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Old 11-02-2019, 07:41 AM   #10
kipps
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Join Date: Jul 2014
Location: North-central Virginia
Posts: 688
Re: Dakota Dig. BIM-01-2 info for Gen IV

To edit my post above: I was browsing some alldata stuff, and realized the ecm does know what gear is selected.

Quote:
PRNDL Display

The IPC displays the selected gear position as determined by the ECM. The IPC receives a serial data message from the ECM indicating the gear position. The PRNDL display blanks if:

The ECM detects a malfunction in the transmission range switch circuit.
The IPC detects a loss of serial data communications with the ECM.
Evidently, the prndl position is bounced through a lot of modules before being displayed.

Transmission Control Module --> Engine Control Module --> Body Control Module. Here, it switches to low speed data, and goes to the Instrument Panel Cluster.
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1987 C6P V20 truck, 2010 LMG 5.3, 1997 nv4500, 1991 np241c, hydroboost, 2001 14bff rear axle.
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