RAM 3500 Chassis Cab Truck 2WD L6-6.7L DSL Turbo (2010)
Overdrive Switch: Testing and Inspection
TOW /HAUL OVERDRIVE OFF SWITCH (DIESEL)
For a complete wiring diagram, Refer to the Wiring Information
Theory of Operation
The tow/haul overdrive OFF (control) switch is located in the shift lever arm. The switch is a momentary contact device that signals the ECM/PCM to
toggle current status of the overdrive function. At ignition on, overdrive operation is allowed. Pressing the Tow/Haul Overdrive Off switch once causes
the Tow/haul Overdrive OFF mode to be entered and the Tow/Haul lamp to be illuminated. Pressing the switch a second time causes normal overdrive
operation to be restored and the Tow/haul lamp to be turned off. The Tow/haul Overdrive OFF mode defaults to ON after the ignition switch is cycled
OFF and ON. The normal position for the control switch is the ON position. The switch must be in this position to energize the solenoid and allow a 3-4
upshift. The control switch indicator light illuminates only when the Tow/haul Overdrive Off switch is turned to the OFF position, or when illuminated
by the transmission control module.
