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
Accessory Relay Command
- The scan tool displays the state of the accessory relay command.

Battery Voltage Signal
- The scan tool displays the vehicle voltage.

Ignition Mode Switch
- The scan tool displays the ignition switch voltage signal. This signal is derived from the ignition Off/Run/Crank circuit.

Ignition Switch Accessory
- The scan tool displays the state of the ignition switch accessory circuit.

Ignition Switch Run/Crank
- The scan tool displays the state of the ignition switch Run/Crank circuit.

Key In Ignition Cylinder
- The scan tool displays whether or not the key is in the ignition cylinder.

Power Mode
- The scan tool displays the vehicle power mode.

Run Relay Command
- The scan tool displays the state of the Run relay.

Run Crank Relay Command
- The scan tool displays the state of the Run Crank relay.