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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> On-Board Diagnostic - Start Stop Unit >> DTC C0040-24; Brake Switch (No. 1 Signal) Circuit Malfunction >> Notes

DTC C0040-24; Brake Switch (No. 1 Signal) Circuit Malfunction: Notes

DTC C0040-24; BRAKE SWITCH (NO. 1 SIGNAL) CIRCUIT MALFUNCTION DETECTION CONDITION AND POSSIBLE CAUSES

Description Brake switch (No. 1 signal) circuit malfunction
Detection condition
  • The start stop unit detected the following condition 5 times continuously with the ignition switched ON (engine off or on).
    • The brake switch (No. 1 signal) is ON for a continuous 3 s or more even though the brake switch (No. 2 signal) changes.
Fail-safe
  • Determined by brake switch (No. 2 signal) with the brake pedal depressed.
Possible cause
  • Brake switch connector or terminal malfunction
  • Brake switch (No. 1 signal) malfunction
  • Start stop unit connector or terminal malfunction
  • Short to power supply in wiring harness between brake switch terminal D and start stop unit terminal 1C
  • Start stop unit malfunction
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