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Home >> Chevrolet >> 2022 >> Tahoe PPV, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Vehicle Access - Diagnostic Information And Procedures (2 Of 2) >> Diagnostic Information and Procedures >> Liftgate System Diagnosis >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify the K194 Rear Gate Module is programmed with the latest and correct software.
    • If the software is not the latest or is not the correct software 

      Refer to Control Module References for rear gate module replacement, programming and setup.

    • Go to next step: If the software is the latest and is correct 
  3. Verify the K194 Rear Gate Module does not have any current DTCs set.
    • Go to next step: If the K194 Rear Gate Module does not have any current DTCs set 
  4. Verify DTC B16C5 or B1576 is not set as a history DTC.
    • Go to next step: If the K194 Rear Gate Module does not have any history DTCs set 
  5. Liftgate Closed, verify the scan tool Rear Gate Latch Unlatch Switch, Rear Gate Latch Primary Switch, and Rear Gate Latch Neutral Switch parameters are as listed below:
    • Rear Gate Latch Unlatch Switch parameter Inactive
    • Rear Gate Latch Primary Switch parameter Inactive
    • Rear Gate Latch Neutral Switch parameter Inactive
    • Go to next step: If the parameters are as listed 
  6. Ignition ON, verify the liftgate will unlatch and power open while pressing the appropriate button on the keyless entry transmitter twice.
    • Go to next step: If the liftgate does release and power open 
  7. Liftgate Open, verify the scan tool parameter Rear Gate Travel is greater than 70%
    • Go to next step: If greater than the specified value 
  8. Liftgate Open, verify that the liftgate will remain at or near the full open position and does not slowly close.
    • Go to next step: If the liftgate remains in the full open position 
  9. Liftgate Open, verify the scan tool Rear Gate Anti-pinch Sensor Raw Voltage parameter is between 3 V-3.5 V.
    • Go to next step: If between 3 V-3.5 V 
  10. Liftgate Open, verify the scan tool Rear Gate Latch Unlatch Switch, Rear Gate Latch Primary Switch, and Rear Gate Latch Neutral Switch parameters are as listed below:
    • Rear Gate Latch Unlatch Switch Status parameter Active
    • Rear Gate Latch Primary Switch Status parameter Active
    • Rear Gate Latch Neutral Switch Status parameter Inactive
    • Go to next step: If the parameters are as listed 
  11. Verify the scan tool Rear Gate Close Switch parameter changes between Active and Inactive when pressing the B70 Liftgate Close Switch.
    • Go to next step: If the parameter changes 
  12. Verify the liftgate will perform the power open function when pressing the S45A Liftgate Release Switch - Exterior.
    • Go to next step: If the liftgate does power open 
  13. Verify the liftgate will perform the power open function when pressing the S45 Liftgate Control Switch.
    • Go to next step: If the liftgate does power open 
  14. Set the S45B Liftgate Control Switch-Interior to the 3/4 mode.
  15. Command the power liftgate to open by pressing the S45 Liftgate Control Switch.

    Verify the liftgate performs the power open function and stops at the garage mode position.

    • Go to next step: If the liftgate performs the power open function and stops at the garage mode position. 
    16. NOTE:

    Refer to the owner's manual for the location of the kick sensors prior to performing the kicking motion

  16. If equipped, liftgate Closed, with the keyless entry transmitter within 3 feet (1 meter) of the liftgate, activate the rear closure hands free release system with a kicking motion of a foot under the rear fascia. The tail lamps will flash 3 times if the rear closure hands free sensors detect the motion.
    • Go to next step: If the tail lamps flash 
  17. All OK.
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