DESCRIPTION
The power distribution system for this vehicle consists of the following components
- Totally Integrated Power Module (TIPM)
- Fuse Block
For specific fuse location and types, refer to FUSE - RELAY LOCATIONS AND TYPES, SPECIFICATIONS .
OPERATION
The power distribution system for this vehicle is designed to provide safe, reliable, centralized, and convenient to access, distribution of the electrical current required to operate all of the many standard and optional factory-installed electrical and electronic powertrain, chassis, safety, comfort and convenience systems. At the same time, these systems were designed to provide centralized locations for conducting diagnosis of faulty circuits, and for sourcing the additional current requirements of many aftermarket vehicle accessory and convenience items.
These power distribution systems also incorporate various types of circuit control and protection features, including fuses and relays.
Scheme 5
An electrical Fuse Block is located in the left front bumper fascia. It serves to simplify and centralize numerous electrical components, as well as to distribute electrical current to many of the accessory systems in the vehicle.
There are two clips that retain the fuse block cover to the fuse block. The cover can be removed to service the fuses and relays by depressing the clips and lifting off the cover. If fuse block wire terminal or insulator service is required the complete fuse block assembly must be removed. Refer to BLOCK, FUSE, REMOVAL .
The fuse block houses relays and blade-type fuses. The fuses, relays and fuse block unit are available for service replacement. Refer to SYSTEM WIRING DIAGRAMS for complete circuit diagrams.
All vehicles are equipped with an Ignition-Off Draw (IOD) fuse that is disconnected within the Totally Integrated Power Module (TIPM) when the vehicle is shipped from the factory. Dealer personnel are to reconnect the IOD fuse in the TIPM as part of the preparation procedures performed just prior to new vehicle delivery.
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, including the clock. 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 Totally Integrated Power Module (TIPM) fuse cavities 7 and 8 in a preset fuse holder. 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 serves no useful purpose to the dealer technician in the service or diagnosis of any vehicle system or condition, other than the same purpose as that of any other standard circuit protection device.
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 discharged or damaged.
The inverter module is located in the instrument panel. The A/C outlet is mounted in the center console. The inverter module provides A/C power for user accessories. The inverter converts the 12 Volt DC from the battery system to a 110 Volt AC output.
The AC power outlet receives 12 volts from the Totally Integrated Power Module (TIPM) and passes it as an enable signal to the inverter module. The inverter module also receives 12 volts via the TIPM and inverts this to a 110 volt AC output. The enable signal received from the power outlet enables the inverter to convert the received voltage and pass it to the power outlet to power external devices.
All of the current to the Totally Integrated Power Module (TIPM) comes directly from the positive battery cable to a stud located on the bottom of the TIPM. The cable is secured to the TIPM stud with a nut. Internal connection of all the Totally Integrated Power Module (TIPM) circuits is accomplished by an intricate network of hard wiring and bus bars. Refer to SYSTEM WIRING DIAGRAMS for complete circuit diagrams.
The fuses and TIPM housing assembly are available for service replacement.