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No Response From ITM (Intrusion Transceiver Module): Notes

WARNING: This page is about a different car, the 2009 Dodge Caliber. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Intrusion Transceiver Module - Circuit Schematic
GC0100537Courtesy of CHRYSLER LLC

For complete wiring diagrams, refer to SYSTEM WIRING DIAGRAMS .

Possible Causes 
(A415) FUSED B (+) CIRCUIT OPEN OR SHORTED
(Z941) GROUND CIRCUIT OPEN
(D55) AND (D54) CAN B BUS CIRCUITS OPEN
INTRUSION TRANSCEIVER MODULE