Diagnosis And Testing - Power Liftgate System: Notes
Before any testing of the power liftgate system is attempted, the battery should be fully-charged.
The latch, the sensors, the switches and the hardwired circuits between components related to the power liftgate system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin out information and location views for the various wire harness connectors, splices and grounds.
However, conventional diagnostic methods will not prove conclusive in the diagnosis of the electronic controls or communication between modules and other devices that provide some features of the power liftgate system. The most reliable, efficient, and accurate means to diagnose the power liftgate system or the electronic controls and communication related to power liftgate system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.
Following are quick reference diagnostic tables to help when diagnosing and testing the power liftgate system.