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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 107 (On-Board Diagnostic - Electric Parking Brake) >> DTC C1128-0A; Electric Parking Brake Switch Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Inspection Action
1 INSPECT ELECTRIC PARKING BRAKE SWITCH CONNECTOR CONDITION Yes Go to the next step.
No Repair or replace the connector, then go to Ste p 6.
2 INSPECT ELECTRIC PARKING BRAKE SWITCH Yes Go to the next step.
No Replace the electric parking brake switch, then go to Step 6.
(See ELECTRIC PARKING BRAKE SWITCH REMOVAL/INSTALLATION .)
3 VERIFY ELECTRIC PARKING BRAKE SWITCH POWER SUPPLY VOLTAGE 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.

Go to Step 6.
4 INSPECT ELECTRIC PARKING BRAKE CONTROL MODULE CONNECTOR CONDITION Yes Go to the next step.
No Repair or replace the connector, then go to Ste p 6.
5 INSPECT ELECTRIC PARKING BRAKE SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY Yes Go to the next step.
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 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.

Go to the next step.
6 VERIFY THAT REPAIRS HAVE BEEN COMPLETED
Is the same DTC displayed?		 Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
7 VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?
 Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [ELECTRIC PARKING BRAKE] .)
No DTC troubleshooting completed.
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