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Incomplete Power Open - Excessive H.E. Counts/Non Engagement

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. With the DRBIII®, record and erase DTC's. Turn the ignition off, wait 10 seconds, then turn the ignition on. Operate the Power Liftgate several times from stop to stop if possible. With the DRBIII®, read ACTIVE DTCs. If the DRBIII® displays INCOMPLETE POWER OPEN - EXCESSIVE H.E. COUNTS/NON ENGAGEMENT, go to the next step. If the DRBIII® does not display INCOMPLETE POWER OPEN - EXCESSIVE H.E. COUNTS/NON ENGAGEMENT, inspect the wiring and connectors for an intermittent condition. Operate the liftgate several times and check for any binding conditions.
  2. Examine the Liftgate for proper alignment, worn or binding hinges, weak liftgate prop assembly, loose/hard weatherstrip, and gear teeth on the Power Liftgate Motor assembly for wear or anything that would cause an obstruction to proper operation. If necessary manually operate the power liftgate on a known good vehicle and notice the effort needed to open and close for comparison. Especially notice the effort needed to unlatch and close the liftgate. If there are any mechanical problems found, see POWER SLIDING DOORS & LIFTGATE article. If there are no problems found, go to the next step.
  3. Operate the liftgate from the full closed position and put an obstacle in it's path to make it reverse. If the door reversed back to the closed position, go to the next step. If the door did not reverse back to the closed position, replace the Power Liftgate Module. See under POWER LIFTGATE MODULE  REMOVAL & INSTALLATION.
  4. Disconnect the Power Liftgate Module C2 connector. See Figure. Measure the resistance between the Liftgate Gear Engage Driver circuit and the Liftgate Gear Disengage Driver circuit in the PLG Module connector. If the resistance is below 5 ohms, go to the next step. If the resistance is between 5.1 and 8 ohms, go to step  7. If the resistance is above 8.1 ohms, go to step  12.
  5. Disconnect the Power Liftgate Motor connector. See Fig 1. Disconnect the Power Liftgate Control Module C2 connector. See Figure. Measure the resistance between the Liftgate Gear Engage Driver circuit and the Liftgate Gear Disengage Driver circuit in the PLG Module connector. If the resistance is below 10000 ohms, repair the Liftgate Gear Engage Driver wire for a short to the Liftgate Gear Disengage Driver wire. If the resistance is above 10000 ohms, go to the next step.
  6. If there are no possible causes remaining, replace the Power Liftgate Motor Assembly. See POWER SLIDING DOORS & LIFTGATE article.
  7. Disconnect the Power Liftgate Module C2 connector. See Figure. Measure the resistance between Ground and the Liftgate Gear Engage Driver circuit. If the resistance is below 10000 ohms, go to the next step. If the resistance is above 10000 ohms, go to step  11.
  8. Disconnect the Power Liftgate Motor connector. See Fig 1. Disconnect the Power Liftgate Module C2 connector. See Figure. Measure the resistance between ground and the Liftgate Gear Engage Driver circuit. If the resistance is below 10,000 ohms, repair the Liftgate Gear Engage Driver wire for a short to ground. If the resistance is above 10,000 ohms, go to the next step.
  9. Disconnect the Power Liftgate Motor connector. See Fig 1. Disconnect the Power Liftgate Module C2 connector. See Figure. Measure the resistance between ground and the Liftgate Gear Disengage Driver circuit. If the resistance is below 10,000 ohms, repair the Liftgate Gear Disengage Driver wire for a short to ground. If the resistance is above 10,000 ohms, go to the next step.
  10. If there are no possible causes remaining, replace the Power Liftgate Motor Assembly. See POWER SLIDING DOORS & LIFTGATE article.
    11. NOTE: Ensure all connectors are connected before proceeding.
  11. While back probing, measure the voltage between the Liftgate Gear Engage Driver circuit and the Liftgate Gear Disengage Driver circuit at the PLG Module connector. See Figure. Operate the Power liftgate and observe the voltmeter. If the voltmeter reads above 11 volts for at least 1 second while the liftgate was operating, replace the Power Liftgate Motor assembly. See POWER SLIDING DOORS & LIFTGATE article. If the voltmeter does not read above 11 volts for at least 1 second while the liftgate was operating, replace the Power Liftgate Module. See POWER LIFTGATE MODULE  under REMOVAL & INSTALLATION.
  12. Disconnect the power Liftgate Motor connector. See Fig 1. Disconnect the Power Liftgate Module C2 connector. See Figure. Measure the resistance of the Liftgate Gear Engage Driver circuit between the Power Liftgate Motor connector and the Power Liftgate Module C2 connector. If the resistance is below 5 ohms, go to the next step. If the resistance is above 5 ohms, repair the Liftgate Gear Engage Driver wire for an open.
  13. Disconnect the Power Liftgate Motor connector. See Fig 1. Disconnect the Power Liftgate Module C2 connector. See Figure. Measure the resistance of Liftgate Gear Disengage Driver circuit from the Motor connector to the PLG Module connector. If the resistance is below 5 ohms, go to the next step. If the resistance is above 5 ohms, repair the Liftgate Gear Disengage Driver wire for an open.
  14. If there are no possible causes remaining, replace the Power Liftgate Motor Assembly. See POWER SLIDING DOORS & LIFTGATE article.
Fig 1: Identifying Power Liftgate Motor Connector
G00172176Courtesy of DAIMLERCHRYSLER CORP.
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