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No Response From Multi-Purpose Module (Police And Taxi Interface Module-PTIM): Notes

WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Multi-Purpose Module (Police & Taxi Interface Module-PTIM) - Circuit Schematic
GC0098194Courtesy of CHRYSLER LLC

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article(s).

Possible Causes 
(A913) FUSED B (+) CIRCUIT OPEN OR SHORTED
(Z910) GROUND CIRCUIT OPEN
(D55) AND (D54) CAN B BUS CIRCUITS OPEN
MULTI-PURPOSE MODULE (POLICE AND TAXI INTERFACE MODULE-PTIM)