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Home >> Mazda >> 2017 >> CX-9 Touring, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - Connectivity Master Unit >> DTC B12BD-11; Rear Mount Camera Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

DIAGNOSTIC PROCEDURE

Step Inspection Action
1 INSPECT REAR MOUNT CAMERA CONNECTOR CONDITION
  • Switch the ignition off.
  • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Disconnect the rear mount camera connector.
  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
  • Is the connector normal?
 Yes Go to the next step.
No Repair or replace the connector, then go to Step 5.
2 INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR CONDITION
  • Disconnect the connectivity master unit (CMU) connector.
  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
  • Is the connector normal?
 Yes Go to the next step.
No Repair or replace the connector, then go to Step 5.
3 INSPECT REAR MOUNT CAMERA CIRCUIT FOR SHORT TO GROUND
  • Verify that the rear mount camera and connectivity master unit (CMU) connectors are disconnected.
  • Inspect for continuity between rear mount camera terminal A (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Refer to the wiring diagram and verify if there is a common connector between connectivity master unit (CMU) terminal 1C and rear mount camera terminal A.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
  • Repair or replace the malfunctioning location.

If there is no common connector:
  • Repair or replace the wiring harness which has a short to ground.

Go to Step 5.
No Go to the next step.
4 VERIFY IF MALFUNCTIONING LOCATION IS REAR MOUNT CAMERA DEPENDING ON REPEATABILITY Yes Replace the rear mount camera, then go to the next step.
(See REAR MOUNT CAMERA REMOVAL/INSTALLATION .)
No Go to Step 6.
5 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
6 VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?
 Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [CONNECTIVITY MASTER UNIT] .)
No DTC troubleshooting completed.
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