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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Body Control Module (BCM) - DTCS B226A-00 To U1493-00 - 500 - Electric) >> DTC Troubleshooting >> B25B5-23-External Trunk Switch - Signal Stuck Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. TEST FOR INTERMITTENT CONDITION 
    1. Turn the ignition on.
    2. With the scan tool, record and erase the DTCs.
    3. Try to open and close the trunk (liftgate) several times.
    4. Wait 30 seconds.
    5. With the scan tool, read the active DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      • Go To  2

      No 

      • Test complete. The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  2. LIFTGATE RELEASE SWITCH 
    1. Check the Liftgate Release Switch for anything that may cause a sticking condition. Repair if necessary and re-check the DTC. If okay, continue testing.
    2. With the scan tool, erase the DTCs.
    3. Disconnect the Liftgate Release Switch connector.
      NOTE:

      The Liftgate Release Switch is in the License Lamp Bar Exterior Handle. Refer to LAMP BAR, EXTERIOR HANDLE, REMOVAL .

    4. Turn the ignition off.
    5. Wait 30 seconds.
    6. Turn the ignition on.
    7. With the scan tool, read the active DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      • Go To  3

      No 

  3. (P30) LIFTGATE RELEASE SWITCH SENSE CIRCUIT SHORT TO GROUND 
    1. With the scan tool, erase the DTCs.
    2. Turn the ignition off.
    3. Disconnect the Body Control Module C2 harness connector.
    4. Measure the resistance between ground and the (P30) Liftgate Release Switch Sense circuit in the Liftgate Release Switch Sense connector.

      Is the resistance below 10K Ohms?

      Yes 

      • Repair the short to ground in the (P30) Liftgate Release Switch Sense circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No