RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
Power Interrupt Connector/Switch: Description and Operation
IOD FUSE
All vehicles are equipped with an Ignition-Off Draw (IOD) fuse that is disconnected within the Integrated Power Module when the vehicle is
shipped from the factory. Dealer personnel are to reconnect the IOD fuse in the Integrated Power Module as part of the preparation procedures
performed just prior to new vehicle delivery.
Fig. 6 IOD Fuse Location
A laser printed fuse layout map is integral to the Integrated Power Module cover to ensure proper fuse identification. The IOD fuse is a 20 ampere
mini blade-type fuse, located in fuse cavity # 51 (Fig. 6).
The fuse is secured within a black molded plastic fuse holder and puller unit that serves both as a tool for disconnecting and reconnecting the fuse
in its Integrated Power Module cavity, and as a fuse holder that conveniently stores the fuse in the same Integrated Power Module cavity after it
has been disconnected.
Circuits Included With IOD Fuse
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Cluster (CCN)
-
Diagnostic Connector
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Map Lamps
-
Glove Box Lamp
-
Courtesy Lamps
-
Radio
-
Underhood Lamp
The term ignition-off draw identifies a normal condition where power is being drained from the battery with the ignition switch in the OFF
position. The IOD fuse feeds the memory and sleep mode functions for some of the electronic modules in the vehicle as well as various other
accessories that require battery current when the ignition switch is in the OFF position. The only reason the IOD fuse is disconnected is to reduce
the normal IOD of the vehicle electrical system during new vehicle transportation and pre-delivery storage to reduce battery depletion, while still
allowing vehicle operation so that the vehicle can be loaded, unloaded and moved as needed by both vehicle transportation company and dealer
personnel.
The IOD fuse is disconnected from Integrated Power Module fuse cavity # 51 when the vehicle is shipped from the assembly plant. Dealer
personnel must reconnect the IOD fuse when the vehicle is being prepared for delivery in order to restore full electrical system operation. Once the
vehicle is prepared for delivery, the IOD function of this fuse becomes transparent and the fuse that has been assigned the IOD designation
becomes only another Fused B(+) circuit fuse.
The IOD fuse can be used by the vehicle owner as a convenient means of reducing battery depletion when a vehicle is to be stored for periods not
to exceed about thirty days. However, it must be remembered that disconnecting the IOD fuse will not eliminate IOD, but only reduce this normal
condition. If a vehicle will be stored for more than about thirty days, the battery negative cable should be disconnected to eliminate normal IOD;
and, the battery should be tested and recharged at regular intervals during the vehicle storage period to prevent the battery from becoming
