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DSC HU/Cm Inspection

  1. Disconnect the DSC HU/CM connector. (See DSC HU/CM REMOVAL/INSTALLATION .)
  2. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  3. Attach the tester lead to the DSC HU/CM wiring harness-side connector and inspect voltage, continuity, or resistance according to the standard (reference) on the table.

    Standard (Reference)

    Fig 1: Locating DSC HU/CM Connector Terminals
    G09075247Courtesy of MAZDA MOTORS CORP.
    Terminal Signal name Connected to Measured item Measured terminal (measurement condition) Standard Inspection item(s)
    A Power supply
    (solenoid operation)    		 Battery Voltage Under any condition B+
    • Wiring harness (A-battery)
    B Power supply
    (motor operation)    		 Battery Voltage Under any condition B+
    • Wiring

      harness (B-battery)
    F RF wheel-speed (-) RF ABS wheel-speed sensor Continuity C-RF ABS wheel-speed sensor terminal A Continuity detected
    • Wiring harness (C-RF ABS wheel-speed sensor terminal A)
    D - - - - - -
    E - - - - - -
    F RF wheel-speed (+) RF ABS wheel-speed sensor Continuity F-RF ABS wheel-speed sensor terminal) Continuity detected
    • Wiring harness (F-RF ABS wheel-speed sensor terminal B)
    G - - - - - -
    H - - - - - -
    I - - - - - -
    J - - - - - -
    K - - - - - -
    L LR wheel-speed (+) LR ABS wheel-speed sensor Continuity L-LR ABS wheel-speed sensor terminal A(1)/B(2) Continuity detected
    • Wiring harness (L-LR ABS wheel-speed sensor terminal A(1)/B(2))
    M - - - - - -
    N - - - - - -
    O LR wheel-speed (-) LR wheel-speed sensor Continuity O-LR ABS wheel-speed sensor terminal B(1)/D(2) Continuity detected
    • Wiring harness (O-LR ABS wheel-speed sensor terminal B(1)/D(2))
    P - - - - - -
    Q Power supply (system) IG1 relay Voltage Ignition switched ON (engine off). B+
    • Wiring harness (Q-IG1 relay)
    Switch the ignition to off. 1V or less
    R - - - - - -
    S - - - - - -
    T - - - - - -
    U - - - - - -
    V - - - - - -
    W - - - - - -
    X RR wheel-speed (-) RR ABS wheel-speed sensor Continuity X-RR ABS wheel-speed sensor terminal B(1)/D(2) Continuity detected
    • Wiring harness (X-RR ABS wheel-speed sensor terminal B(1)/D(2))
    Y - - - - - -
    Z - - - - - -
    AA RR wheel-speed (+) RR ABS wheel-speed sensor Continuity AA-RR ABS wheel-speed sensor terminal)(1)/B(2) Continuity detected
    • Wiring harness (AA-RR ABS wheel-speed sensor terminal A(1)/B(2))
    AB - - - - - -
    AC CAN_L CAN module This terminal is used for communication and cannot be used for malfunction determination during terminal voltage inspection. Perform a DTC inspection.
    AD - - - - - -
    AE - - - - - -
    AF CAN_H CAN module This terminal is used for communication and cannot be used for malfunction determination during terminal voltage inspection. Perform a DTC inspection.
    AG LF wheel-speed sensor(+) LF ABS wheel-speed sensor Continuity AG-LF ABS wheel-speed sensor terminal B Continuity detected
    • Wiring harness (AG-LF ABS wheel-speed sensor terminal B)
    AH - - - - - -
    AI Brake light Brake light relay Voltage Brake pedal depressed B+
    • Wiring harness (AI - Brake light relay terminal D)
    Brake pedal released 1V or less
    AJ LF wheel-speed sensor(-) LF wheel-speed sensor Continuity AJ - LF ABS wheel-speed sensor terminal A Continuity detected
    • Wiring harness (AJ - LF ABS wheel-speed sensor terminal A)
    AK - - - - - -
    AL Ground Ground point Continuity AL-ground point Continuity detected
    • Wiring harness (AL-ground point)
    (1) 1 :Without electric parking brake
    (2) 2 :With electric parking brake
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