Description

• U0184:00

• Communication error with tuner and amp unit (TAU)

• U0187:00

• Communication error with CD player

Detection condition

• U0184:00

• The connectivity master unit (CMU) cannot receive a CAN signal from the tuner and amp unit (TAU) for 5 s or more.

• U0187:00

• The connectivity master unit (CMU) cannot receive a CAN signal from the CD player for 5 s or more.

Fail-safe

• U0184:00

• Not applicable

• U0187:00

• Not applicable

Possible cause

• Connectivity master unit (CMU) connector or terminal malfunction

• Tuner and amp unit (TAU) connector or terminal malfunction

• CD player connector or terminal malfunction

• Connector C-16 connector or terminal malfunction

• Connector C-25 connector or terminal malfunction

• Connector C-40 connector or terminal malfunction

• Connector C-42 connector or terminal malfunction

• Short to power supply in wiring harness between the following terminals:

• Connectivity master unit (CMU) terminal 2I—Tuner and amp unit (TAU) terminal 2O

• Connectivity master unit (CMU) terminal 2I—CD player terminal G

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

• Connectivity master unit (CMU) terminal 2J—Tuner and amp unit (TAU) terminal 2Q

• Connectivity master unit (CMU) terminal 2J—CD player terminal H

• Short between circuits in the following wiring harness:

• Connectivity master unit (CMU) terminal 2I—Tuner and amp unit (TAU) terminal 2O

• Connectivity master unit (CMU) terminal 2J—Tuner and amp unit (TAU) terminal 2Q

• Connectivity master unit (CMU) terminal 2I—CD player terminal G

• Connectivity master unit (CMU) terminal 2J—CD player terminal H

• Open circuit in wiring harness between the following terminals:

• Connectivity master unit (CMU) terminal 2I—Tuner and amp unit (TAU) terminal 2O

• Connectivity master unit (CMU) terminal 2J—Tuner and amp unit (TAU) terminal 2Q

• Connectivity master unit (CMU) terminal 2I—CD player terminal G

• Connectivity master unit (CMU) terminal 2J—CD player terminal H

• Open circuit in wiring harness between tuner and amp unit (TAU) terminal 2W and ground

• Open circuit in wiring harness between CD player terminal A and ground

• CD player power supply circuit malfunction

• Short to ground in wiring harness between MAIN 200 A fuse and CD player terminal Z

• 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 CD player terminal Z

• Tuner and amp unit (TAU) malfunction

• CD player malfunction

• Connectivity master unit (CMU) malfunction

Step

Inspection

Action

1

• Switch the ignition ON (engine off).

• Perform the DTC inspection using the M-MDS.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

  (See DTC INSPECTION [CONNECTIVITY MASTER UNIT].)

• Is the power supply related DTC displayed?

Yes

NOTE:

• It may be affected by power supply-related malfunction.

Repair the malfunctioning location according to the applicable DTC troubleshooting.

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

(See DTC TABLE [CONNECTIVITY MASTER UNIT].)

No

Go to the next step.

2

• Measure the voltage between connectivity master unit (CMU) terminal 2I (LOCAL-CAN CAN_H side) and body ground.

• Is the voltage B+?

Yes

A short to power supply in CAN_H side circuit of LOCAL-CAN has occurred.

• Go to Step 6.

No

Go to the next step.

3

• Measure the voltage between connectivity master unit (CMU) terminal 2J (LOCAL-CAN CAN_L side) and body ground.

• Is the voltage 0 V?

Yes

A short to ground in CAN_L side circuit of LOCAL-CAN has occurred.

• Go to Step 7.

No

Go to the next step.

4

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Measure the resistance between connectivity master unit (CMU) 2I and 2J terminals (wiring harness side).

• Is the resistance approx. 60 ohms?

Yes

Go to the next step. (LOCAL-CAN is normal)

No

If the resistance is 0 ohm:

• A short between circuits has occurred in LOCAL-CAN.

• Go to Step 8.

If the resistance is 120 ohms:

• An open circuit in the LOCAL-CAN has occurred.

• Go to Step 9.

5

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Clear the DTC for the connectivity master unit (CMU) using the M-MDS.

  (See CLEARING DTC [CONNECTIVITY MASTER UNIT])

• Switch the ignition ON (engine off or on) and wait for 12 s or more.

• Perform the DTC inspection for the connectivity master unit (CMU) using the M-MDS.

  (See DTC INSPECTION [CONNECTIVITY MASTER UNIT])

• Is there any of the following DTCs being displayed?

• U0184:00

• U0187:00

Yes

If U0184:00 is only displayed:

• Go to Step 10.

If U0187:00 is only displayed:

• Go to Step 11.

If all DTCs are displayed:

• Replace the connectivity master unit (CMU), then go to Step 14.

  (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION.)

No

Go to Step 15.

6

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the following connectors:

• Connectivity master unit (CMU)

• Tuner and amp unit (TAU)

• CD player

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Switch the ignition ON (engine off or on).

• Measure the voltage at the following terminals (wiring harness side).

