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DTC B108E:1C [CONNECTIVITY MASTER UNIT]

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2016 – MX-5 – Body and Accessories

DTC B108E:1C [CONNECTIVITY MASTER UNIT]

Description

Low power supply voltage input to center display

Detection condition

  • The connectivity master unit (CMU) detected any of the following conditions for 5 s or more with the ignition switched ON (engine off or on).

    • TFT LCD driver voltage 3.8 V or less

    • LED drive voltage 14.0 V or less

    • Touch panel IC voltage 3.9 V or less

Fail-safe

  • Stops operation of the center display.

Possible cause

  • DTCs are stored in the PCM.

  • Battery malfunction

  • Generator malfunction

  • Center display connector or terminal malfunction

  • Center display B+ power supply circuit malfunction

    • Short to ground in wiring harness between MAIN 200 A fuse and center display terminal 1H

    • INTERIOR 15 A fuse malfunction

    • ROOM 25 A fuse malfunction

    • MAIN 200 A fuse malfunction

    • Open circuit in wiring harness between battery positive terminal and center display terminal 1H

  • Center display ACC power supply circuit malfunction

    • Short to ground in wiring harness between MIRROR 7.5 A fuse and center display terminal 1G

    • MIRROR 7.5 A fuse malfunction

    • Open circuit in wiring harness between ACC relay terminal C and center display terminal 1G

  • Center display malfunction

  • Connectivity master unit (CMU) malfunction

Diagnostic Procedure

Step

Inspection

Action

1

 VERIFY PCM DTCs

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

No

Go to the next step.

2

 INSPECT BATTERY

Yes

Go to the next step.

No

Recharge or replace the battery, then go to Step 8.

(See BATTERY RECHARGING.)

(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

3

 INSPECT GENERATOR

Yes

Go to the next step.

No

Replace the generator, then go to Step 8.

(See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

4

 INSPECT CENTER DISPLAY CONNECTOR CONDITION

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the center display 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.

5

 VERIFY CENTER DISPLAY B+ POWER SUPPLY VOLTAGE

Yes

Go to the next step.

No

Inspect the INTERIOR 15 A fuse, ROOM 25 A fuse, and MAIN 200 A fuse.

  • Any fuse is blown:

    • Refer to the wiring diagram and verify if there is a common connector between MAIN 200 A fuse and center display terminal 1H.

        • 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 part.

        If there is no common connector:

      • Repair or replace the wiring harness which has a short to ground.

      • Replace the fuse.

  • Any fuse is damaged:

    • Replace the fuse.

  • All fuses are normal:

    • Refer to the wiring diagram and verify if there is a common connector between positive battery terminal and center display terminal 1H.

        • 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 an open circuit.

      • Repair or replace the malfunctioning part.

        If there is no common connector:

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

Go to Step 8.

6

 VERIFY CENTER DISPLAY ACC POWER SUPPLY VOLTAGE

  • Switch the ignition to ACC.

  • Measure the voltage at center display terminal 1G (wiring harness-side).

  • Is the voltage B+?

Yes

Go to the next step.

No

Inspect the MIRROR 7.5 A fuse.

  • If the fuse is blown:

    • Refer to the wiring diagram and verify if there is a common connector between MIRROR 7.5 A fuse and center display terminal 1G.

        • 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 part.

        If there is no common connector:

      • Repair or replace the wiring harness which has a short to ground.

      • Replace the fuse.

  • If the fuse is damaged:

    • Replace the fuse.

  • If the fuse is normal:

    • Refer to the wiring diagram and verify if there is a common connector between ACC relay terminal C and center display terminal 1G.

        • 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 an open circuit.

      • Repair or replace the malfunctioning part.

        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.

Go to the next step.

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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