Diagnostic Test

DIAGNOSTIC TROUBLE CODE (DTC) PRESENT
1. Using the scan tool, record DTCs.
2. Erase DTCs.
3. Turn the ignition off, wait 10 seconds, then turn the ignition on.
4. If possible, operate the liftgate several times.
5. Using the scan tool, read DTCs.
  Does the scan tool display B1891-POWER LIFTGATE CONTROL CIRCUIT 2 LOW?
  
  Yes
  - Go to step 2
  No
  - Using the SYSTEM WIRING DIAGRAMS as a guide, inspect the wiring and connectors for an intermittent condition.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(Q89) LIFTGATE CLOSE DRIVER CIRCUIT SHORTED TO THE (Q88) LIFTGATE OPEN DRIVER CIRCUIT

Fig 1: Checking Liftgate Open Driver Circuit Shorted To Liftgate Close Driver Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Power Liftgate Module C1 harness connector.
3. Measure the resistance between the (Q89) Liftgate Close Driver circuit and the (Q88) Liftgate Open Driver circuit
  Is the resistance below 3.0 Ohms (should be approximately 4.3 Ohms)?
  
  Yes
  - Go to step 3
  No
  - Go to step 4
POWER LIFTGATE DRIVE UNIT

Fig 2: Checking Power Liftgate Drive Unit
Courtesy of CHRYSLER LLC
1. Disconnect the Power Liftgate Drive Unit harness connector.
2. Measure the resistance between the (Q89) Liftgate Close Driver circuit and the (Q88) Liftgate Open Driver circuit.
  Is the resistance below 1, 000 Ohms?
  
  Yes
  - Repair the (Q89) Liftgate Close Driver circuit for a short to the (Q88) Liftgate Open Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace the Power Liftgate Driver Unit in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(Q89) LIFTGATE CLOSE DRIVER CIRCUIT SHORTED TO GROUND

Fig 3: Checking Liftgate Close Driver For A Short To Ground
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (Q89) Liftgate Close Driver circuit.
  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 DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 5
(Q88) LIFTGATE OPEN DRIVER CIRCUIT SHORTED TO GROUND

Fig 4: Checking Liftgate Open Driver Circuit Shorted To Ground
Courtesy of CHRYSLER LLC
1. Reconnect the Power Liftgate Module C1 harness connector.
2. Measure the resistance between ground and the (Q88) Liftgate Open Driver circuit.
  Is the resistance above 1, 000 Ohms?
  
  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 .
  No
  - Repair the (Q88) Liftgate Open Driver circuit for a short to ground. If the (Q88) Liftgate Open Driver is OK, 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 .