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

Troubleshooting Procedure When Vehicle Power Does Not Turn on




TROUBLESHOOTING PROCEDURE WHEN VEHICLE POWER DOES NOT TURN ON

When the power does not turn ON, open and close the driver's door several times.
Then, check the communication between OSS-ECU and scan tool MB991958 and others as shown in the flowchart below. (OSS-ECU can communicate with the scan tool MB991958 even when the power supply is OFF.)