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

Refer to VEHICLE DYNAMIC SYSTEMS for schematic and connector information.

Normal Operation and Fault Conditions

When the ABS module receives a parking brake apply or release request, the ABS module sends voltage to the parking brake actuator motors. The ABS module also monitors the current draw of the actuator motors to determine when the brake pads contact the brake disc, to determine when the appropriate amount of clamping force is being applied to the brake disc and to determine when the brake pads are retracted to their start position. A HS-CAN issue or concern results in a failure to release the parking brake. The ABS module runs self-tests before, during and after an apply or release request. These self-tests are done to determine parking brake system functionality. High actuator motor circuit resistance, a short to ground, a short to voltage, an open circuit, a mechanical or electrical failure of the actuator motor or an internal failure of the ABS module may cause one or more of these self-tests to fail resulting in the ABS module setting one or more Diagnostic Trouble Codes (DTCs). The actuator motors have a serviceable jumper harness connecting the actuator motor to the body harness at C334 for the LH actuator motor and C316 for the RH actuator motor.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
ABS C1034:97	Park Brake: Component Or System Operation Obstructed Or Blocked	This DTC will be set if the park brake switch is in Release or Apply for longer than a set amount of time continuously while vehicle is at a standstill.
ABS C1A43:98	Motor Supply: Component Or System Over Temperature	This DTC sets when the temperature of the ABS module Field Effect Transistor reaches a preset limit.
ABS C2005:1B	Right Actuator: Circuit Resistance Above Threshold	This DTC sets in continuous memory and on-demand if during an apply (clamping) command, the measured resistance in the motor circuit is higher than a predetermined threshold.
ABS C2006:1B	Left Actuator: Circuit Resistance Above Threshold	This DTC sets in continuous memory and on-demand if during an apply (clamping) command, the measured resistance in the motor circuit is higher than a predetermined threshold.
ABS C2005:71	Right Actuator: Actuator Stuck	This DTC sets in continuous memory and on-demand if during an apply or release command, the ABS module detects no movement of the actuator motor.
ABS C2006:71	Left Actuator: Actuator Stuck	This DTC sets in continuous memory and on-demand if during an apply or release command, the ABS module detects no movement of the actuator motor.
ABS C2007:13	Right Motor: Circuit Open	This DTC sets in continuous memory and on-demand if the ABS module detects a difference in the current between the positive side and the negative side of the actuator motor.
ABS C2008:13	Left Motor: Circuit Open	This DTC sets in continuous memory and on-demand if the ABS module detects a difference in the current between the positive side and the negative side of the actuator motor.
ABS C2007:1C	Right Motor: Circuit Voltage Out Of Range	This DTC sets in continuous memory and on-demand if the ABS module detects a short to ground or a short to voltage on the actuator motor circuits.
ABS C2008:1C	Left Motor: Circuit Voltage Out Of Range	This DTC sets in continuous memory and on-demand if the ABS module detects a short to ground or a short to voltage on the actuator motor circuits.
ABS C2007:92	Right Motor: Performance Or Incorrect Operation	This DTC sets in continuous memory and on-demand if the ABS module detects a current greater than 23 amps after an apply or release request, detects a mismatch in motor control (power instead of ground or ground instead of power), or detects a power loss that exceeds a predetermined threshold during an apply or release function.
ABS C2008:92	Left Motor: Performance Or Incorrect Operation	This DTC sets in continuous memory and on-demand if the ABS module detects a current greater than 23 amps after an apply or release request, detects a mismatch in motor control (power instead of ground or ground instead of power), or detects a power loss that exceeds a predetermined threshold during an apply or release function.
HVAC B1541:11	Auto Hold LED: Circuit Short To Ground	This DTC sets in continuous memory and on-demand if the HVAC module detects a short to ground. The Autohold indicator will not be illuminated and the Autohold button function is deactivated.
HVAC B1541:15	Auto Hold LED: Circuit Short To Battery Or Open	This DTC sets in continuous memory and on-demand if the HVAC module detects a short to ground. The Autohold indicator will always be illuminated and the Autohold button function is deactivated.

