Power Top System Pre-Diagnostic Procedure

POWER TOP SYSTEM PRE-DIAGNOSTIC PROCEDURE

Before attempting to repair any power top system, technicians should be familiar with and fully understand the system operation. Power Top - Description for complete details on the power top system. The following should be used as a checklist to be completed in its entirety prior to referencing specific Convertible Power Top diagnostic procedures. Read and perform the following in its entirety before continuing with diagnostics.

FOLLOW THE BASIC OUTLINE SET FORTH IN THE SIX-STEP TROUBLESHOOTING PROCEDURE

1. Verification of complaint.
2. Verification of any related symptoms.
3. Symptom analysis.
4. Problem isolation.
5. Repair of isolated problem.
6. Verification of proper operation.

TAKE INTO ACCOUNT CURRENT VEHICLE CONDITION, REPAIR HISTORY, AND TECHNICAL SERVICE BULLETINS (TSBs)

- Verify there are no outward signs of vehicle damage that could impact the proper operation of the theft or security system. Check for aftermarket vehicle accessories that may have been installed improperly or could interfere with the system
- Check the vehicle repair history for repairs that may relate to the current condition.
- Perform a check of current Technical Service Bulletins (TSB) for the Power Top (Convertible) system related to the customer concern. If a TSB applies, follow the procedure outlined in the TSB.

INTERMITTENT FAILURES
- For an intermittent failure that is not current at the time of vehicle inspection, Power Top Diagnostics and document the event on the repair order.

ADDRESS ACTIVE DIAGNOSTIC TROUBLE CODES (DTCS) IN THE CORRECT ORDER
As a general rule, for any power top convertible control module that exhibits more than one active DTC, address the codes in the order indicated:

1. Low/High Voltage and Serial Data Loss of Communication Codes
2. Module Internal Failure and Configuration Mismatch Codes
3. Circuit specific DTC failures

Should the malfunction still be present after conducting this Pre-diagnostic Procedure, technicians should continue to the appropriate DTC procedure or symptom diagnostic. Testing and Inspection for Diagnostic Trouble Codes or Power Top Diagnostics for symptom based diagnostics.

PRE-TESTING SYSTEM CHECKS
Check each of the following items to be sure they are functioning properly. Any of the following could cause improper power top operation:

1. Start the engine to make sure there is proper battery voltage. Battery voltage must be above 10.6 volts.
2. Check fuse numbers 1, 24 and 37 in the TIPM. If necessary, replace the fuse and diagnose the condition that caused the fuse to blow. Refer to the wiring diagrams and the Service Information.
3. Check the rear cargo compartment divider to make sure it is unfolded and secured in the vertical position. If the divider is in its stowed position first unfold the panels towards the rear of the vehicle. Pull up on the vertical panel using the center cutout, and hook the pins at the top into the slots molded into the cargo compartment trim on each side near the forward edge of the decklid opening. The pins MUST be hooked in these slots in order for the top to operate.
4. Check to make sure the deck lid is closed and latched.
5. Using the scan tool, in the PTCM Data Display, check the Power Top Pre-conditions for the proper conditions required for Power Top operation.