A fully multiplexed J1939 instrument panel cluster on a truck with a body control module has the following inoperative gauges: engine oil pressure, coolant temperature, tachometer, and speedometer. The automatic transmission oil temperature gauge, air pressure gauges, fuel level gauge, and turn signal indicators still function correctly. What could be a possible cause of the inoperative gauges?
A. Short circuit between CAN + and CAN -
B. CAN + is shorted to ground.
C. Missing terminating resistors
D. An open CAN + or CAN - circuit between the engine ECM and the instrument panel cluster
Answer: D
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