Determination Procedure

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.

CAUTION:

When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.
When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.
Disconnect the negative battery cable before performing any work that requires handling of connectors.

DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No. 6, US) - DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	INSPECT CAN LINE BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTOR C-10 FOR SHORT TO POWER SUPPLY Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .) Disconnect the connector C-10. Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .) Switch the ignition ON (engine off). Measure the voltage at body control module (BCM) terminals 2A and 2C. Is the voltage between 1.5-3.5 V?	Yes	Go to Step 3.
1		No	Go to the next step.
2	INSPECT BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .) Disconnect the connector 2 which has body control module (BCM) terminals 2A and 2C. Connect the connector C-10. Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .) Switch the ignition ON (engine off). Measure the voltage at body control module (BCM) terminals 2A and 2C (wiring harness side). Is the voltage between 1.5-3.5 V?	Yes	Replace the body control module (BCM) because there is a short to the power supply in the body control module (BCM). (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION (US) .)
2		No	Repair or replace the wiring harness between the body control module (BCM) and connector C-10 because the wiring harness is shorted to the power supply.
3	INSPECT CAN LINE BETWEEN REAR SIDE RADAR SENSOR (LH) AND CONNECTOR C-10 FOR SHORT TO POWER SUPPLY Measure the voltage at rear side radar sensor (LH) terminals C and D. Is the voltage between 1.5-3.5 V?	Yes	Go to Step 5.
3		No	Go to the next step.
4	INSPECT REAR SIDE RADAR SENSOR (LH) FOR SHORT TO POWER SUPPLY Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .) Connect the connector C-10. Disconnect the rear side radar sensor (LH) connector. Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .) Switch the ignition ON (engine off). Measure the voltage at body control module (BCM) terminals 2A and 2C. Is the voltage between 1.5-3.5 V?	Yes	Replace the rear side radar sensor (LH) because there is a short to the power supply in the rear side radar sensor (LH). (See REAR SIDE RADAR SENSOR REMOVAL/INSTALLATION .)
4		No	Repair or replace the wiring harness between the rear side radar sensor (LH) and connector C-10 because the wiring harness is shorted to the power supply.
5	INSPECT CAN LINE BETWEEN FRONT RADAR SENSOR AND CONNECTOR C-10 FOR SHORT TO POWER SUPPLY Measure the voltage at front radar sensor terminals E and C. Is the voltage between 1.5-3.5 V?	Yes	Go to Step 7.
5		No	Go to the next step.
6	INSPECT FRONT RADAR SENSOR FOR SHORT TO POWER SUPPLY Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .) Connect the connector C-10. Disconnect the front radar sensor connector. Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .) Switch the ignition ON (engine off). Measure the voltage at body control module (BCM) terminals 2A and 2C. Is the voltage between 1.5-3.5 V?	Yes	Replace the front radar sensor because there is a short to the power supply in the front radar sensor. (See FRONT RADAR SENSOR REMOVAL/INSTALLATION .)
6		No	Repair or replace the wiring harness between the front radar sensor and connector C-10 because the wiring harness is shorted to the power supply.
7	INSPECT CAN LINE BETWEEN CONNECTOR C-10 AND CONNECTOR C-06 FOR SHORT TO POWER SUPPLY Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .) Disconnect the connector C-06. Connect the connector C-10. Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .) Switch the ignition ON (engine off). Measure the voltage at body control module (BCM) terminals 2A and 2C. Is the voltage between 1.5-3.5 V?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness between the connector C-10 and connector C-06 because the wiring harness is shorted to the power supply.
8	INSPECT CAN LINE BETWEEN CONNECTOR C-06 AND BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .) Disconnect the connector 4 which has body control module (BCM) terminals 4N and 4M. Connect the connector C-06. Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .) Switch the ignition ON (engine off). Measure the voltage at body control module (BCM) terminals 2A and 2C. Is the voltage between 1.5-3.5 V?	Yes	Replace the body control module (BCM) because there is a short to the power supply in the body control module (BCM). (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION (US) .)
8		No	Repair or replace the wiring harness between the connector C-06 and body control module (BCM) because the wiring harness is shorted to the power supply.