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DTC: 28:Er09 [AUDIO UNIT]

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2016 – MX-5 – Body and Accessories

DTC: 28:Er09 [AUDIO UNIT]

Description

No USB playback function file/track

Detection condition

  • When USB device connected, connection error detected.

  • When USB device connected, audio unit internal malfunction detected.

  • When USB device connected, read error detected.

Fail-safe

Not applicable

Possible cause

  • USB device malfunction

  • Incompatible USB device (format) used

  • Auxiliary jack/USB port connector or terminal malfunction

  • Auxiliary jack/USB port malfunction

  • Audio unit connector or terminal malfunction

  • Short to ground in wiring harness between the following terminals:

    • Audio unit terminal 3C—Auxiliary jack/USB port terminal UA

    • Audio unit terminal 3B—Auxiliary jack/USB port terminal UC

    • Audio unit terminal 3D—Auxiliary jack/USB port terminal UB

    • Audio unit terminal 3A—Auxiliary jack/USB port terminal UD

  • Open circuit in wiring harness between the following terminals:

    • Audio unit terminal 3C—Auxiliary jack/USB port terminal UA

    • Audio unit terminal 3B—Auxiliary jack/USB port terminal UC

    • Audio unit terminal 3D—Auxiliary jack/USB port terminal UB

    • Audio unit terminal 3A—Auxiliary jack/USB port terminal UD

  • Audio unit malfunction

Diagnostic Procedure

Step

Inspection

Action

1

VERIFY IF MALFUNCTIONING LOCATION IS USB DEVICE

  • After obtaining the customer’s consent, connect a normal USB device that was not used when the malfunction occurred.

  • Is the connection detected?

Yes

System is normal. (Explain to the customer that there is a malfunction in the USB device which was used or a malfunction occurred due to use of an incompatible USB device (format).)

No

Go to the next step.

2

INSPECT AUXILIARY JACK/USB PORT CONNECTOR CONDITION

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the auxiliary jack/USB port 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 7.

3

INSPECT AUXILIARY JACK/USB PORT

Yes

Go to the next step.

No

Replace the auxiliary jack/USB port, then go to Step 7.

(See AUXILIARY JACK/USB PORT REMOVAL/INSTALLATION.)

4

INSPECT AUDIO UNIT CONNECTOR CONDITION

  • Disconnect the audio unit 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 7.

5

INSPECT WIRING HARNESS BETWEEN AUDIO UNIT AND AUXILIARY JACK/USB PORT FOR SHORT TO GROUND

  • Verify that the auxiliary jack/USB port and audio unit connectors are disconnected.

  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:

    • Auxiliary jack/USB port terminal UA

    • Auxiliary jack/USB port terminal UC

    • Auxiliary jack/USB port terminal UB

    • Auxiliary jack/USB port terminal UD

  • Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

  • Audio unit terminal 3C—Auxiliary jack/USB port terminal UA

  • Audio unit terminal 3B—Auxiliary jack/USB port terminal UC

  • Audio unit terminal 3D—Auxiliary jack/USB port terminal UB

  • Audio unit terminal 3A—Auxiliary jack/USB port terminal UD

    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.

Go to Step 7.

No

Go to the next step.

6

INSPECT WIRING HARNESS BETWEEN AUDIO UNIT AND AUXILIARY JACK/USB PORT FOR OPEN CIRCUIT

  • Verify that the auxiliary jack/USB port and audio unit connectors are disconnected.

  • Inspect for continuity between the following terminals (wiring harness-side):

    • Audio unit terminal 3C—Auxiliary jack/USB port terminal UA

    • Audio unit terminal 3B—Auxiliary jack/USB port terminal UC

    • Audio unit terminal 3D—Auxiliary jack/USB port terminal UB

    • Audio unit terminal 3A—Auxiliary jack/USB port terminal UD

  • Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

  • Audio unit terminal 3C—Auxiliary jack/USB port terminal UA

  • Audio unit terminal 3B—Auxiliary jack/USB port terminal UC

  • Audio unit terminal 3D—Auxiliary jack/USB port terminal UB

  • Audio unit terminal 3A—Auxiliary jack/USB port terminal UD

    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 the next step.

No

Go to the next step.

7

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

8

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 [AUDIO UNIT].)

No

DTC troubleshooting completed.

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