Pinpoint Test E : The Parking Brake Does Not Hold The Vehicle, Does Not Apply, Does Not Release Using The Parking Brake Switch Or Automatic Release Function

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

E1 CHECK FOR ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

NOTE: A HS-CAN issue or concern results in a failure to release the parking brake.

Ignition ON.

Using a diagnostic scan tool, carry out the ABS module self-test.

Are any of the Diagnostic Trouble Codes (DTCs) listed in the DTC Fault Trigger Conditions table present in the ABS module?

Yes

GO to E4

No	If there are any "invalid data" or "no communication" Diagnostic Trouble Codes (DTCs) present, GO to DTC Chart: Anti-Lock Brake System (ABS) Module . If there are no "invalid data" or "no communication" Diagnostic Trouble Codes (DTCs) present, GO to E2.

E2 VERIFY AUTOMATIC RELEASE FUNCTIONALITY

With the transmission in PARK, apply the parking brake.

Fasten the driver seat belt.

Close the driver door.

Start the engine.

Select DRIVE.

NOTE: When the accelerator pedal is pressed, the parking brake releases automatically.

Press the accelerator pedal until the parking brake releases and the vehicle begins to move.

Does the parking brake automatically release when the accelerator pedal is pressed?

Yes	The system is operating correctly at this time. The concern may have been due to the automatic release functional requirements not being met. EXPLAIN the automatic release functional requirements to the customer. REFER to: Parking Brake - System Operation and Component Description .

GO to E3

E3 CHECK THE BCM (BODY CONTROL MODULE) AND PCM (POWERTRAIN CONTROL MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)

Select PARK.

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, carry out the BCM self-test.

Retrieve and record all BCM Diagnostic Trouble Codes (DTCs).

Using a diagnostic scan tool, carry out the PCM KOEO self-test.

Retrieve and record all PCM Diagnostic Trouble Codes (DTCs).

Are any Diagnostic Trouble Codes (DTCs) present in the BCM or PCM?

Yes	For BCM Diagnostic Trouble Codes (DTCs), REFER to: Body Control Module (BCM) MULTIFUNCTION ELECTRONIC MODULES . For PCM Diagnostic Trouble Codes (DTCs), REFER to: ELECTRONIC ENGINE CONTROLS - 3.5L ECOBOOST (272KW/370PS) .

GO to E4

E4 CHECK THE ACTUATOR MOTOR CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect ABS module C135 .

Disconnect the suspect parking brake actuator motor electrical connector.

For the LH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4478-1	Courtesy of FORD MOTOR COMPANY	C135-12
C4478-2	Courtesy of FORD MOTOR COMPANY	C135-13

For the RH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4479-1	Courtesy of FORD MOTOR COMPANY	C135-3
C4479-2	Courtesy of FORD MOTOR COMPANY	C135-2

Are the resistances less than 3 ohms?

Yes	If DTC C2007:13 or C2008:13 are the only Diagnostic Trouble Codes (DTCs) are present, GO to E8If other Diagnostic Trouble Codes (DTCs) are present, GO to E5

No	INSPECT the actuator motor jumper harness and connectors for correct routing, damaged connectors, spread terminals, bent or pushed-out pins or any signs of corrosion. INSTALL a new jumper harness as necessary. If the jumper harness is OK, REPAIR the circuit.

E5 CHECK THE ACTUATOR MOTOR CIRCUITS FOR A SHORT TO GROUND

For the LH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4478-1	Courtesy of FORD MOTOR COMPANY	Ground
C4478-2	Courtesy of FORD MOTOR COMPANY	Ground

For the RH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4479-1	Courtesy of FORD MOTOR COMPANY	Ground
C4479-2	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to E6

No	REPAIR the circuit.

E6 CHECK THE ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER

For the LH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4478-1	Courtesy of FORD MOTOR COMPANY	C4478-2

For the RH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4479-1	Courtesy of FORD MOTOR COMPANY	C4479-2

Is the resistance greater than 10, 000 ohms?

Yes

GO to E7

No	INSPECT the actuator motor jumper harness and connectors for correct routing, damaged connectors, spread terminals, bent or pushed-out pins or any signs of corrosion. INSTALL a new jumper harness as necessary. If the jumper harness is OK, REPAIR the circuit.

E7 CHECK THE ACTUATOR MOTOR CIRCUITS FOR A SHORT TO VOLTAGE

NOTE: Performing this step sets Diagnostic Trouble Codes (DTCs) in the ABS module.

Ignition ON.

For the LH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4478-1	Courtesy of FORD MOTOR COMPANY	Ground
C4478-2	Courtesy of FORD MOTOR COMPANY	Ground

For the RH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4479-1	Courtesy of FORD MOTOR COMPANY	Ground
C4479-2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to E8

E8 CHECK THE BRAKE CALIPER BALL SCREW DRIVE
- Ignition OFF.
- Remove the suspect actuator motor. REFER to: Parking Brake Actuator Motor .
- Using a torque wrench, turn the ball screw drive on the brake caliper counterclockwise. It should not take more than 5 Nm (44 lb-in) to turn the ball screw drive.
Does the ball screw drive turn with less than 5 Nm (44 lb-in) or turning force?

Yes GO to E9

No INSTALL a new brake caliper. REFER to:BRAKE CALIPER .

E9 CHECK THE ACTUATOR MOTOR RESISTANCE

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Suspect Actuator Motor Electrical Connector Pin-1, Component Side	Courtesy of FORD MOTOR COMPANY	Suspect Actuator Motor Electrical Connector Pin-2, Component Side

Is the resistance less than 500 ohms?

Yes

GO to E10

No	INSTALL a new parking brake actuator motor. REFER to:Parking Brake Actuator Motor .

E10 VERIFY ALL WIRING CONNECTIONS

Ignition OFF.

Using a good light source, inspect ABS module C135 , parking brake actuator motor C4478 or C4479 and all related in-line connectors for the following:
- corrosion - install new connector or terminal and clean the module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary

Are the connectors free of corrosion, damaged pins, bent pins, pushed-out pins and spread terminals?

Yes

GO to E11

No	REPAIR the connector or terminals. Refer to Wiring Diagram Connector Repair Procedures for schematic and connector information.

E11 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

Connect ABS module C135 . Make sure it seats and latches correctly.

Connect the suspect parking brake actuator motor connector. Make sure it seats and latches correctly.

Ignition ON.

Perform the following steps to restore parking brake switch functionality:
- Place the switch in the APPLY position.
- Release the switch to the NEUTRAL position.
- Place the switch in the RELEASE position.
- Release the switch to the NEUTRAL position.
- Repeat the 4 steps.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no Technical Service Bulletins (TSBs) exist for this concern, INSTALL a new ABS module. REFER to: Anti-Lock Brake System (ABS) and Stability Control .

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.