ELECTRIC PARKING BRAKE AUTOMATIC RELEASE FUNCTION DURING ACCELERATION MALFUNCTIONS [ELECTRIC PARKING BRAKE]

id040328250600

Note
•  If there is any vehicle malfunction complaint lodged by a customer, perform FOREWORD [ELECTRIC PARKING BRAKE] malfunction diagnosis according to the troubleshooting procedure. (See FOREWORD [ELECTRIC PARKING BRAKE].)

Description

•  Electric parking brake automatic release function during acceleration malfunctions no matter any of the following conditions.
?  Door open/closed condition
•  The front door (driver’s side) is open.
?  Seat belt fastened
•  The driver's side seat belt is unfastened.
?  Selector lever position
•  The selector lever is in the P or N position.
?  Accelerator pedal depression condition
•  The accelerator pedal is not depressed.

Possible Cause

•  Electric parking brake control module malfunction
•  Front door latch and lock actuator (driver’s side) connector or terminal malfunction
•  Front door latch switch (driver’s side) malfunction
•  Open circuit in wiring harness between the following terminals:
?  L.H.D.
•  Front door latch and lock actuator (LH) terminal J —Body ground
?  R.H.D.
•  Front door latch and lock actuator (RH) terminal D—Body ground
•  Rear body control module (RBCM) connector or terminal malfunction
•  Short to power supply in wiring harness between the following terminals:
?  L.H.D.
•  Front door latch and lock actuator (LH) terminal L—Rear body control module (RBCM) terminal 3W
?  R.H.D.
•  Front door latch and lock actuator (RH) terminal B—Rear body control module (RBCM) terminal 3W
•  Rear body control module (RBCM) malfunction
•  Open circuit in wiring harness between the following terminals:
?  L.H.D.
•  Front door latch and lock actuator (LH) terminal L—Rear body control module (RBCM) terminal 3W
?  R.H.D.
•  Front door latch and lock actuator (RH) terminal B—Rear body control module (RBCM) terminal 3W
•  Driver-side buckle switch connector or terminal malfunction
•  Driver-side buckle switch malfunction
•  Open circuit in wiring harness between driver-side buckle switch terminal 5A and body ground
•  SAS control module connector or terminal malfunction
•  Short to power supply in wiring harness between driver-side buckle switch terminal 5B and SAS control module terminal 2N
•  SAS control module malfunction
•  Open circuit in wiring harness between driver-side buckle switch terminal 5B and SAS control module terminal 2N

