The mode changes between ACCESSORY and ON, but it is difficult to change to OFF (LOCK) (Keyless Access System)

Diagnostic procedure 

• Check the body control module
• Check the gauge control module
• Check the TCM

Also check for 

• Body control module
• Gauge control module
• PCM
• B-CAN communication line open/short
• F-CAN communication line open/short
• Speed signal line open
• TCM