Diagnostic Test

WARNING: This page is about a different car, the 2012 Dodge Durango. However, it is still accessible from the selected car via links, so may be relevant.

DTC PRESENT
1. With the scan tool, record and erase the DTCs.
2. Turn the ignition off, wait 10 seconds, then turn the ignition on.
3. If possible, operate the liftgate several times.
4. With the scan tool, read the Active DTCs.
  Does the scan tool display; B188C-11-LIFTGATE CONTROL CIRCUIT 1 - CIRCUIT SHORT TO GROUND?
  
  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 .
(Q88) LIFTGATE OPEN DRIVER CIRCUIT SHORTED TO GROUND

Fig 1: Checking Liftgate Open Driver Circuit For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Power Liftgate Module C1 harness connector.
3. Measure the resistance between ground and the (Q88) Liftgate Open Driver circuit.
  Is the resistance below 1, 000 Ohms?
  
  Yes
  - Go To 4.
  No
  - Go To 3.
(Q88) LIFTGATE OPEN DRIVER CIRCUIT SHORTED TO THE (Q89) LIFTGATE CLOSE DRIVER CIRCUIT

Fig 2: Checking Liftgate Open Driver Circuit For Short To Liftgate Close Driver Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (Q88) Liftgate Open Driver circuit and the (Q89) Liftgate Close Driver circuit.
  NOTE:
  Be sure to use an accurate DVOM in the following step. Zero the meter before beginning.
  
  Is the resistance below 0.35 of an Ohm (should be approximately 0.5 of an Ohm)?
  
  Yes
  - Go To 6.
  No
  - Replace the Power Liftgate Module in accordance with service information. Refer to MODULE, POWER LIFTGATE CONTROL, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(Q88) LIFTGATE OPEN DRIVER WIRE SHORTED TO GROUND

Fig 3: Checking Liftgate Open Driver Circuit For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the Power Liftgate Drive Unit connector.
2. Measure the resistance between ground and the (Q88) Liftgate Open Driver circuit.
  Is the resistance below 1, 000 Ohms?
  
  Yes
  - Repair the (Q88) Liftgate Open Driver circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 5.
(Q89) LIFTGATE CLOSE DRIVER WIRE SHORTED TO GROUND

Fig 4: Checking Liftgate Close Driver Wire For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the (Q89) Liftgate Close Driver circuit in the Power Liftgate Module C1 connector.
  Is the resistance below 1, 000 Ohms?
  
  Yes
  - Repair the (Q89) Liftgate Close Driver 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 the Service Information. Refer to DRIVE UNIT, POWER, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(Q88) LIFTGATE OPEN DRIVER WIRE SHORTED TO THE (Q89) LIFTGATE CLOSE DRIVER WIRE

Fig 5: Checking Liftgate Open Driver Wire For Short To Liftgate Close Driver Wire
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the Power Liftgate Drive Unit harness connector.
2. Measure the resistance between the (Q88) Liftgate Open Driver circuit and the (Q89) Liftgate Close Driver circuit.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the (Q88) Liftgate Open Driver circuit for a short to the (Q89) Liftgate Close Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Power Liftgate Drive Unit in accordance with the Service Information. Refer to DRIVE UNIT, POWER, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .