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Home >> Mazda >> 2021 >> 3 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - HS/Ms - Can >> DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No. 5) (US) >> Determination Procedure

Determination Procedure

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 terminal before performing any work that requires handling of connectors.
DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No. 5) (US) DIAGNOSTIC PROCEDURE

Step Inspection Action
1 INSPECT CAN LINE BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTOR C-06 FOR SHORT TO POWER SUPPLY
Yes Go to Step 3.
No Go to the next step.
2 INSPECT BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY
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 .)
No Repair or replace the wiring harness between the body control module (BCM) and connector C-06 because the wiring harness is shorted to the power supply.
3 INSPECT CAN LINE BETWEEN CONNECTOR C-47 AND CONNECTOR C-06 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Repair or replace the wiring harness between the connector C-47 and connector C-06 because the wiring harness is shorted to the power supply.
4 INSPECT CAN LINE BETWEEN PARKING ASSIST UNIT (OPTICAL)/360° VIEW MONITORING CAMERA UNIT AND CONNECTOR C-47 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at parking assist unit (optical)/360° view monitoring camera unit terminals 1C and 1A.
  • Is the voltage between 1.5-3.5 V?
Yes Go to Step 6.
No Go to the next step.
5 INSPECT PARKING ASSIST UNIT (OPTICAL)/360° VIEW MONITORING CAMERA UNIT FOR SHORT TO POWER SUPPLY
Yes Replace the parking assist unit (optical)/360° view monitoring camera unit because there is a short to the power supply in the parking assist unit (optical)/360° view monitoring camera unit. (See 360°VIEW MONITOR CONTROL MODULE REMOVAL/INSTALLATION (US) .)
(See PARKING ASSIST UNIT (OPTICAL) REMOVAL/INSTALLATION (US) .)
No Repair or replace the wiring harness between the parking assist unit (optical)/360° view monitoring camera unit and connector C-47 because the wiring harness is shorted to the power supply.
6 INSPECT JB No. 1 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Replace the JB No. 1 because there is a short to the power supply in the JB No. 1.
7 INSPECT CAN LINE BETWEEN CONNECTOR C-13 AND CONNECTOR C-46 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Repair or replace the wiring harness between the connector C-13 and connector C-46 because the wiring harness is shorted to the power supply.
8 INSPECT CAN LINE BETWEEN CONNECTOR C-39 AND CONNECTOR C-13 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Repair or replace the wiring harness between the connector C-39 and connector C-13 because the wiring harness is shorted to the power supply.
9 INSPECT CAN LINE BETWEEN DRIVER MONITORING CAMERA UNIT AND CONNECTOR C-39 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at driver monitoring camera unit terminals 1F and 1E.
  • Is the voltage between 1.5-3.5 V?
Yes Go to Step 11.
No Go to the next step.
10 INSPECT DRIVER MONITORING CAMERA UNIT FOR SHORT TO POWER SUPPLY
Yes Replace the driver monitoring camera unit because there is a short to the power supply in the driver monitoring camera unit.
(See DRIVER MONITORING CAMERA UNIT REMOVAL/INSTALLATION (US) .)
No Repair or replace the wiring harness between the driver monitoring camera unit and connector C-39 because the wiring harness is shorted to the power supply.
11 INSPECT CAN LINE BETWEEN CONNECTOR C-16 AND CONNECTOR C-39 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Repair or replace the wiring harness between the connector C-16 and connector C-39 because the wiring harness is shorted to the power supply.
12 INSPECT CAN LINE BETWEEN CONNECTOR C-27 AND CONNECTOR C-16 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Repair or replace the wiring harness between the connector C-27 and connector C-16 because the wiring harness is shorted to the power supply.
13 INSPECT DRIVER FORWARD SENSING CAMERA (FSC) FOR SHORT TO POWER SUPPLY
Yes Replace the forward sensing camera (FSC) because there is a short to the power supply in the forward sensing camera (FSC).
(See FORWARD SENSING CAMERA (FSC) REMOVAL/INSTALLATION .)
No Repair or replace the wiring harness between the forward sensing camera (FSC) and connector C-27 because the wiring harness is shorted to the power supply.