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

Transponder Lock Check


TRANSPONDER LOCK CHECK
Follow the procedure below to judge if the ignition key can be overwritten (i.e. the ignition key is correct) or not.







1. Connect scan tool MB991502 to data link connector (16 pins).
2. Turn the ignition switch to "ON" position.







3. At "System Select," press "YES"







4. Select "Immobilizer," press "YES".







5. Select "Data list" press "YES".










6. Confirm "TP LOCK CHECK."