Operation CHARM: Car repair manuals for everyone.
Home >> Oldsmobile >> 1999 >> Cutlass V6-191 3.1L VIN M SFI >> Repair and Diagnosis >> Body and Frame >> Body Control Systems >> Body Control Module >> Testing and Inspection >> Scan Tool Testing and Procedures >> BCM To Cluster Data >> Gear Position
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Gear Position

Range: PARK/REVERSE/NEUTRAL/DRIVE/DRIVE 3/DRIVE 2/DRIVE 1:
This data indicates what message is being sent from the BCM to the instrument cluster in order to control the illumination of the PRNDL display. The PCM reads the transaxle range switch and transmits the selected gear position information over the class 2 serial data serial data line.

The BCM reads this gear selection information and transmits this information to the instrument cluster over the SPI data line. The instrument cluster turns on the correct PRNDL indicator.
pro multis · About Operation CHARM