Diagnostic trouble code (DTC) information

Condition 

The M4- button must be activated before the diagnostic trouble code (DTC) can be detected. Diagnostic trouble code (DTC) PSM-0027 is stored if button M4- has been activated for longer than 60 seconds.

Possible Source 

• Button M4- has jammed in the depressed position.
• Defective control panel.

Fault symptom[s] 

• The operation button does not function.