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
If it fails: lemon-manuals.org.ua

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Scan Tool Data Definitions

SCAN TOOL DATA DEFINITIONS

8 Digit GM Part Number: The scan tool displays an 8 digit number which indicates the GM part number of the module.

Battery Voltage: The scan tool displays the current state of the battery in volts.

Calibration ID: The scan tool displays a 4 digit number which indicates the calibration ID number of the module.

Horn Output: The scan tool displays On/Off to indicate the current state of the horn as commanded by the dash integration module (DIM).

Julian Date of Build: The scan tool displays a 3 digit number which indicates the Julian date of build of the module.

PROM ID: The scan tool displays a 4 digit number that identifies the PROM.

Year Module Built: The scan tool displays a 4 digit number which indicates the year the module was built.