Diagnostic Test

DTC PRESENT
1. With the scan tool, record and erase DTCs.
2. Turn the ignition off, wait 10 seconds, then turn the ignition on.
3. Operate the Power Liftgate several times from stop to stop if possible.
4. With the scan tool, read ACTIVE DTCs.
  Does the scan tool display B1969-POWER LIFTGATE OPEN DIRECTION EXCESSIVE POSITION SENSOR COUNTS?
  
  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 conditions.
  - 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, 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.
  Were there any mechanical problems found?
  
  Yes
  - Refer to Service information for the related symptom(s).
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3.
POWER LIFTGATE MODULE - POSITION SENSE OPEN
1. Operate the liftgate from the full closed position and put an obstacle in its path to make it reverse.
  Did the liftgate reverse back to the closed position?
  
  Yes
  - Go To 4.
  No
  - Replace the Power Liftgate Module in accordance with the service information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z910) GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE

Fig 1: Checking Ground Circuit For Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Power Liftgate Drive Unit harness connector.
3. Measure the resistance of the (Z910) Ground circuit to ground.
4. Wiggle the harness and check for an intermittent open condition.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Go To 5.
  No
  - Repair the (Z910) Ground circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Q901) LOGIC GROUND FOR AN OPEN

Fig 2: Checking Logic Ground Circuit For Open
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (Z910) Ground and the (Q901) Logic Ground circuit in the Power Liftgate Drive Unit connector.
2. Wiggle the harness and check for an intermittent open condition.
  Is the resistance below two Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the (Q901) Logic Ground circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(Q51) FULL OPEN SWITCH CIRCUIT OPEN

Fig 3: Checking Full Open Switch Circuit For Open
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the Power Liftgate Module C1 harness connector.
2. Measure the resistance of the (Q51) Full Open Switch circuit between the Power Liftgate Drive Unit connector and the Power Liftgate Module C1 connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 7.
  No
  - Repair the (Q51) Full Open Switch circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(Q51) LIFTGATE FULL OPEN SWITCH SENSE CIRCUIT SHORTED TO GROUND

Fig 4: Checking Liftgate Full Open Switch Sense Circuit For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between Ground and the (Q51) Full Open Switch circuit.
  Is the resistance below 1, 000 Ohms?
  
  Yes
  - Repair the (Q51) Full Open Switch circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Power Liftgate Drive Unit in accordance with Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .