Electronic Control Modules: Removal & Installation Jeep Liberty I

REMOVAL

Note. Before replacing a body control module (BCM), use the DRBIII(R) scan tool to retrieve the current settings for the BCM programmable features and the current REV/MILE (Tire Size). These settings must be programmed to the replacement BCM using the DRBIII(R) before returning the vehicle to service. New BCM's are shipped in default mode that prevents speedometer indication until a valid tire size is programmed. Refer to the appropriate diagnostic information.

Scheme 11

1. Disconnect and isolate the negative battery cable.
2. Remove the junction block module (JBM) from the instrument panel end bracket on the driver side of the vehicle. See «JUNCTION BLOCK»(ref-175676-S23710447572005042600000) .
3. Remove the screws that secure the BCM to the junction block (JB).
4. Remove the BCM from the JB.
5. If the vehicle is equipped with the optional remote keyless entry (RKE) system, remove the RKE module from the BCM. See «POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEM»(ref-174947) article.

INSTALLATION

1. If the vehicle is equipped with the optional remote keyless entry (RKE) system, reinstall the RKE module into the body control module (BCM). See «POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEM»(ref-174947) article.
2. Position the BCM onto the junction block (JB).
3. Install the screws that secure the BCM to the JB. Tighten the screws to 2.2 N.m (20 in. lbs.).
4. Reinstall the junction block module (JBM) onto the instrument panel end bracket. See «JUNCTION BLOCK»(ref-175676-S23710447572005042600000) .
5. Reconnect the negative battery cable.

Note. If the CAB is being replaced with a new CAB is must be reprogrammed with the use of a DRB III.

1. Install CAB to the HCU. see scheme 6
2. Install mounting bolts. Tighten to 2 N.m (16 in. lbs.).
3. Install the pump electrical connector to the CAB. see scheme 6
4. Install the wiring harness connector to the CAB and push down on the release to secure the connector.
5. Install negative battery cable to the battery.

USE THE DRB SCAN TOOL TO REPROGRAM THE NEW POWERTRAIN CONTROL MODULE (PCM) WITH THE VEHICLES ORIGINAL IDENTIFICATION NUMBER (VIN) AND THE VEHICLES ORIGINAL MILEAGE. IF THIS STEP IS NOT DONE, A DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET.

The PCM is located in the engine compartment near the battery.

Scheme 12

To avoid possible voltage spike damage to the PCM, ignition key must be off, and negative battery cable must be disconnected before unplugging PCM connectors.

1. Disconnect negative battery cable at battery.
2. Remove cover over electrical connectors. Cover snaps onto PCM.
3. Carefully unplug the three 32-way connectors from PCM.
4. Remove three PCM mounting bolts and remove PCM from vehicle.

USE THE DRB SCAN TOOL TO REPROGRAM THE NEW POWERTRAIN CONTROL MODULE (PCM) WITH THE VEHICLES ORIGINAL IDENTIFICATION NUMBER (VIN) AND THE VEHICLES ORIGINAL MILEAGE. IF THIS STEP IS NOT DONE, A DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET.

1. Install PCM and 3 mounting bolts to vehicle.
2. Tighten bolts. Refer to torque specifications.
3. Check pin connectors in the PCM and the three 32-way connectors for corrosion or damage. Also, the pin heights in connectors should all be same. Repair as necessary before installing connectors.
4. Install three 32-way connectors.
5. Install cover over electrical connectors. Cover snaps onto PCM.
6. Install battery cable.
7. Use the DRB scan tool to reprogram new PCM with vehicles original Identification Number (VIN) and original vehicle mileage.

Scheme 13

1. Disconnect and isolate the negative battery cable.
2. If the vehicle is equipped with tilt steering column, move the tilt steering column to the fully lowered position and leave the tilt release lever in the released (down) position.
3. From below the steering column, remove the screws that secure the lower shroud to the upper shroud.
4. Push gently inward on both sides of the upper shroud near the parting line between the upper and lower shrouds to release the snap features that secure the two halves to each other.
5. Remove both the upper and lower shrouds from the steering column.
6. Disconnect the instrument panel wire harness connector for the SKIM from the module connector.
7. The SKIM mounting bracket features a clip that secures the SKIM to the right lower flange of the steering column jacket. Pull downward on the connector end of the SKIM mounting bracket to release this clip from the steering column jacket.
8. Rotate the SKIM and its mounting bracket downwards and then to the side away from the steering column to slide the SKIM antenna ring from around the ignition switch lock cylinder housing. Lift the multi-function switch upward off of the upper steering column housing far enough to remove the SKIM antenna ring formation from between the ignition key release button and the multi-function switch housing.
9. Remove the SKIM from the steering column.

Note. If the SKIM is being replaced with a new unit, the Sentry Key Immobilizer System (SKIS) MUST be initialized before the vehicle can be operated. See POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEM article for SKIS initialization procedure.

1. Position the Sentry Key Immobilizer Module (SKIM) to the right side of the steering column. Lift the multi-function switch upward off of the upper steering column housing far enough to insert the SKIM antenna ring formation between the ignition key release button and the multi-function switch housing.
2. Slide the SKIM antenna ring around the ignition switch lock cylinder housing, then rotate the SKIM and its mounting bracket upwards and toward the steering column.
3. Align the SKIM mounting bracket clip with the right lower flange of the steering column jacket and, push upward firmly and evenly on the connector end of the SKIM mounting bracket to engage this clip with the steering column jacket.
4. Reconnect the instrument panel wire harness connector for the SKIM to the module connector.
5. Position both the upper and lower shrouds onto the steering column.
6. Align the snap features on the lower shroud the upper shroud and apply pressure to snap them together.
7. From below the steering column, install the screws that secure the lower shroud to the upper shroud. Tighten the screws to 2 N.m (18 in. lbs.).
8. If the vehicle is equipped with tilt steering column, move the tilt steering column to the fully raised position and secure it in place by moving the tilt release lever back to the locked (up) position.
9. Reconnect the negative battery cable.

1. Connect the seat wire harness connector to the connector receptacle on the side of the heated seat module.
2. Install the heated seat module on its mounting bracket under the front seat.
3. Verify heated seat system operation.

1. Disconnect and isolate the negative battery cable.
2. Remove the left end cap from the instrument panel.
3. Unsnap and remove the left outboard trim bezel from the instrument panel. Located just to the left of the steering column.
4. Remove the steering column opening cover. See «STEERING COLUMN»(ref-174913) article.
5. Remove the left cowl trim panel from the vehicle.
6. Remove the courtesy lamp from under the left side of the instrument panel. This will allow sufficient room to remove the junction block from under the instrument panel.
7. Working through the steering column opening cover, remove the three bulkhead and two body controller electrical connectors from the junction block assembly.
8. Detach instrument panel wire harness from the lower channel on the instrument panel. This will allow sufficient room to remove the junction block from under the instrument panel.
9. Remove the four junction block retaining screws and remove the junction block from under the instrument panel.

Note. On vehicles equipped with manual transmission, it will be helpful to depress the clutch pedal when installing the junction block under the instrument panel.

1. Position the junction block and install the four junction block retaining screws.
2. Install instrument panel wire harness on the lower channel of the instrument panel.
3. Working through the steering column opening cover, install the three bulkhead and two body controller electrical connectors on the junction block assembly.
4. Install the courtesy lamp under the left side of the instrument panel.
5. Install the left cowl trim panel on the vehicle.
6. Install the steering column opening cover. See «STEERING COLUMN»(ref-174913) .
7. Install the left end cap on the instrument panel.
8. Connect the negative battery cable.