Description

Connectivity master unit (CMU) internal malfunction (poor data read-outs)

Detection condition

• The connectivity master unit (CMU) cannot read data from the NVRAM in the connectivity master unit (CMU) with the ignition switched to ACC or ON (engine off or on).

Fail-safe

Not applicable

Possible cause

• Connectivity master unit (CMU) malfunction

System wiring diagram

Not applicable

Step

Inspection

Action

1

• 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 7 s or more.

• Retrieve the connectivity master unit (CMU) DTCs using the M-MDS.

  (See DTC INSPECTION [CONNECTIVITY MASTER UNIT].)

• Is the same DTC displayed?

Yes

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

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

No

Go to the next step.

2

• 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.