Inspection for Short to Power Supply in Circuit

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
Disconnect the ground plate. (For servicing Mazda M Hybrid related parts)
Disconnect the connector on the module side and the connector on the part side of the circuit to be inspected.

Courtesy of MAZDA MOTORS CORP.
NOTE:
- For the connector disconnection procedure, refer to the removal/installation procedure for each part.
Connect the ground plate. (For servicing Mazda M Hybrid related parts)
Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
Switch the ignition ON (engine off or on).
Measure the voltage at the applicable terminal of the module-side or part-side connector.

Courtesy of MAZDA MOTORS CORP.

If voltage exceeds 0 V:
- To specify the malfunctioning location, go to the next step. If voltage is0 V:
- There is no short to power supply in the circuit, therefore the inspection is completed.

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 (US) .)
Disconnect the ground plate. (For servicing Mazda M Hybrid related parts)

Disconnect the common connector and inspect the connector and terminal. (See CONNECTOR INSPECTION .)

Courtesy of MAZDA MOTORS CORP.

Measure the voltage at each common connector to determine the malfunctioning location.
- Repair or replace the vehicle wiring harness which is shorted to the power supply.

If there is no common connector:

Repair or replace the vehicle wiring harness.