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

Keyless Start System




DTC B1120 / B1170 / B1901 / B1902

DTC Detecting Condition and Trouble Area






DTC Confirmation Procedure

1) Push engine switch to change ignition mode to "ON".

DTC Troubleshooting

1. DTC recheck

Clear DTC. DTC Clearance
Push engine switch to change ignition mode to "OFF".
Perform DTC Confirmation Procedure
and then recheck DTC.

Is DTC B1120, B1170, B1901 or B1902 still detected?
YES -
Replace keyless start control module and recheck DTC. Service and Repair
NO -
End.