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)

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Description of Parameters






Description of parameters

Signal strength
Indicates signal amplitude in the interval 0-255. To obtain corresponding dBµV-value, use the following conversion table.





Due to tolerances of the units, the values in the conversion table shall be regarded as approximate.

Note! Parameters that show status of the buttons are only available for vehicles equipped with steering wheel buttons as well as on model year 2005 and later.

The following buttons refer to the steering wheel buttons.
Buttons have two possible status modes:
Off = Control module does not consider selected button pressed in.
On = Control module considers selected button pressed in.

Buttons
Volume up
The value shows if the button for adjusting volume up is pressed in.
Volume down
The value shows if the button for adjusting volume down is pressed in.
Next up
The value shows if the button for selecting next sound track or radio station is pressed in.
Next down
The value shows if the button for selecting previous sound track or radio station is pressed in.
On-button, telephone (green telephone)
The value shows if the on-button for the telephone is pressed in.
Off-button, telephone (red telephone)
The value shows if the off-button for the telephone is pressed in.