Journey FWD V6-3.5L (2009)
Backup Lamp Switch: Description and Operation
Backup Lamp Switch - Operation
OPERATION
The backup lamp switch controls a path to ground for the Totally Integrated Power Module (TIPM) on the reverse switch signal circuit. The TIPM reads
this input through an internal pull-up, then controls an output through a high side driver that regulates the flow of battery voltage to the backup lamp
bulbs as appropriate on the backup lamp feed circuit. The switch plunger is mechanically actuated by the gearshift mechanism within the transmission,
which will depress the switch plunger and close the switch contacts whenever the REVERSE gear has been selected. The switch receives ground at all
times through a take out and eyelet terminal of the wire harness that is secured to the body sheet metal.
The backup lamp switch as well as the hard wired inputs and outputs of the switch may be diagnosed using conventional diagnostic tools and procedures.
Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the electronic
controls and communication between other modules and devices that rely upon inputs from the backup lamp switch. The most reliable, efficient, and
accurate means to diagnose the electronic controls and communication related to backup lamp switch operation requires the use of a diagnostic scan tool.
Refer to the appropriate diagnostic information.
