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Inspection For Short To Ground And Open Circuit In Power Supply Circuit

  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  2. Disconnect the connector on the part side of the circuit to be inspected.
    G15743886Courtesy of MAZDA MOTORS CORP.
    NOTE:
    • For the connector disconnection procedure, refer to the removal/installation procedure for each part.
  3. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  4. Switch the ignition ACC (for ACC power supply circuit) or ON (engine off or on) (for IG1 power supply circuit).
  5. Measure the voltage at the applicable part-side connector terminal.
    G15743887Courtesy of MAZDA MOTORS CORP.

    If voltage is B+: 

    • There is no short to ground in the circuit or an open circuit, therefore the inspection is completed.

    If voltage is less than B+: 

    • To specify the malfunctioning location, go to the next step.
  6. Inspect the fuse.

    If the fuse is blown (short to ground): 

    • Refer to the wiring diagram and verify if there is a common connector between the applicable circuits.

    If there is a common connector: 

    • Switch the ignition off.
    • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
    • Disconnect the common connector and inspect the connector and terminal. (See CONNECTOR INSPECTION .)
      G15743888Courtesy of MAZDA MOTORS CORP.
    • Inspect each common connector for continuity between the applicable terminal and body ground to determine the malfunctioning location.
      • Repair or replace the vehicle wiring harness which is shorted to ground.
      • Replace the blown fuse.

    If there is no common connector: 

    • Repair or replace the vehicle wiring harness.
    • Replace the blown fuse.

    If the fuse is damaged: 

    • Replace the damaged fuse.

    If the fuse is normal (open circuit): 

    • Refer to the wiring diagram and verify if there is a common connector between the applicable circuits.

    If there is a common connector: 

    • Switch the ignition off.
    • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
    • Disconnect the common connector and inspect the connector and terminal. (See CONNECTOR INSPECTION .)
      G15743889Courtesy of MAZDA MOTORS CORP.
    • Inspect each common connector for continuity between the applicable terminals to determine the malfunctioning location.
      • Repair or replace the vehicle wiring harness which has an open circuit.

    If there is no common connector: 

    • Repair or replace the vehicle wiring harness.
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