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Home >> Jeep >> 2007 >> Commander Base, 4.7 P, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Power Liftgate System - Electrical Diagnostics >> Power Liftgate - Electrical Diagnostics >> DTC Troubleshooting >> B197B-Power Liftgate Open Direction - Pawl Switch Performance >> Diagnostic Test

Diagnostic Test

  1. 1) DTC PRESENT 

    With the scan tool, record and erase DTCs.

    Turn the ignition off, wait 10 seconds, then turn the ignition on.

    Operate the power liftgate several times if possible.

    With the scan tool, read ACTIVE DTCs.

    Does the scan tool display B197B-POWER LIFTGATE OPEN DIRECTION - PAWL SWITCH PERFORMANCE? 

    Yes 

    1. Go to  2).

    No 

    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition. Operate the door several times and check for any binding or other obstructions.
    2. Perform BODY VERIFICATION TEST .
  2. 2) BINDING LIFTGATE 

    Examine the liftgate for proper fit and alignment, loose/hard or torn seals, misaligned latch striker or anything that would cause an obstruction to proper operation.

    Manually operate the liftgate of a known good vehicle and notice the effort needed to open and close.

    Compare the effort needed on the disabled liftgate.

    Especially notice the effort needed to unlatch and close the liftgate.

    Does it take more effort to operate the liftgate than it should? 

    Yes 

    1. Refer to Service information for the related symptom(s).
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Go to  3).
  3. 3) (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT SHORT TO GROUND 
    Fig 1: Measuring Resistance Between Ground And Liftgate Latch Release Driver Circuit
    GC0044207Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (Q85) Liftgate Latch Release Driver circuit.

    Wiggle the harness and check for an intermittent short condition.

    Is the resistance below 1000.0 ohms? 

    No 

    1. Go to  4).

    Yes 

    1. Repair the (Q85) Liftgate Latch Release Driver circuit for a short to ground.
    2. Perform BODY VERIFICATION TEST .
  4. 4) CHECK THE (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT AND THE (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 2: Measuring Voltage Of Lift Gate Latch Driver Circuits
    GC0057988Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Power Liftgate Module C2 harness connector.

    Disconnect the Power Liftgate Latch harness connector.

    Turn the ignition on.

    Measure the voltage of the (Q84) Liftgate Latch Cinch Driver circuit and the (Q85) Liftgate Latch Release Driver circuit.

    Is there any voltage present? 

    Yes 

    1. Repair the (Q84) Liftgate Latch Cinch Driver circuit or the (Q85) Liftgate Latch Release Driver circuit for a short to voltage.

    No 

    1. Go to  5).
  5. 5) (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO GROUND 
    Fig 3: Measuring Resistance Between Ground And Liftgate Latch Cinch Driver Circuit
    GC0044205Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (Q84) Liftgate Latch Cinch Driver circuit.

    Wiggle the harness and check for an intermittent short condition.

    Is the resistance below 1000.0 ohms? 

    No 

    1. Go to  6).

    Yes 

    1. Repair the (Q84) Liftgate Latch Cinch Driver circuit for a short to ground.
    2. Perform BODY VERIFICATION TEST .
  6. 6) CHECK THE (Q60) LIFTGATE PAWL SWITCH SENSE FOR A SHORT TO VOLTAGE 
    Fig 4: Measuring Voltage Between Logic Ground Circuit And Liftgate Pawl Switch Sense Circuit
    GC0044268Courtesy of CHRYSLER LLC

    Disconnect the Power Liftgate Latch harness connector.

    Measure the voltage between the (Q901) Logic Ground Circuit and the (Q60) Liftgate Pawl Switch Sense circuit.

    Wiggle the harness while observing the voltmeter.

    Is there any voltage present? 

    No 

    1. Go to  7).

    Yes 

    1. Repair the (Q60) Liftgate Pawl Switch Sense circuit for a short to.
    2. Perform BODY VERIFICATION TEST .
  7. 7) CHECK THE (Q901) LOGIC GROUND WIRE FOR AN OPEN 
    Fig 5: Measuring Resistance Of Logic Ground Circuit
    GC0044217Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Power Liftgate Module C2 harness connector.

    Measure the resistance of the (Q901) Logic Ground circuit between the Power Liftgate C2 harness connector and the Liftgate Latch harness connector.

    Wiggle the harness while observing the ohmmeter.

    Is the resistance below 2.0 ohms? 

    Yes 

    1. Go to  8).

    No 

    1. Repair the (Q901) Logic Ground circuit for an open.
    2. Perform BODY VERIFICATION TEST .
  8. 8) CHECK THE (Q60) LIFTGATE PAWL SWITCH SENSE CIRCUIT FOR AN OPEN 
    Fig 6: Measuring Resistance Of Liftgate Pawl Switch Sense Circuit
    GC0044267Courtesy of CHRYSLER LLC

    Measure the resistance of the (Q60) Liftgate Pawl Switch Sense circuit between the Power Liftgate C2 harness connector and the Power Liftgate Latch harness connector.

    Wiggle the harness while observing the ohmmeter.

    Is the resistance below 2.0 ohms? 

    Yes 

    1. Go to  9).

    No 

    1. Repair the (Q60) Liftgate Pawl Switch Sense circuit for an open.
    2. Perform BODY VERIFICATION TEST .
  9. 9) POWER LIFTGATE MODULE 

    With the scan tool under PLGM, monitor the PAWL SWITCH STATUS.

    Using a screwdriver, click the latch to the first detent while observing the scan tool.

    Unlatch the latch by pressing the handle switch and observe the scan tool for a change of state.

    Repeat this step several times while moving the liftgate in different positions and wiggling the harness to check for an intermittent open circuit.

    Did the scan tool show the switch state changing correctly every time? 

    Yes 

    1. Check the Power Liftgate Module and Power Liftgate Latch harness and connectors for damage, and repair as necessary. If the Power Liftgate Module and Power Liftgate Latch harness and connectors are OK, replace the Power Liftgate Module in accordance with the service information.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Replace the Power Liftgate Latch in accordance with the service information.
    2. Perform BODY VERIFICATION TEST .
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