Inspection and Verification

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.

Verify the customer concern by operating the EPB system.

Visually inspect for obvious signs of mechanical or electrical damage. Refer to the following 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 (BJB) fuse 19 (30A) Central junction box (CJB) fuse 7 (5A) Connector(s) or connections Circuitry EPB module

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
If the diagnostic tool does not power up, refer to the diagnostic tool manual.
Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
- SCP, ISO or UBP circuit faults; all electronic control units no response/not equipped, refer to MODULE COMMUNICATIONS NETWORK .
- No response/not equipped for the EPB module, GO to PINPOINT TEST A .
- System passed, retrieve and record the continuous DTCs and carry out self-test diagnostics for the EPB module.
If the DTCs retrieved are related to the concern, go to the ELECTRONIC PARKING BRAKE (EPB) SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART to continue diagnostics.

ELECTRONIC PARKING BRAKE (EPB) SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) INDEX

DTC	Description	Source	Action
B1317	Battery Voltage High	EPB	GO to PINPOINT TEST A .
B1318	Battery Voltage Low	EPB	GO to PINPOINT TEST A .
B1342	ECU is Defective	EPB	INSTALL a new EPB module. REFER to PARKING BRAKE MODULE in this article .
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 CONFIGURATION .
C1094	Park Brake Apply Switch Circuit Failure	EPB	GO to PINPOINT TEST B .
C1408	Parking Brake Release Switch Circuit Out of Range	EPB	GO to PINPOINT TEST K .
C1409	Parking Brake Apply Switch Circuit Out of Range	EPB	GO to PINPOINT TEST K .
C1769	Park Brake Apply Switch Circuit Short To Ground	EPB	GO to PINPOINT TEST C .
C1782	Park Brake Release Switch Circuit Failure	EPB	GO to PINPOINT TEST B .
C1783	Park Brake Release Switch Circuit Short to Ground	EPB	GO to PINPOINT TEST C .
C1784	EPB Motor Output Short to Ground	EPB	GO to PINPOINT TEST D .
C1785	EPB Motor Output Open Circuit	EPB	GO to PINPOINT TEST E .
C1786	EPB Motor Output Battery Short to Ground	EPB	GO to PINPOINT TEST F .
C1799	Hall-effect Circuit Failure	EPB	GO to PINPOINT TEST G .
C1801	Motor Engage Current Reached Before Full Apply Travel Distance	EPB	GO to PINPOINT TEST H .
C1802	Motor Engage Current Not Reached or Traveled Too Far Upon Apply	EPB	GO to PINPOINT TEST H .
C1803	Motor Disengage Full Travel Distance Not Reached Upon Release	EPB	GO to PINPOINT TEST H .
C1987	Yellow Fault Warning Lamp Indicator Short to Voltage	EPB	GO to PINPOINT TEST I .
C1988	Yellow Fault Warning Lamp Indicator Circuit Failure	EPB	GO to PINPOINT TEST I .
C1989	Parking Brake Apply and Release Switch Contacts Energized Simultaneously	EPB	GO to PINPOINT TEST J .
U1027	SCP Invalid or Missing Data for Engine RPM	EPB	GO to PINPOINT TEST L .
U1040	SCP Invalid or Missing Data for Vehicle Speed	EPB	GO to PINPOINT TEST L .
U1051	SCP Invalid or Missing Data for Brakes	EPB	GO to PINPOINT TEST L .
U1058	SCP Invalid or Missing Data for Transmission/Transaxle	EPB	GO to PINPOINT TEST L .
U1134	SCP Invalid or Missing Data for Ignition Switch/Starter	EPB	GO to PINPOINT TEST L .
U1262	SCP Communication Bus Fault	EPB	REFER to MODULE COMMUNICATIONS NETWORK .