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2007 > 2.7L V6 GASOLINE >
DIAGNOSIS AND TESTING - POWER TAILGATE SYSTEM
The power tailgate system is a complex system containing many components. In order to perform conclusive testing,
or receive outputs the power tailgate control module must be checked.
The most reliable, efficient, and accurate means to diagnose the power tailgate system requires the use of a scan tool
and the proper Body Diagnostic Procedures manual. The scan tool can be used to observe current switch status
recorded in the power tailgate control module to help the technician diagnose an inoperative switch.
Before any testing of the power tailgate system is attempted, the battery should be fully charged, all power tailgate
system inhibitors read and understood (Refer to power tailgate system description for list).
Following are quick reference diagnostic tables to help when diagnosing and testing the power tailgate system.
CONDITION
Tailgate opens unexpectedly
Tailgate will not power open
or close
Tailgate will not power open
or close
Power loss during Tailgate
operation
POSSIBLE CAUSES
Accidental activation or Failure of
open/close command switch
Failure of latch assembly
Failure of Power Tailgate or Body
Control module
Not in Park or false indication
Battery voltage at PTGM is too low
Blown fuse
Gas strut failure
BCM or tailgate control module critical
fault codes
Failure of latch assembly
Failure of motor assembly
Binding or sticking of components
Wiring problems (system or vehicle)
Wiring problems (system or vehicle)
Battery voltage at PTGM is too low
Failure of Power Tailgate or Body
Control Module
Failure of motor assembly
Failure of latch assembly
CORRECTION
Check for shorted or defective switch
Check wiring connections
Check for trouble codes, replace latch if
necessary
Disconnect then reconnect battery or fuse to
reset module, function tailgate, if no function
exists check for loose wire connections, see
Body Diagnostic Manual for detailed
procedures
Check switch status with SCAN tool
Check for proper voltage at the PTGM
Charge battery
Check for blown fuse
Check condition of tailgate gas struts
Check code status with SCAN tool
Check wire connections and for blown fuse
Check for foreign matter preventing the
operation of latch assembly
Test motor assembly
Establish location of binding and replace
necessary components
Troubleshoot using electrical schematics
Refer to wiring diagrams
Troubleshoot using electrical schematics.
Refer to wiring diagrams
Check for proper voltage at the PTGM
Charge battery
Check for diagnostic trouble codes with
SCAN tool
Test motor assembly
Check wire connections and for blown fuse
Check for diagnostic trouble codes and cycle
with SCAN tool
Troubleshoot using Body Diagnostic Manual.
Replace latch assembly, if necessary
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