Power Distribution: Other Jeep Commander I

INTEGRATED POWER MODULE

All of the current from the battery and the generator output enters the integrated power module via a stud on the top of the module. Internal connections of all of the power distribution center circuits is accomplished by a combination of bus bars and a printed circuit board.

Scheme 3

Scheme 4

1. Disconnect and isolate the battery negative cable.
2. Remove the Integrated Power Module (IPM) cover by pulling up on the cover tabs (7) and pivoting the cover outward.
3. Remove the nut (2) from the IPM B+ terminal stud.
4. Remove the battery positive cable (3) from the IPM B+ terminal stud.
5. Using a suitable flat bladed tool, depress the three retaining clips and lift the IPM (1) straight up off of the bracket tabs (2).
6. Disconnect the two IPM connectors (4).
7. Disconnect the two Front Control Module (FCM) connectors (5).
8. Remove the IPM assembly from the vehicle.

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. The IOD fuse can be removed to avoid discharging the battery by disconnecting non-essential, low-current memory functions that are normally on at all times. A detent on the IOD fuse holder allows it to be stored in its normal cavity but out of contact. The holder is pushed into place to restore power to the systems it supplies. The following circuits are protected by the IOD fuse

1. Cluster (CCN)
2. Electronic Overhead Module (EOM
3. Sentry Key Remote Entry Module (SKREEM)
4. Video Module (DVD system)
5. Hands Free Telephone Module
6. Map Lamps
7. Glove Box Lamp
8. Courtesy Lamps
9. Radio
10. Security Module (export markets)
11. Traffic Control Module (export markets)

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.

The IOD fuse is disconnected from Integrated Power Module 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 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 discharged or damaged.

Scheme 5

An electrical Junction Block (JB) is concealed beneath the driver side of the instrument panel in the passenger compartment of the vehicle. The JB is accessed by pulling down on the steering column opening cover (2) exposing the lower steering column and portions of the instrument panel wiring harness. The JB combines the functions previously provided by a separate fuseblock module and relay center. The JB serves to simplify and centralize numerous electrical components, as well as to distribute electrical current to many of the accessory systems in the vehicle. It also eliminates the need for numerous splice connections. The JB houses blade-type mini fuses, blade-type automatic resetting circuit breakers and International Standards Organization (ISO) relays.

Scheme 6

The molded plastic JB housing is secured with four screws and two snap retainers to the JB mounting bracket behind the instrument panel steering column opening cover (3). The steering column opening cover can be pulled downward to disengage the latches and provide service access to all of the fuses, relays and wire harness connectors (1) of the JB. Refer to COVER-STEERING COLUMN OPENING for additional service information.

The JB contains six relays that are integral to the housing assembly. The relays cannot be replaced separately. If any of the relays are diagnosed inoperative or damaged the complete JB unit must be replaced. The six relays are

1. Lock relay
2. Unlock relay
3. Driver door unlock relay
4. Rear wiper relay
5. Ignition "RUN" relay
6. Ignition "RUN/ACCESSORY DELAY" relay

The JB unit cannot be repaired and is only serviced as an assembly. If any internal circuit or the JB housing is inoperative or damaged, the entire JB unit must be replaced. See REMOVAL for the appropriate procedure.

JUNCTION BLOCK

All of the circuits entering and leaving the Junction Block (JB) do so through three wire harness connectors, which are connected to the JB through integral connector receptacles molded into the JB housing. Internal connection of all of the JB circuits is accomplished by a printed circuit board. Refer to the SYSTEM WIRING DIAGRAMS article for complete circuit diagrams. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

Scheme 7

Scheme 8

Scheme 9

1. Disconnect and isolate the battery negative cable.
2. Remove the steering column opening cover (2). This is accomplished by pulling outward on the upper edge of the cover to disengage the retaining clips and removing the screw at the bottom of the cover.
3. Disconnect the two bottom side Junction Block (JB) connectors.
4. Reach behind the JB to disconnect the top side JB connector.
5. Remove the screws (1) that secure the JB to the mounting bracket.
6. Disengage the two snap clips (2) that secure the top of the JB to the mounting bracket. Push the top of the junction block out of the top of the bracket and pull it upward to disengage the lower retaining tabs (3).
7. Remove the JB from the vehicle by lowering out of the opening at the bottom of the instrument panel.

Note. If the Junction Block (JB) is being replaced with a new unit, be certain to transfer each of the fuses, circuit breakers and relays from the inoperative JB to the proper cavities of the replacement JB. Refer to Junction Block in SYSTEM WIRING DIAGRAMS article for the location of complete circuit diagrams and cavity assignments for the JB.

