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No Response From Park Assist (PARKTRONICS) (PTS) Module: Notes

WARNING: This page is about a different car, the 2009 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: PARK ASSIST (PARKTRONICS) (PTS) MODULE CIRCUIT SCHEMATIC
GC0102398Courtesy of CHRYSLER LLC

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

Possible Causes 
(F921) FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT OPEN OR SHORTED
(Z920) GROUND CIRCUIT OPEN
(D265) AND (D264) CAN INTERIOR BUS (125K) CIRCUITS OPEN
PARK ASSIST (PARKTRONICS) (PTS) MODULE