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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 497 (Power Top Control Module ( PTCM) - Electrical Diagnostics) >> DTC Troubleshooting >> B253D-Convertible Top Header Unlatch Limit Switch Performance >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2013 Dodge Avenger and 2013 Chrysler 200. However, it is still accessible from the selected car via links, so may be relevant.
  1. TEST FOR INTERMITTENT CONDITION 
    NOTE:

    The PTCM will only set this fault code when the top operation times out. Maximum timeout is 30 seconds.

    1. Turn the ignition on.
    2. With the scan tool, record and erase all PTCM DTCs.
    3. Try to operate the Power Top Switch in the open direction for a minimum of 30 seconds.
    4. Try to operate the Power Top Switch in the closed direction for a minimum of 30 seconds.
    5. With the scan tool, read all PTCM DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      • Go To  2

      No 

      • The condition that caused this symptom is currently not present. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  2. (Q978) HEADER UNLATCHED LIMIT SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Checking Header Unlatched Limit Switch Signal Circuit For Short To Voltage
    GC0123764Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the PTCM C1 harness connector.
    3. Disconnect the Header Unlatched Limit Switch harness connector.
    4. Turn the ignition on.
    5. Measure the voltage of the (Q978) Header Unlatched Limit Switch Signal circuit in the Header Unlatched Limit Switch harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (Q978) Header Unlatched Limit Switch Signal circuit for a short to voltage.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  3
  3. (Q978) HEADER UNLATCHED LIMIT SWITCH SIGNAL CIRCUIT OPEN 
    Fig 2: Checking Header Unlatched Limit Switch Signal Circuit For Open
    GC0123765Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Measure the resistance of the (Q978) Header Unlatched Limit Switch Signal circuit between the PTCM C1 harness connector and the Header Unlatched Limit Switch harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the (Q978) Roof Header Limit Switch Unlatch Signal circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  4. (Z907) GROUND CIRCUIT OPEN 
    Fig 3: Checking Ground Circuit For Open
    GC0123766Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between ground and the (Z907) Ground circuit at the Header Unlatched Limit Switch harness connector.

      Is the resistance below 20.0 Ohms?

      Yes 

      • Replace the Power Top Control Module (PTCM) in accordance with the service information.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Repair the (Z907) Ground circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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