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

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Scan Tool Data Definitions

The SIR scan tool data definitions contain a brief description of all SIR related parameters available on the scan tool. The parameters that are available on the scan tool are listed below in alphabetical order.

8-DIGIT GM PART NUMBER: The scan tool displays an 8-digit part number. This number is the GM part number that is stored within the SDM memory.

ADS AID: The scan tool displays 0-20 volts. This is the auxiliary discriminating sensor signal input to the SDM.

CALIBRATION ID: The scan tool displays a 4-digit number. This calibration ID is the check sum of the SDM read only memory contents.

COMPONENT SERIAL #: The scan tool displays the digits of the SDM serial number.

IGNITION VOLTAGE: The scan tool displays 0-20 volts. The Ignition represents the system voltage measured by the SDM at its ignition feed.

JULIAN DATE OF BUILD: The scan tool displays a 3-digit number. The day of the year the module was built.

LF SEAT BELT STATUS: The scan tool displays buckled or unbuckled. The signal from the LF seat belt switch indicates whether the LF seat belt is buckled or unbuckled.

PROM ID: The scan tool displays a 4-digit number. This number is the Programmable Read-only Memory (PROM) ID.

YEAR MODULE BUILT: The scan tool displays what year the module was built.