Vehicle ON Engine OFF mode

This mode is used to have all modules powered up and communicating on the serial data line. In order to achieve this mode the customer must have a valid keyless entry transmitter within the passenger compartment of the vehicle and the transmission in Park or Neutral. Once that criteria is met, the customer must press and hold the ACC/OFF portion of the Start/ACC/OFF mode button for 5 seconds. The vehicle will power up with the engine OFF. A low transmitter battery or radio frequency (RF) interference from aftermarket devices, such as 2-way radios, power inverters, computers, etc., may cause a system malfunction. High RF traffic areas, such as gas stations that use pay-at-the-pump RF transponders, may also cause interference that could lead to a malfunction.