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Infiniti Forum: QX56 Won't Start
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Old 10-24-2018, 06:39 PM
marctronixx marctronixx is offline
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Join Date: Sep 2011
Location: Los Angeles
Posts: 1,207

Body Control Module = BCM
Transmission Control Module = TCM

both are expensive to replace. the parts may be a few hundred but I dont know. you can search online.

the BCM is the head honcho. it controls/governs many sensors and actions on the car. example, when you want to put the car in drive from Park, the BCM tells the TCM the shift selector has moved to Drive and that the TCM needs to engage the tranny to proceed with the function of driving (the ECM also plays here as its the LOGIC behind all of this) . the BCM also calls for the doors to lock and for the headlamps to engage in sensing the steering wheel )so the lamps can move when the steering wheel moves, etc) , and other functions that happen without our awareness.

the TCM is AS important as the BCM.
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electrical, no crank, no start, startup problem

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