• Connectivity master unit (CMU) terminal 2I

• Tuner and amp unit (TAU) terminal 2O

• CD player terminal G

• Is the voltage 0 V?

Yes

Go to Step 13.

No

Refer to the wiring diagram and verify if there is a common connector between the following terminals:

• Connectivity master unit (CMU) terminal 2I—Tuner and amp unit (TAU) terminal 2O

• Connectivity master unit (CMU) terminal 2I—CD player terminal G

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 power supply.

• Repair or replace the malfunctioning part.

If there is no common connector:

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

Go to Step 14.

7

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the following connectors:

• Connectivity master unit (CMU)

• Tuner and amp unit (TAU)

• CD player

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

• Connectivity master unit (CMU) terminal 2J

• Tuner and amp unit (TAU) terminal 2Q

• CD player terminal H

• 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 2J—Tuner and amp unit (TAU) terminal 2Q

• Connectivity master unit (CMU) terminal 2J—CD player terminal H

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 14.

No

Go to Step 13.

8

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the following connectors:

• Connectivity master unit (CMU)

• Tuner and amp unit (TAU)

• CD player

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

• Connectivity master unit (CMU) terminals 2I and 2J

• Tuner and amp unit (TAU) terminals 2O and 2Q

• CD player terminals G and H

• 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 2I—Tuner and amp unit (TAU) terminal 2O

• Connectivity master unit (CMU) terminal 2J—Tuner and amp unit (TAU) terminal 2Q

• Connectivity master unit (CMU) terminal 2I—CD player terminal G

• Connectivity master unit (CMU) terminal 2J—CD player terminal H

If there is a common connector:

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

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has shorted between circuits.

Go to Step 14.

No

Go to Step 13.

9

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the following connectors:

• Connectivity master unit (CMU)

• Tuner and amp unit (TAU)

• CD player

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

• Connectivity master unit (CMU) terminal 2I—Tuner and amp unit (TAU) terminal 2O

• Connectivity master unit (CMU) terminal 2J—Tuner and amp unit (TAU) terminal 2Q

• Connectivity master unit (CMU) terminal 2I—CD player terminal G

• Connectivity master unit (CMU) terminal 2J—CD player terminal H

• 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 2I—Tuner and amp unit (TAU) terminal 2O

• Connectivity master unit (CMU) terminal 2J—Tuner and amp unit (TAU) terminal 2Q

• Connectivity master unit (CMU) terminal 2I—CD player terminal G

• Connectivity master unit (CMU) terminal 2J—CD player terminal H

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 14.

No

Go to Step 13.

10

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the tuner and amp unit (TAU) connector.

• Inspect the wiring harness for continuity between tuner and amp unit (TAU) terminal 2W and ground.

• Is there continuity?

Yes

Replace the tuner and amp unit (TAU), then go to Step 14.

(See TUNER AND AMP UNIT (TAU) REMOVAL/INSTALLATION.)

No

Repair or replace the wiring harness which has an open circuit, then go to Step 14.

11

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the CD player connector.

• Inspect the wiring harness for continuity between CD player terminal A (wiring harness side) and ground.

• Is there continuity?

Yes

Go to the next step.

No

Repair or replace the wiring harness which has an open circuit, then go to Step 14.

12

• Verify that the CD player connector is disconnected.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Switch the ignition ON (engine off or on).

• Measure the voltage at CD player terminal Z (wiring harness side).

• Is the voltage B+?

Yes

Replace the CD player, then go to Step 14.

(See CD PLAYER REMOVAL/INSTALLATION.)

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 CD player terminal Z.

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 battery positive terminal and CD player terminal Z.

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 14.

13

• Always reconnect all disconnected connectors.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Clear the DTC for the connectivity master unit (CMU) using the M-MDS.

  (See CLEARING DTC [CONNECTIVITY MASTER UNIT])

• Switch the ignition ON (engine off or on) and wait for 12 s or more.

• Perform the DTC inspection for the connectivity master unit (CMU) using the M-MDS.

  (See DTC INSPECTION [CONNECTIVITY MASTER UNIT].)

• Is there any of the following DTCs being displayed?

• U0184:00

• U0187:00

Yes

If U0184:00 is only displayed:

• Replace the tuner and amp unit (TAU), then go to the next step.

  (See TUNER AND AMP UNIT (TAU) REMOVAL/INSTALLATION.)

If U0187:00 is only displayed:

• Replace the CD player, then go to the next step.

  (See CD PLAYER REMOVAL/INSTALLATION.)

If all DTCs are displayed:

• Replace the connectivity master unit (CMU), then go to the next step.

  (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION.)

No

Go to Step 15.

14

• Always reconnect all disconnected connectors.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Clear the DTC for the connectivity master unit (CMU) using the M-MDS.

  (See CLEARING DTC [CONNECTIVITY MASTER UNIT].)

• Switch the ignition ON (engine off or on) and wait for 12 s or more.

• Perform the DTC inspection for the connectivity master unit (CMU) using the M-MDS.

  (See DTC INSPECTION [CONNECTIVITY MASTER UNIT].)

• Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the connectivity master unit (CMU).

  (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

15

• 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.