Possible Sources

Automatic release functional requirements not met
BCM concern
PCM concern
Wiring, terminals or connectors
Brake caliper
Parking brake actuator motor
ABS module
EPB switch

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 E9

No	If there are any "invalid data" or "no communication" Diagnostic Trouble Codes (DTCs) present, GO to the DTC Chart: 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 - Overview .

GO to E3

E3 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) MODULE FOR DIAGNOSTIC TROUBLE CODES (DTCS)
- Select PARK.
- Ignition OFF.
- Ignition ON.
- Using a diagnostic scan tool, carry out the HVAC Module self-test.
- Retrieve and record all HVAC Module Diagnostic Trouble Codes (DTCs).
Are Diagnostic Trouble Codes (DTCs) B1541:11 or B1541:15 present?

Yes GO to E4

No GO to E9

E4 CHECK THE PARKING BRAKE SWITCH AUTOHOLD IN THE APPLIED AND UNAPPLIED POSITIONS

Ignition OFF.

Disconnect EPB switch C3675.

Push Autohold button ON and OFF.

Measure:

Auto Hold Switch

Positive Lead	Measurement / Action	Negative Lead
C3675-11 Component side	Courtesy of FORD MOTOR COMPANY	C3675-2 Component side

Auto Hold Indicator

Positive Lead	Measurement / Action	Negative Lead
C3675-5 Component side	Courtesy of FORD MOTOR COMPANY	C3675-2 Component side

Are the resistances less than 3 ohms?

Yes

GO to E5

No	Replace the EPB switch. REFER to: Parking Brake Switch .

E5 CHECK THE PARKING BRAKE SWITCH GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3675-2	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to E6

No	REPAIR the circuit.

E6 CHECK THE PARKING BRAKE SWITCH AUTOHOLD CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect the HVAC module C228A.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C228A-6	Courtesy of FORD MOTOR COMPANY	C3675-5
C228A-5	Courtesy of FORD MOTOR COMPANY	C3675-11

Are the resistances less than 3 ohms?

Yes

GO to E7

No	REPAIR the effected circuit.

E7 CHECK THE PARKING BRAKE SWITCH AUTOHOLD CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C228A-6	Courtesy of FORD MOTOR COMPANY	Ground
C228A-5	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to E8

No	REPAIR the effected circuit.

E8 CHECK THE PARKING BRAKE SWITCH AUTOHOLD CIRCUITS FOR A SHORT TO BATTERY VOLTAGE

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C228A-6	Courtesy of FORD MOTOR COMPANY	Ground
C228A-5	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present

Yes	REPAIR the effected circuit.

GO to E17

E9 CHECK THE ACTUATOR MOTOR CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect ABS module C155.

Disconnect the suspect parking brake actuator motor electrical connector.

For the RH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4479-1	Courtesy of FORD MOTOR COMPANY	C155-12
C4479-2	Courtesy of FORD MOTOR COMPANY	C155-13

For the LH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4478-1	Courtesy of FORD MOTOR COMPANY	C155-3
C4478-2	Courtesy of FORD MOTOR COMPANY	C155-2

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 E13 If other Diagnostic Trouble Codes (DTCs) are present, GO to E10

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.

E10 CHECK THE ACTUATOR MOTOR CIRCUITS FOR A SHORT TO 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

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

Are the resistances greater than 10, 000 ohms?

Yes

GO to E11

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.

E11 CHECK THE ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER

For the RH actuator motor, measure:

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

For the LH actuator motor, measure:

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

Is the resistance greater than 10, 000 ohms?

Yes

GO to E12

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.

E12 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 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

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

Is any voltage present?

Yes	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.

GO to E13

E13 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 E14

No INSTALL a new brake caliper. REFER to: Brake Caliper .

E14 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 E15

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

E15 VERIFY ALL WIRING CONNECTIONS
- Ignition OFF.
- Disconnect ABS module and the suspect parking brake actuator motor.
- Using a good light source, inspect ABS module C155, parking brake actuator motor C4478 or C4479 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 E16

No REPAIR the connector or terminals. Refer to OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

E16 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

Connect ABS module C155. 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) Module - Vehicles With: Vacuum Brake Booster .

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.

E17 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) MODULE OPERATION

Connect HVAC module C228A. Make sure it seats and latches correctly.

Connect EPB switch C3675. Make sure it seats and latches correctly.

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.

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 HVAC module. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module .

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.