Body - Convertible Top Inoperative
61 Convertible top inoperative61 12 16
2029956/1
July 6, 2012.
Affected Vehicles
Condition
Convertible top is inoperative. The following conditions are present:
^ All switches and sensors check OK
^ Convertible top movement ceases
^ Convertible top operation has not ceased due to overheat protection
^ All operating conditions have been met per MVBs 002, 003 and 004 (e.g. windows are initialized, battery voltage is OK, trunk lid is fully closed and latched, etc.)
^ Convertible Top Operation Switch E137 is actuated
^ The hydraulic pump drive motor may or may not continue to run
Technical Background
Loss of convertible top operation may be due to a faulty hydraulic pump drive motor.
Production Solution
Improved hydraulic pump drive motor.
Service
One or more DTCs may be stored in 26 - Convertible Top Operation control unit J256. Perform a Guided Fault Finding test plan to address any possible malfunction with the sensors or microswitches by performing the five position test. If, after all switches and sensors have been diagnosed as having no problem, continue the diagnosis for possible loss of hydraulic pressure. Actuate Convertible Top Operation Switch E137 and listen for the hydraulic pump drive motor. If the motor continues to run there is no need to test the drive motor itself. If the drive motor does not continue to run, perform output diagnostic test mode for Convertible Top Hydraulic Pump Relay J321 and Convertible Top Hydraulic Pump Relay 2 J588. Check for suitable voltage and ground at the drive motor during relay activation. If voltage and ground are checked and OK and the drive motor does not activate, the pump drive motor is faulty. If the drive motor is faulty, it is available as a replacement part without having to replace the entire hydraulic pump assembly. In these cases only replace the drive motor and pump lever.
Only replace the hydraulic pump assembly if the root cause of the failure is not merely the drive motor.
Warranty
Required Parts and Tools
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.