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*No Response From Sentry Key Remote Entry Module: Notes

Fig 1: Sentry Key Remote Entry Module SCI, Power & Ground Circuits Schematic
GC0034974Courtesy of DAIMLERCHRYSLER CORP.
POSSIBLE CAUSES 
FUSED B+ CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
GROUND CIRCUIT OPEN
SCI TRANSMIT CIRCUIT OPEN
SCI TRANSMIT CIRCUIT SHORTED TO GROUND
SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE
BODY CONTROL MODULE
SENTRY KEY REMOTE ENTRY MODULE

For a complete Data Link Connector Circuit Diagram, (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - SCHEMATICS AND DIAGRAMS) .