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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> Brakes >> Parking Brake System >> Symptom Troubleshooting - Electric Parking Brake >> Electric Parking Brake Switch Indicator Light Is On Or Off Constantly [Electric Parking Brake] >> Diagnostic Procedure

Diagnostic Procedure

ELECTRIC PARKING BRAKE SWITCH INDICATOR LIGHT ON OR OFF CONSTANTLY 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 terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • 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
  • Verify that the electric parking brake switch connector is disconnected.
  • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Measure the voltage at the electric parking brake switch terminal K (wiring harness-side).
  • Is the voltage B+?
 Yes Go to the next step.
No Inspect the AT 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 terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Disconnect the electric parking brake conterol 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 conterol 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 conterol module terminal 1R.
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 conterol module connectors are disconnected.
  • Inspect the wiring harness for continuity between electric parking brake switch terminal L (wiring harness-side) and electric parking brake conterol module terminal 1R (wiring harness-side).
  • Is there continuity?
 Yes Replace the electric parking brake control module.
(See ELECTRIC PARKING BRAKE CONTROL MODULE REMOVAL/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 conterol module terminal 1R.
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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