Pinpoint Test E: The Parking Brake Does Not Hold The Vehicle, Does Not Apply, Does Not Release Using The Parking Brake 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 "lost communication" or "invalid data" Diagnostic Trouble Codes (DTCs) present in the ABS module?
- Yes
: DIAGNOSE the communication concern.
REFER to: ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL .
- No
: If DTC
C2005:1B, C2005:71, C2006:1B, C2006:71, C2007:13, C2007:1C, C2007:92, C2008:13, C2008:1C or C2008:92 is present, GO to E2
For all other Diagnostic Trouble Codes (DTCs), GO to the DTC CHART: ANTI-LOCK BRAKE SYSTEM (ABS) MODULE .
- E2 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 C3529-1 C135-12 C3529-2 C135-13 - For the RH
actuator motor, measure:
Positive Lead Measurement/Action Negative Lead C3551-1 C135-3 C3551-2 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 E6
If other Diagnostic Trouble Codes (DTCs) are present, GO to E3
- 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.
- E3 CHECK THE ACTUATOR MOTOR CIRCUITS FOR A SHORT TO GROUND
- For the LH
actuator motor, measure:
Positive Lead Measurement/Action Negative Lead C3529-1 Ground C3529-2 Ground - For the RH
actuator motor, measure:
Positive Lead Measurement/Action Negative Lead C3551-1 Ground C3551-2 Ground
Are the resistances greater than 10, 000 ohms?
- Yes : GO to E4
- 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.
- For the LH
actuator motor, measure:
- E4 CHECK THE ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER
- For the LH
actuator motor, measure:
Positive Lead Measurement/Action Negative Lead C3529-1 C3529-2 - For the RH
actuator motor, measure:
Positive Lead Measurement/Action Negative Lead C3551-1 C3551-2
Is the resistance greater than 10, 000 ohms?
- Yes : 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.
- For the LH
actuator motor, measure:
- E5 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 C3529-1 Ground C3529-2 Ground - For the RH
actuator motor, measure:
Positive Lead Measurement/Action Negative Lead C3551-1 Ground C3551-2 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.
- No : GO to E6
- E6 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 E7
- No
: INSTALL a new brake caliper.
REFER to: BRAKE CALIPER .
- E7 CHECK THE ACTUATOR MOTOR RESISTANCE
- Ignition OFF.
- Measure:
Positive Lead Measurement/Action Negative Lead Suspect Actuator Motor Electrical Connector Pin-1, Component Side Suspect Actuator Motor Electrical Connector Pin-2, Component Side
Is the resistance less than 500 ohms?
- Yes : GO to E8
- No
: INSTALL a new parking brake actuator motor.
REFER to: PARKING BRAKE ACTUATOR MOTOR .
- E8 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION
- Inspect ABS module C135 .
- Repair:
corrosion (install new connector or terminal - clean module pins)
damaged or bent pins - install new terminals or pins
pushed-out pins - install new pins as necessary
- Connect ABS module C135 . Make sure it seats and latches correctly.
- Connect the suspect parking brake actuator motor electrical connector. Make sure it seats and latches correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
- Yes
: CHECK OASIS
for any applicable Technical Service Bulletins (TSBs). If a TSB
exists for this concern, DISCONTINUE this test and FOLLOW the TSB
instructions.
If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new ABS module and HCU assembly.
REFER to: HYDRAULIC CONTROL UNIT (HCU) .
- 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.