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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 132 (Power Top - Convertible (Service Information)) >> Assembly-Motor/Hydraulic Pump >> Diagnosis And Testing >> Hydraulic Pump/Motor Assembly

Hydraulic Pump/Motor Assembly

WARNING: This page is about a different car, the 2006 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

Any diagnosis of the power top system should begin with the use of a scan tool and the proper Diagnostic Procedures Information. The scan tool can provide confirmation that the Controller Area Network (CAN) data bus is functional, that all of the electronic modules are sending and receiving the proper messages on the CAN data bus, and that the power top motor is being sent the proper hard wired output by the driver window regulator module.

NOTE: The convertible top system is equipped with a hydraulic bypass screw that is used to relieve pressure from the hydraulic system in the event that the top must be manually raised or lowered (such as a low battery or a convertible top operating concern). Always verify that the bypass screw is tight in the pump housing prior to replacing a hydraulic pump/motor assembly (Refer to BODY/CONVERTIBLE TOP - STANDARD PROCEDURE - BYPASS SCREW-HYDRAULIC PUMP) .

If the power top is completely inoperative and the hydraulic pump/motor assembly is suspect, perform the following:

Fig 1: Motor/Hydraulic Pump Assembly
GC0022972Courtesy of DAIMLERCHRYSLER CORP.
  1. Disconnect and isolate the negative battery cable.
  2. Remove the rear seat back (Refer to BODY/SEATS/SEAT BACK - REMOVAL) .
  3. Remove the well liner/carpet from the power top well.
  4. Remove the cover from the hydraulic pump/motor assembly.
  5. Disconnect the wire harness connector (1).
  6. Reconnect the negative battery cable.
  7. Insert a 12V test light between the two connector terminals of the hydraulic pump/motor wire harness connector.
  8. With the ignition in the "RUN" position, operate the power top in both directions while observing the test light. The light should illuminate in both directions. If OK, replace the hydraulic pump/motor assembly (Refer to BODY/CONVERTIBLE TOP/ASSEMBLY-PUMP/MOTOR - REMOVAL) . If not OK, use a scan tool and the proper Diagnostic Procedures Information to complete diagnosis of the power top system.
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