Grand Cherokee 2WD L6-4.0L VIN S (1997)
Power Seat Motor: Adjustments
Power Recliner Adjuster and Motor
SYSTEM OPERATION
The power recliner adjuster uses a reversible motor to operate the seat back recliner adjuster. The motor is connected to a gearbox that moves the
recliner adjuster through a screw-type drive unit.
When the power recliner switch is actuated, a battery feed and a ground path are applied through the switch contacts to the motor. The motor
operates to move the seat back in the selected direction until the switch is released, or until the travel limit of the power recliner adjuster is
reached. When the switch is moved in the opposite direction, the battery feed and ground paths to the motor are reversed through the switch
contacts. This causes the motor to run in the opposite direction.
The motor contains a self-resetting circuit breaker to protect it from overload. Consecutive or frequent resetting of the circuit breaker must not be
allowed to continue, or the motor may be damaged. Make the necessary repairs. The motor used on models with the optional memory system also
has a position potentiometer included in the motor assembly.
The power recliner adjuster and motor cannot be repaired, and is serviced only as a complete unit. If any component in this unit is faulty or
damaged, the entire power recliner adjuster and motor assembly must be replaced.
DIAGNOSIS AND TESTING
The tests below apply to a power seat system without the memory system option. For testing of the power seats with the memory system, refer to
the proper Computers and Control Systems/Body Control Module/Testing and Inspection Procedures.
Operate the power seat switch to move the power recliner in each direction. The recliner should move in both directions. If the power recliner fails
to operate in only one direction, move the seat a short distance in the opposite direction and test again to be certain the adjuster is not at its travel
limit. If the power recliner still fails to operate in only one direction, see the diagnosis for the Power Seat Switch. If the power recliner fails to
operate in either direction, proceed as follows:
1. Test the circuit breaker in the junction block as described. If OK, go to Step 2. If not OK, replace the faulty circuit breaker.
2. Remove the power seat switch as described. Check for battery voltage at the fused B(+) circuit cavity of the switch wire harness connector. If
OK, go to Step 3. If not OK, repair the open circuit to the junction block as required.
3. Check for continuity between the ground circuit cavity of the switch wire harness connector and a good ground. There should be continuity. If
OK, go to Step 4. If not OK, repair the open circuit to ground as required.
4. Test the power seat switch as described. If the switch tests OK, check the wire harness for the power recliner between the switch and the motor
for shorts or opens. If the circuits check OK, replace the faulty power recliner adjuster and motor assembly. If the circuits are not OK, repair
the wire harness as required.
