Diagnostic Test

WARNING: This page is about a different car, the 2016 Dodge Durango. However, it is still accessible from the selected car via links, so may be relevant.

DTC PRESENT
NOTE:
If there are any other Power Liftgate DTCs present, repair them before proceeding with this test.
1. Make sure the liftgate is closed and with the scan tool, run the "Latch Home Position Test" before proceeding to ensure the latch is positioned correctly.
2. With the scan tool, record and erase the DTCs.
3. Cycle the ignition off, wait 10 seconds, then cycle the ignition on.
4. Operate the power liftgate several times if possible.
5. With the scan tool, read the Active DTCs.
  Does the scan tool display; B1955-00-POWER LIFTGATE LATCH RELEASE OVERCURRENT?
  
  Yes
  - Go To 2.
  No
  - Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition. Operate the liftgate several times and check for any binding or other obstructions.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
BINDING LIFTGATE
1. Examine the liftgate for proper alignment, worn or binding hinges, weak liftgate prop assembly, loose/hard weatherstrip, and track assembly for wear or anything that would cause an obstruction to proper operation.
2. If necessary manually operate the power liftgate on a known good vehicle and notice the effort needed to open and close for comparison.
3. Especially notice the effort needed to unlatch and close the liftgate.
  Were there any mechanical problems found?
  
  Yes
  - Refer to LIFTGATE, ADJUSTMENTS for the related symptom(s).
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3.
WEAK OR DETERIORATED LIFTGATE SEAL
1. Check the liftgate seal for proper resiliency.
2. If necessary manually open the liftgate of a known good vehicle and notice the springy "Pop-Off" effect that happens when the handle is first depressed.
  Is the liftgate seal in good condition?
  
  Yes
  - Go To 4.
  No
  - Replace the seal.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT AND THE (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: Checking Liftgate Latch Cinch Driver Circuit Or Liftgate Latch Release Driver Circuit For Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Cycle the ignition off.
2. Disconnect the Power Liftgate Module C2 harness connector.
3. Disconnect the Power Liftgate Latch harness connector.
4. Cycle the ignition on.
5. Measure the voltage between ground and the (Q84) Liftgate Latch Cinch Driver circuit.
6. Measure the voltage between ground and the (Q85) Liftgate Latch Release Driver circuit.
  Is there any voltage present in either or both circuits?
  
  Yes
  - Repair the (Q84) Liftgate Latch Cinch Driver circuit or the (Q85) Liftgate Latch Release Driver circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 5.
(Q76) LATCH SECONDARY POSITION SENSE CIRCUIT OPEN

Fig 2: Checking Latch Secondary Position Sense Circuit For Open
Courtesy of CHRYSLER GROUP, LLC
1. Cycle the ignition off.
2. Measure the resistance of the (Q76) Latch Secondary Position Sense circuit between the Power Liftgate Module C2 connector and the Power Liftgate Latch connector.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the (Q76) Latch Secondary Position Sense wire for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Q901) LOGIC GROUND CIRCUIT FOR AN OPEN

Fig 3: Checking Logic Ground Circuit For An Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (Q901) Logic Ground wire between the Power Liftgate Module C2 harness connector and the Power Liftgate Latch harness connector.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Go To 7.
  No
  - Repair the (Q901) Logic Ground circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (G78) LIFTGATE AJAR SWITCH SENSE CHECK FOR OPEN

Fig 4: Checking Liftgate Ajar Switch Sense Circuit For An Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (G78) Liftgate Ajar Switch Sense circuit between the Power Liftgate Module C2 connector and the Power Liftgate Latch connector.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Replace the Power Liftgate Latch assembly in accordance with the Service Information and using the scan tool, run the "Latch Home Sector Test". Refer to LATCH, LIFTGATE, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repair the (G78) Liftgate Ajar Switch Sense wire for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .