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  • kiawah 02/02/08 8:33 am PST

    It could be a fuse, the switch, a relay, or ultimately the rear wiper motor is defective which blew out one of the above.

  • sandman235 02/09/08 10:03 am PST

    Got this from my 2000 Jeep Grand Cherokee service manual, hope it helps.
    REAR WIPER SYSTEM
    For complete circuit diagrams, refer to Wipers in
    the Contents of Group 8W - Wiring Diagrams.
    WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS,
    REFER TO GROUP 8M - PASSIVE
    RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
    STEERING WHEEL, STEERING COLUMN, OR
    INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
    SERVICE. FAILURE TO TAKE THE PROPER PRECAUTIONS
    COULD RESULT IN ACCIDENTAL AIRBAG
    DEPLOYMENT AND POSSIBLE PERSONAL
    INJURY.
    (1) Check that the interior lighting switch on the
    control stalk of the left multi-function switch is not
    in the dome lamp disable position. With all four
    doors and the liftgate closed, open the liftgate flip-up
    glass. The interior lamps should light. Close all four
    doors, the liftgate and the liftgate flip-up glass. Note
    whether the interior lamps remain lighted. They
    should turn off after about thirty seconds. If OK, go
    to Step 2. If not OK, go to Step 9.
    (2) Check the fused B(+) fuse in the junction block.
    If OK, go to Step 3. If not OK, repair the shorted circuit
    or component as required and replace the faulty
    fuse.
    (3) Check for battery voltage at the fused B(+) fuse
    in the junction block. If OK, go to Step 4. If not OK,
    repair the open fused B(+) circuit to the Power Distribution
    Center (PDC) fuse as required.
    (4) Check the fused ignition switch output (run/accessory)
    fuse in the junction block. If OK, go to Step
    5. If not OK, repair the shorted circuit or component
    as required and replace the faulty fuse.
    (5) Turn the ignition switch to the On position.
    Check for battery voltage at the fused ignition switch
    output (run/accessory) fuse in the junction block. If
    OK, turn the ignition switch to the Off position and
    go to Step 6. If not OK, repair the open fused ignition
    switch output (run/accessory) circuit to the ignition
    switch as required.
    (6) Disconnect and isolate the battery negative
    cable. Disconnect the instrument panel wire harness
    connector from the wiper and washer (right multifunction)
    switch connector receptacle. Reconnect the
    battery negative cable. Turn the ignition switch to
    the On position. Check for battery voltage at the
    fused ignition switch output (run/accessory) circuit
    cavity of the instrument panel wire harness connector
    for the wiper and washer switch. If OK, go to
    Step 7. If not OK, repair the open fused ignition
    switch output (run/accessory) circuit to the junction
    block fuse as required.
    (7) Turn the ignition switch to the Off position.
    Disconnect and isolate the battery negative cable.
    Refer to Wiper and Washer Switch in the Diagnosis
    and Testing section of this group. If the wiper and
    washer switch tests OK, reconnect the instrument
    panel wire harness connector to the wiper and
    washer switch connector receptacle and go to Step 8.
    If the wiper and washer switch does not test OK,
    replace the faulty wiper and washer switch.
    (8) Remove the liftgate inner trim panel. Disconnect
    the liftgate wire harness connector from the rear
    wiper motor module connector receptacle. Check for
    continuity between the ground circuit cavity of the
    liftgate wire harness connector for the rear wiper
    motor module and a good ground. There should be
    continuity. If OK, go to Step 9. If not OK, repair the
    open ground circuit to ground as required.
    (9) Check for continuity between the liftgate
    flip-up glass ajar switch sense circuit cavity of the
    liftgate wire harness connector for the rear wiper
    motor module and a good ground. There should be
    continuity with the liftgate flip-up glass open, and no
    continuity with the liftgate flip-up glass closed. If
    OK, go to Step 10. If not OK, repair the liftgate
    flip-up glass ajar circuit as required.
    (10) Reconnect the battery negative cable. Check
    for battery voltage at the fused B(+) circuit cavity of
    the liftgate wire harness connector for the rear wiper
    motor module. If OK, go to Step 11. If not OK, repair
    the open fused B(+) circuit to the junction block fuse
    as required.
    (11) Turn the ignition switch to the On position.
    Turn the rear wiper switch to the Delay position.
    Check for battery voltage at the rear wiper motor
    intermittent control circuit cavity of the liftgate wire
    harness connector for the rear wiper motor module.
    If OK, go to Step 12. If not OK, repair the open rear
    wiper motor intermittent control circuit to the wiper
    and washer switch as required.
    (12) Turn the rear wiper switch to the On position.
    Check for battery voltage at the rear wiper motor
    control circuit cavity of the liftgate wire harness connector
    for the rear wiper motor module. If OK,
    replace the faulty rear wiper motor module. If not
    OK, repair the open rear wiper motor control circuit
    to the wiper and washer switch as required

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