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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - Connectivity Master Unit >> DTC B108E:06 [Connectivity Master Unit] >> Diagnostic Procedure

Diagnostic Procedure

DTC B108E:06 DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY THAT INCORRECT DISPLAY IS NOT INSTALLED
  • Verify that the display installed on the vehicle is a Mazda genuine center display.
  • Is the installed display a Mazda genuine center display?
 Yes Go to the next step.
No Explain to the customer that a display other than a Mazda genuine is installed.
2 INSPECT CENTER DISPLAY CONNECTOR CONDITION
  • Switch the ignition off.
  • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • 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 8.
3 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 8.
4 INSPECT CENTER DISPLAY CIRCUIT FOR SHORT TO GROUND
  • Verify that the center display and connectivity master unit (CMU) connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground.
    • Center display terminal 2B
      • Center display terminal 2D
  • Is there continuity?
 Yes Refer to the wiring diagram and verify if there is a common connector between the following terminals.
  • Connectivity master unit (CMU) terminal 3B and center display terminal 2B
  • Connectivity master unit (CMU) terminal 3D and center display terminal 2D

    If there is a common connector:

  • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
  • Repair or replace the malfunctioning location.

    If there is no common connector:

  • Repair or replace the wiring harness which is shorted to ground.

Go to Step 8.
No Go to the next step.
5 INSPECT CENTER DISPLAY CIRCUIT FOR SHORT TO POWER SUPPLY
  • Verify that the center display and connectivity master unit (CMU) connectors are disconnected.
  • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Switch the ignition ON (engine off or on).
  • Measure the voltage at the following terminals (wiring harness-side).
    • Center display terminal 2B
      • Center display terminal 2D
  • Is the voltage 0 V?
 Yes Go to the next step.
No Refer to the wiring diagram and verify if there is a common connector between the following terminals.
  • Connectivity master unit (CMU) terminal 3B and center display terminal 2B
  • Connectivity master unit (CMU) terminal 3D and center display terminal 2D

    If there is a common connector:

  • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to power supply to determine the malfunctioning location.
  • Repair or replace the malfunctioning location.

    If there is no common connector:

  • Repair or replace the wiring harness which is shorted to the power supply.

Go to Step 8.
6 INSPECT CENTER DISPLAY CIRCUIT FOR OPEN CIRCUIT
  • Switch the ignition off.
  • Disconnect the negative battery terminal.

    (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)

  • Verify that the center display and connectivity master unit (CMU) connectors are disconnected.
  • Inspect the wiring harness for continuity between the following terminals (wiring harness-side).
    • Connectivity master unit (CMU) terminal 3B and center display terminal 2B
      • Connectivity master unit (CMU) terminal 3D and center display terminal 2D
  • Is there continuity?
 Yes Go to the next step.
No Refer to the wiring diagram and verify if there is a common connector between the following terminals.
  • Connectivity master unit (CMU) terminal 3B and center display terminal 2B
  • Connectivity master unit (CMU) terminal 3D and center display terminal 2D
  • If there is a common connector:
  • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
  • Repair or replace the malfunctioning location.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit.

Go to Step 8.
7 VERIFY IF MALFUNCTIONING LOCATION IS CENTER DISPLAY DEPENDING ON REPEATABILITY Yes Replace the center display, then go to the next step.
(See CENTER DISPLAY REMOVAL/INSTALLATION .)
No Go to Step 9.
8 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Repeat the inspection from Step 1.
No Go to the next step.
9 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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