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Home >> Mazda >> 2023 >> CX-5 Turbo >> Repair and Diagnosis >> Brakes >> Parking Brake System >> On-Board Diagnostic - Electric Parking Brake >> DTC U300A-62: Ignition Switch Status Mismatch [Electric Parking Brake Control Module] >> Diagnostic Procedure

Diagnostic Procedure

DTC U300A:62 (ELECTRIC PARKING BRAKE CONTROL MODULE) DIAGNOSTIC PROCEDURE

Step Inspection Results Action
1 VERIFY ALL SYSTEM DTCs  Yes If a procedure which verifies other DTCs is included in the diagnostic procedure of the displayed DTC: 
  • Go to the next step.

If a procedure which verifies other DTCs is not included in the diagnostic procedure of the displayed DTC: 
No Go to the next step.
2 INSPECT ELECTRIC PARKING BRAKE CONTROL MODULE CONNECTOR CONDITION 
  • Switch the ignition off.
  • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • 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, then go to Step 4.
3 VERIFY ELECTRIC PARKING BRAKE CONTROL MODULE POWER SUPPLY (IG1) VOLTAGE 
  • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Switch the ignition ON (engine off or on).
  • Measure the voltage at the electric parking brake control module terminal 1AB (wiring harness-side).
  • Is the voltage B+?
 Yes Go to the next step.
No Inspect the C/U IG1 15 A fuse.
  • If the fuse is blown:
    • Refer to the wiring diagram and verify whether or not there is a common connector between IG1 relay terminal C and electric parking brake control module terminal 1AB.

    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 IG1 relay terminal C and electric parking brake control module terminal 1AB.

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 the next step.
4 VERIFY THAT REPAIRS HAVE BEEN COMPLETED  Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
5 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 CONTROL MODULE] .)
No DTC troubleshooting completed.
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