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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> Brakes >> Parking Brake System >> On-Board Diagnostic - Electric Parking Brake >> DTC C1128-4A; Electric Parking Brake Switch Circuit Malfunction >> Notes

DTC C1128-4A; Electric Parking Brake Switch Circuit Malfunction: Notes

DTC C1128-4A; ELECTRIC PARKING BRAKE SWITCH CIRCUIT MALFUNCTION - DETECTION CONDITION & POSSIBLE CAUSE

Description Electric parking brake switch circuit malfunction
Detection condition
  • Electric parking brake control module detects an open circuit in the electric parking brake switch circuit.
Fail-safe
  • The electric parking brake control module operates the electric parking brake under any of the following conditions while the vehicle is stopped.
    • Ignition is switched ON (engine off or on) and selector lever is in P or N position (ATX)
    • Ignition is switched ON (engine off or on) and shift lever is in neutral position (MTX)
    • Ignition is switched ON (engine off or on) and driver's door is open from closed condition
    • Ignition is switched off and brake pedal is depressed
    • Ignition is switched off and driver's door is open
Possible cause
  • Electric parking brake switch connector or terminal malfunction
  • Electric parking brake switch malfunction
  • Electric parking brake control module connector or terminal malfunction
  • Open circuit in wiring harness between the following terminals:
    • Electric parking brake switch terminal C-Electric parking brake control module terminal 2K
    • Electric parking brake switch terminal G-Electric parking brake control module terminal 2L
  • Electric parking brake control module malfunction
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