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action
1
VERIFY ALL SYSTEM DTCs
•  Switch the ignition OFF.
•  Switch the ignition ON (engine off or on) and wait for 10 s or more.
•  Perform a CMDTC self-test using the M-MDS.
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [ELECTRIC PARKING BRAKE].)
No
Go to the next step.
2
VERIFY IF THE ELECTRIC PARKING BRAKE WARNING LIGHT IS TURNED ON
•  Verify if the electric parking brake warning light is turned on.
•  Is the electric parking brake warning light turned on?
Yes
Perform an inspection referring to “ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON”.
(See ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON [ELECTRIC PARKING BRAKE].)
No
Go to the next step.
3
DETERMINE MALFUNCTIONING LOCATION BY PERFORMING PID/DATA MONITOR INSPECTION
•  Using the M-MDS, display the following PIDs for the rear body control module (RBCM).
?  DOOR_D (Front door (driver’s side) open/closed condition)
•  Using the M-MDS, display the following PIDs for the SAS control module.
?  SEET_B_D (Driver's seat belt fastened)
•  Does the PID monitoring value switch correctly in conjunction with the opening/closing of the front door (driver’s side) or with the driver's seat belt fastened?
Yes
Replace the electric parking brake control module.
(See ELECTRIC PARKING BRAKE CONTROL MODULE REMOVAL/INSTALLATION.)
No
Not in conjunction with front door (driver’s side) open/close
•  Go to the next step.
Not in conjunction with driver's seat belt fastened
•  Go to Step 10.
4
INSPECT FRONT DOOR LATCH AND LOCK ACTUATOR (DRIVER’S SIDE) CONNECTOR CONDITION
•  Switch the ignition OFF.
•  Disconnect the negative battery terminal.
•  Disconnect the front door latch and lock actuator (driver’s side) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector.
5
INSPECT FRONT DOOR LATCH SWITCH (DRIVER’S SIDE)
•  Inspect the front door latch switch (driver’s side).
•  Is the front door latch switch (driver’s side) normal?
Yes
Go to the next step.
No
Replace the front door latch and lock actuator (driver’s side).
(See FRONT DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
6
INSPECT FRONT DOOR LATCH SWITCH (DRIVER’S SIDE) GROUND CIRCUIT FOR OPEN CIRCUIT
•  Verify that the front door latch and lock actuator (driver's side) connector is disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
?  L.H.D.
•  Front door latch and lock actuator (LH) terminal J—Body ground
?  R.H.D.
•  Front door latch and lock actuator (RH) terminal D—Body ground
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  L.H.D.
?  Front door latch and lock actuator (LH) terminal J—Body ground
•  R.H.D.
?  Front door latch and lock actuator (RH) terminal D—Body ground
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit and a poor ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit and a poor ground.
7
INSPECT REAR BODY CONTROL MODULE (RBCM) CONNECTOR CONDITION
•  Disconnect the rear body control module (RBCM) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector.
8
INSPECT FRONT DOOR LATCH SWITCH (DRIVER’S SIDE) CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the front door latch and lock actuator (driver’s side) and rear body control module (RBCM) connectors are disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminal (wiring harness-side):
?  L.H.D.
•  Front door latch and lock actuator (LH) terminal L
?  R.H.D.
•  Front door latch and lock actuator (RH) terminal B
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  L.H.D.
?  Front door latch and lock actuator (LH) terminal L—Rear body control module (RBCM) terminal 3W
•  R.H.D.
?  Front door latch and lock actuator (RH) terminal B—Rear body control module (RBCM) terminal 3W
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to power supply.
9
INSPECT FRONT DOOR LATCH SWITCH (DRIVER’S SIDE) CIRCUIT FOR OPEN CIRCUIT
•  Switch the ignition OFF.
•  Disconnect the negative battery terminal.
•  Verify that the front door latch and lock actuator (driver’s side) and rear body control module (RBCM) connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
?  L.H.D.
•  Front door latch and lock actuator (LH) terminal L—Rear body control module (RBCM) terminal 3W
?  R.H.D.
•  Front door latch and lock actuator (RH) terminal B—Rear body control module (RBCM) terminal 3W
•  Is there continuity?
Yes
Replace the rear body control module (RBCM).
(See REAR BODY CONTROL MODULE (RBCM) REMOVAL/INSTALLATION.)
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  L.H.D.
?  Front door latch and lock actuator (LH) terminal L—Rear body control module (RBCM) terminal 3W
•  R.H.D.
?  Front door latch and lock actuator (RH) terminal B—Rear body control module (RBCM) terminal 3W
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
10
INSPECT DRIVER-SIDE BUCKLE SWITCH CONNECTOR CONDITION
•  Switch the ignition OFF.
•  Disconnect the negative battery terminal and wait for 1 min or more.
•  Disconnect the driver-side buckle switch connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector.
11
INSPECT DRIVER-SIDE BUCKLE SWITCH
•  Inspect the driver-side buckle switch.
•  Is the driver-side buckle switch normal?
Yes
Go to the next step.
No
Replace the driver-side front buckle.
(See FRONT BUCKLE REMOVAL/INSTALLATION.)
12
INSPECT DRIVER-SIDE BUCKLE SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT
•  Verify that the driver-side buckle switch connector is disconnected.
•  Inspect the wiring harness for continuity between driver-side buckle switch terminal 5A (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between driver-side buckle switch terminal 5A and body ground.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
13
INSPECT SAS CONTROL MODULE CONNECTOR CONDITION
•  Disconnect the SAS control module connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector.
14
INSPECT DRIVER-SIDE BUCKLE SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the driver-side buckle switch and SAS control module connectors are disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the driver-side buckle switch terminal 5B (wiring harness-side).
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between driver-side buckle switch terminal 5B and SAS control module terminal 2N.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to power supply.
15
INSPECT DRIVER-SIDE BUCKLE SWITCH CIRCUIT FOR OPEN CIRCUIT
•  Switch the ignition OFF.
•  Disconnect the negative battery terminal.
•  Verify that the driver-side buckle switch and SAS control module connectors are disconnected.
•  Inspect the wiring harness for continuity between driver-side buckle switch terminal 5B (wiring harness-side) and SAS control module terminal 2N (wiring harness-side).
•  Is there continuity?
Yes
Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
No
Refer to the wiring diagram and verify whether or not there is a common connector between driver-side buckle switch terminal 5B and SAS control module terminal 2N.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.