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Home >> Mazda >> 2016 >> 6 Touring, Standard Trans >> Repair and Diagnosis (Single Page) >> Brakes >> Parking Brake System >> Symptom Troubleshooting [Electric Parking Brake] >> Electric Parking Brake Switch Indicator Light Is On Or Off Constantly >> Diagnostic Procedure

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.

    (See DTC INSPECTION [ELECTRIC PARKING BRAKE] .)

  • 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 INSPECT ELECTRIC PARKING BRAKE SWITCH CONNECTOR CONDITION 
  • Switch the ignition off.
  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5] .)

  • Disconnect the electric parking brake 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.
4 VERIFY ELECTRIC PARKING BRAKE CONTROL MODULE POWER SUPPLY VOLTAGE 
 Yes Go to the next step.
No Inspect the ROOM 15 A fuse and MAIN 200 A fuse.
  • If the fuse is blown:
    • Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and electric parking brake switch terminal K.

      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 ground.
      • Repair or replace the malfunctioning part.

      If there is no common connector: 

      • Repair or replace the wiring harness which has a short to ground.
      • Replace the fuse.
  • If the fuse is damaged:
    • Replace the fuse.
  • If the fuse is normal:
    • Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and electric parking brake switch terminal K.

      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.
5 INSPECT ELECTRIC PARKING BRAKE SWITCH 
 Yes Go to the next step.
No Replace the electric parking brake switch.
(See ELECTRIC PARKING BRAKE SWITCH REMOVAL/INSTALLATION .)
6 INSPECT ELECTRIC PARKING BRAKE CONTEROL MODULE CONNECTOR CONDITION 
  • Switch the ignition off.
  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5] .)

  • Disconnect the electric parking brake 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.
7 INSPECT ELECTRIC PARKING BRAKE SWITCH CIRCUIT FOR SHORT TO GROUND 
  • Verify that the electric parking brake switch and electric parking brake control module connectors are disconnected.
  • Inspect for continuity between electric parking brake switch terminal L (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Refer to the wiring diagram and verify whether or not there is a common connector between electric parking brake switch terminal L and electric parking brake control module terminal O.
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 ground.
  • Repair or replace the malfunctioning part.

If there is no common connector: 
  • Repair or replace the wiring harness which has a short to ground.
No Go to the next step.
8 INSPECT ELECTRIC PARKING BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT 
  • Verify that the electric parking brake switch and electric parking brake control module connectors are disconnected.
  • Inspect the wiring harness for continuity between electric parking brake switch terminal L (wiring harness-side) and electric parking brake control module terminal O (wiring harness-side).
  • Is there continuity?
 Yes Replace the electric parking brake control module.
(See ELECTRIC PARKING BRAKE CONTROL MODULE REMOVAL .)
(See ELECTRIC PARKING BRAKE CONTROL MODULE INSTALLATION .)
No Refer to the wiring diagram and verify whether or not there is a common connector between electric parking brake switch terminal L and electric parking brake control module terminal O.
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.
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