Operation CHARM: Car repair manuals for everyone.
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

Scan Tool Data Definitions

SCAN TOOL DATA DEFINITIONS

8 Digit GM Part Number: The scan tool displays the 8 digit BCM part number for service identification.

Electronics Battery Fd: The scan tool displays 0.0-25.5 volts. Electronics Battery Fd represents the system voltage measured by the BCM at its battery feed input.

Ignition 0 (Data: The scan tool displays 0.0-25.5 volts. The Ignition 0 voltage represents the system voltage measured at the BCM Ignition 0 feed input.

Ignition 0 (Inputs): The scan tool displays Active/Inactive. The scan tool displays Active when the ignition switch is in ACCY or RUN positions.

Ignition 1: The scan tool displays Active/Inactive. The scan tool displays Active when the ignition switch is in RUN or START positions.

Ignition Accessory: The scan tool displays Active/Inactive. The scan tool displays Active when the ignition switch is in ACCY or RUN positions.

Key In Ignition: The scan tool displays Active/Inactive. The scan tool displays Active when the ignition key is inserted into the ignition switch.

Park/Neutral Switch: The scan tool displays Active/Inactive. The scan tool displays Active when the shift lever is in the Park or Neutral positions.