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 if possible.
4. With the scan tool, read ACTIVE DTCs.
  Does the scan tool display B196E-POWER LIFTGATE CLOSE DIRECTION - FULL OPEN SWITCH PERFORMANCE?
  
  Yes
  - Go to step 2
  No
  - Using the SYSTEM WIRING DIAGRAMS as a guide, inspect the wiring and connectors for an intermittent condition. Operate the liftgate several times and check for any binding or obstructions.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
OBSTRUCTION OR STICKING SWITCH
1. Examine the liftgate for proper fit and alignment, foreign material in the drive unit or anything that would cause an obstruction to proper operation of the Full Open Switch.
2. With the scan tool under PLGM, read the FULL OPEN SWITCH state.
3. Manually operate the liftgate while monitoring the scan tool.
  Does the switch status change smoothly as the liftgate is pulled down from the full open position?
  
  Yes
  - Go to step 3
  No
  - Go to step 4
(Q51) LIFTGATE FULL OPEN SWITCH SENSE CIRCUIT INTERMITTENT SHORT TO GROUND
CAUTION: Never operate the Power Liftgate Drive Unit with the link rod removed as it could damage the Drive Unit.
1. Gain access to the Power Liftgate Drive Unit harness connector.
2. Gain access to the Power Liftgate Module.
3. With the scan tool in Inputs/Outputs, read the FULL OPEN SWITCH state.
4. Ensure the link rod is connected at this time.
5. Manually open the liftgate to mid position.
6. While monitoring the scan tool, wiggle the wiring harness from the Power Liftgate Module to the Full Open Switch on the Power Liftgate Drive Unit assembly.
  Did the switch status ever change?
  
  Yes
  - Repair the (Q51) Liftgate Full Open Switch Sense circuit for an intermittent short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace the Power Liftgate Drive Unit in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
CHECK THE POWER LIFTGATE DRIVE UNIT - FULL OPEN SWITCH

Fig 1: Checking Power Liftgate Drive Unit Harness Connector
Courtesy of CHRYSLER LLC
1. Disconnect the Power Liftgate Drive Unit harness connector.
2. Measure the voltage between (Q51) Liftgate Full Open Switch Sense circuit and the (Q901) Sensor Ground circuit.
3. While measuring the voltage, wiggle the Power Liftgate Module to check for an intermittent short.
  Is the voltage constantly above 4.6 volts?
  
  Yes
  - Replace the Power Liftgate Drive Unit in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go To step 5
(Q51) LIFTGATE FULL OPEN SWITCH SENSE CIRCUIT SHORT TO GROUND

Fig 2: Checking Liftgate Full Open Switch Sense Circuit Shorted To Ground
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Power Liftgate Module C1 harness connector
3. Measure the resistance between Ground and the (Q51) Liftgate Full Open Switch Sense circuit in the Power Liftgate Drive Unit connector.
  Is the resistance below 1000.0 ohms?
  
  Yes
  - Repair the (Q51) Liftgate Full Open Switch Sense circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 6
(Q51) LIFTGATE FULL OPEN SWITCH SENSE CIRCUIT SHORT TO (Q901) LOGIC GROUND

Fig 3: Checking Liftgate Full Open Switch Sense Circuit Short To Logic Ground
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (Q51) Liftgate Full Open Switch sense circuit and the (Q901) Logic Ground circuit in the Power Liftgate Drive Unit harness connector.
  Is the resistance below 1000.0 ohms?
  
  Yes
  - Repair the (Q51) Liftgate Full Open Switch Sense circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 7
(Q901) LOGIC GROUND OPEN

Fig 4: Checking Logic Ground Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Power Liftgate Drive Unit connector.
3. Measure the resistance between the (Z800) Ground and the (Q901) Logic Ground circuit in the Power Liftgate Drive Unit connector.
  Is the resistance below 9.5 ohms?
  
  Yes
  - Go to step 8
  No
  - Repair the (Q901) Logic Ground circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(Q51) LIFTGATE FULL OPEN SWITCH SENSE CIRCUIT OPEN

Fig 5: Checking Liftgate Full Open Switch Sense Circuit Open
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (Q51) Liftgate Full Open Switch Sense circuit between the Power Liftgate Module C1 harness connector and the Power Liftgate Drive Unit harness connector.
2. Wiggle the wiring harness from the Power Liftgate Module to the Full Open Switch on the Power Liftgate Drive Unit assembly.
  Is the resistance below 5.0 ohms?
  
  No
  - Repair the (Q51) Liftgate Full Open Switch Sense circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  Yes
  - Replace the Power Liftgate Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .