refer to the following chart. See VISUAL INSPECTION CHART .
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Parking brake cable(s)
    • Parking brake actuator
    • Parking brake shoes or related components
    • Rear brake caliper
    • EPB switch
    • Front battery junction box (FBJB) fuse 15 (40A)
    • Battery junction box (BJB) fuse 12 (5A)
    • Damaged or corroded connector(s)
    • Damaged or corroded wiring harness
    • EPB module
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  4. If the diagnostic tool does not power up, refer to the diagnostic tool manufacturer's manual.
  5. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
    • SCP circuit faults; all electronic control units no response/not equipped, refer to MODULE COMMUNICATIONS NETWORK .
    • No response/not equipped for EPB module, refer to MODULE COMMUNICATIONS NETWORK .
    • System passed, retrieve and record the continuous DTCs and carry out self-test diagnostics for the EPB module.
  6. If the DTCs retrieved are related to the concern, go to the Electronic Parking Brake (EPB) System Diagnostic Trouble Code (DTC) Index. See ELECTRONIC PARKING BRAKE (EPB) SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
  7. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART  to continue diagnostics.
    FRONT ELECTRONIC MODULE (FEM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX

    DTC Description Source Action
    B1342 ECU Is Defective FEM INSTALL a new FEM. REFER to MODULE COMMUNICATIONS NETWORK .
    B1990 Pedal Forward/Rearward Potentiometer Feedback Circuit Failure FEM Go To PINPOINT TEST D: DTC B1990: PEDAL FORWARD/REARWARD POTENTIOMETER FEEDBACK CIRCUIT FAILURE .
    B2358 Adjustable Pedal Switch Failure FEM Go To PINPOINT TEST B: DTC B2358: ADJUSTABLE PEDAL SWITCH FAILURE .
    ELECTRONIC PARKING BRAKE (EPB) SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) INDEX

    DTC Description Source Action
    B1317 Battery Voltage High EPB Go To PINPOINT TEST E: DTC B1317/B1318 - BATTERY VOLTAGE HIGH/LOW .
    B1318 Battery Voltage Low EPB Go To PINPOINT TEST E: DTC B1317/B1318 - BATTERY VOLTAGE HIGH/LOW .
    B1342 ECU Is Defective EPB INSTALL a new EPB module. REFER to PARKING BRAKE .
    B2477 Module Configuration Failure EPB
    NOTE: The EPB module is delivered from the manufacturer with this DTC. The EPB module will not operate until it has been configured.
    CONFIGURE the EPB module. REFER to MODULE COMMUNICATIONS NETWORK .
    C1094 Park Brake Apply Switch Circuit Failure EPB Go To PINPOINT TEST F: DTC C1094/C1782: PARK BRAKE APPLY/RELEASE SWITCH CIRCUIT FAILURE .
    C1408 Parking Brake Release Switch Circuit Out of Range EPB Go To PINPOINT TEST O: DTC C1408/C1409: PARKING BRAKE APPLY/RELEASE SWITCH CIRCUIT OUT OF RANGE .
    C1409 Parking Brake Apply Switch Circuit Out of Range EPB Go To PINPOINT TEST O: DTC C1408/C1409: PARKING BRAKE APPLY/RELEASE SWITCH CIRCUIT OUT OF RANGE .
    C1769 Park Brake Apply Switch Circuit Short To Ground EPB Go To PINPOINT TEST G: DTC C1769/C1783: PARK BRAKE APPLY/RELEASE SWITCH CIRCUIT SHORT TO GROUND .
    C1782 Park Brake Release Switch Circuit Failure EPB Go To PINPOINT TEST F: DTC C1094/C1782: PARK BRAKE APPLY/RELEASE SWITCH CIRCUIT FAILURE .
    C1783 Park Brake Release Switch Circuit Short To Ground EPB Go To PINPOINT TEST G: DTC C1769/C1783: PARK BRAKE APPLY/RELEASE SWITCH CIRCUIT SHORT TO GROUND .
    C1784 EPB Motor Output Short To Ground EPB Go To PINPOINT TEST H: DTC C1784: EPB MOTOR OUTPUT SHORT TO GROUND .
    C1785 EPB Motor Output Open Circuit EPB Go To PINPOINT TEST I: DTC C1785: EPB MOTOR OUTPUT OPEN CIRCUIT .
    C1786 EPB Motor Output Battery Short To Ground EPB Go To PINPOINT TEST J: DTC C1786: EPB MOTOR OUTPUT CIRCUIT SHORT TO BATTERY .
    C1799 Hall-effect Circuit Failure EPB Go To PINPOINT TEST K: DTC C1799: EPB HALL-EFFECT CIRCUIT FAILURE .
    C1801 Motor Engage Current Reached Before Full Apply Travel Distance EPB Go To PINPOINT TEST L: DTCS C1801, C1802 AND C1803: EPB ACTUATOR APPLY/RELEASE FAULTS .
    C1802 Motor Engage Current Not Reached or Traveled Too Far Upon Apply EPB Go To PINPOINT TEST L: DTCS C1801, C1802 AND C1803: EPB ACTUATOR APPLY/RELEASE FAULTS .
    C1803 Motor Disengage Full Travel Distance Not Reached Upon Release EPB Go To PINPOINT TEST L: DTCS C1801, C1802 AND C1803: EPB ACTUATOR APPLY/RELEASE FAULTS .
    C1987 Yellow Fault Warning Lamp Indicator Short To Battery EPB Go To PINPOINT TEST M: DTCS C1987/C1988: YELLOW EPB FAULT WARNING INDICATOR SHORT TO BATTERY/CIRCUIT FAILURE .
    C1988 Yellow Fault Warning Lamp Indicator Circuit Failure EPB Go To PINPOINT TEST M: DTCS C1987/C1988: YELLOW EPB FAULT WARNING INDICATOR SHORT TO BATTERY/CIRCUIT FAILURE .
    C1989 Parking Brake Apply and Release Switch Contacts Energized Simultaneously EPB Go To PINPOINT TEST N: DTC C1989: PARK BRAKE APPLY AND RELEASE SWITCH CONTACTS ENERGIZED SIMULTANEOUSLY .
    U1027 SCP Invalid Or Missing Data for Engine RPM EPB REFER to MODULE COMMUNICATIONS NETWORK .
    U1040 SCP Invalid Or Missing Data for Vehicle Speed EPB REFER to MODULE COMMUNICATIONS NETWORK .
    U1051 SCP Invalid Or Missing Data for Brakes EPB REFER to MODULE COMMUNICATIONS NETWORK .
    U1058 SCP Invalid Or Missing Data for Transmission/Transaxle EPB REFER to MODULE COMMUNICATIONS NETWORK .
    U1134 SCP Invalid or Missing Data for Ignition Switch/Starter EPB REFER to MODULE COMMUNICATIONS NETWORK .
    U1262 SCP Communication Bus Fault EPB REFER to MODULE COMMUNICATIONS NETWORK .
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