1. Position the JB into its mounting location on the JB mounting bracket.
2. Align the two lower retaining tabs (3) with the slots in the bottom of the bracket.
3. Align the snap clips (2) at the top of the JB with the mounting slots in the top of the bracket.
4. Grasp the JB firmly with both hands and push it into the bracket to engage the two snap clips (2) that secure the top of the JB.
5. Install and tighten the four screws (1) that secure the JB to the mounting bracket. Tighten the screws to 2 N.m (20 in. lbs.).
6. Reconnect the top side wire harness connector to the connector receptacle on the JB.
7. Reconnect the bottom side wire harness connectors to the connector receptacles on the JB.
8. Install the steering column opening cover (2). Install the screw and firmly push the top of the panel inward to engage the top retaining clips.
9. Reconnect the battery negative cable.

The electrical current distributed throughout this vehicle is directed through the Power Distribution Center (PDC) (1) and Integrated Power Module (IPM) (2). The PDC is located in the left front corner of the engine compartment, between the IPM and the brake master cylinder. The PDC houses maxi-type cartridge fuses, which replace most in-line fusible links. Some fusible links still exist in the electrical harness depending on powertrain combination. The PDC also houses blade-type mini fuses, and International Standards Organization (ISO) relays.

Scheme 10

The PDC housing is secured in the engine compartment at three points. Integral mounts on both sides of the PDC housing engage and latch to stanchions that are integral to the molded plastic support bracket. The PDC is integral to the headlamp and dash wire harness, which exits from the bottom of the PDC housing. The PDC housing has a molded plastic cover that includes two integral latches and pivot hooks that snap over a hinge pin on the side of the PDC housing. The PDC cover is easily opened or removed for service access and has a convenient fuse and relay layout map integral to the inside surface of the cover to ensure proper component identification.

The PDC cannot be repaired and is only serviced as a unit with the headlamp and dash wire harness. If the PDC main housing unit, fuse wedges or the bus bars are inoperative or damaged, the complete headlamp and dash wire harness unit must be replaced.

All of the current from the battery and the generator output enters the PDC through two cables and a single two-holed eyelet that is secured with nuts to the two PDC B(+) terminal studs just inside the front end of the PDC housing. The PDC cover is unlatched and opened to access the battery and generator output connection B(+) terminal studs, the fuses or the relays. Internal connection of all of the PDC circuits is accomplished by an intricate combination of hard wiring and bus bars.

For complete circuit diagrams, refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

POWER OUTLET

This vehicle is equipped with three 12-volt electrical outlets. The outlets are located in the following locations

1. One outlet in the cargo area left quarter trim panel.
2. Two outlets in the instrument panel center stack under the heat/air conditioning controller.

All of the outlets have power at all times, and include tethered covers.

Scheme 11

1. Disconnect and isolate the battery negative cable.
2. Pull the cigar lighter knob and element (1) out of the cigar lighter receptacle base (6), or unsnap the protective cap from the power outlet receptacle base (6).
3. Look inside the cigar lighter or power outlet receptacle base and note the position of the rectangular retaining bosses (3) of the mount that secures the receptacle base to the panel (4).
4. Insert a pair of external snap ring pliers (5) into the cigar lighter or power outlet receptacle base and engage the tips of the pliers with the retaining bosses of the mount.
5. Squeeze the pliers to disengage the mount retaining bosses from the receptacle base and, using a gentle rocking motion, pull the pliers and the receptacle base out of the mount.
6. Pull the receptacle base away from the instrument panel far enough to access the instrument panel wire harness connector (2).
7. Disconnect the instrument panel wire harness connector (2) from the cigar lighter or power outlet receptacle base (6).
8. Remove the cigar lighter or power outlet mount from the instrument panel.

1. Connect the instrument panel wire harness connector to the cigar lighter or power outlet receptacle base connector receptacle.
2. Install the cigar lighter or power outlet mount into the instrument panel.
3. Align the splines on the outside of the cigar lighter or power outlet receptacle base connector receptacle with the grooves on the inside of the mount.
4. Press firmly on the cigar lighter or power outlet receptacle base until the retaining bosses of the mount are fully engaged in their receptacles.
5. Install the cigar lighter knob and element into the cigar lighter receptacle base, or the protective cap into the power outlet receptacle base.
6. Connect the battery negative cable.