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

Test Functions

Test Functions
The test functions are used by service mechanics to check the coding. The test functions are also tools for fault finding without a diagnostic tester. The test functions are only shown in the LO display of the instrument cluster. The test functions are activated by pressing the left control button in the instrument cluster (S/R, 5 seconds) with terminal R or terminal 15 "ON".
In addition, the test functions can still be called up by pressing the left control button S/R for Set/Reset) in the instrument cluster with simultaneous activation of terminal R.