Incomplete Latch Release - Ratchet Switch Failure
NOTE:
This DTC will only set after door cinch operation after 4-second time-out function. Conditions to set DTC may be difficult to reproduce.
NOTE:
After making any repairs, perform BODY VERIFICATION TEST under VERIFICATION TESTS.
- Using scan tool, record and erase DTCs. Turn ignition off. Wait 10 seconds. Turn ignition on. Operate power liftgate several times if possible. Recheck for DTCs. If INCOMPLETE LATCH RELEASE - RATCHET SWITCH FAILURE resets, go to next step. If INCOMPLETE LATCH RELEASE - RATCHET SWITCH FAILURE does not reset, system is operating properly at this time. Check for intermittent poor connections or faulty circuits.
- Visually inspect liftgate for proper alignment, damaged strikers, damaged latches or obstructions. Repair as necessary. If possible, check operation of liftgate on a known-good vehicle. If liftgate effort is excessive, diagnose power liftgate by symptom. See TROUBLE SHOOTING in POWER SLIDING DOORS & LIFTGATE article. If liftgate effort is not excessive, go to next step.
- Using scan tool, select INPUTS/OUTPUTS and monitor RATCHET state. Open liftgate completely. Using a screwdriver, manually move liftgate cinch/release motor latch to second click (detent) while observing DVOM. Use liftgate release handle to open liftgate cinch/release motor latch. Repeat procedure several times while moving liftgate to different positions and wiggling wiring harness. If RATCHET SWITCH state does not change every time liftgate cinch/release motor latch is manually moved and released, go to next step. If RATCHET SWITCH state changes every time liftgate cinch/release motor latch is manually moved and released, replace Power Liftgate Module (PLGM). See POWER LIFTGATE MODULE under REMOVAL & INSTALLATION.
- Turn ignition off. Disconnect the Power Liftgate Module C2 connector. See Figure. Disconnect liftgate cinch/release motor connector. See Figure. Measure the resistance of the ground wire between the PLG C2 connector (cavity 20) and the liftgate cinch/release motor connector (cavity 1). Wiggle the harness while observing the ohmmeter. If the resistance is below 5 ohms, go to the next step. If the resistance is above 5 ohms, repair the ground wire for an open.
- Disconnect the Power Liftgate Module C2 connector. See Figure. Disconnect the Liftgate Cinch/Release Motor connector (latch assembly). See Figure. Measure the resistance of the Liftgate Ajar Switch Sense wire between the PLG C2 connector and the Liftgate Cinch/Release Motor connector. Wiggle the harness and move the liftgate in different positions while observing the ohmmeter. If the resistance is below 5 ohms, go to the next step. If the resistance is above 5 ohms, repair the Liftgate Ajar Switch Sense wire for an open.
- If there are no possible causes remaining, replace the Ratchet Switch (latch assembly). See REMOVAL & INSTALLATION in POWER SLIDING DOORS & LIFTGATE article.