Operation CHARM: Car repair manuals for everyone.
Home >> Ford >> 2003 >> Excursion 2WD V8-6.0L DSL Turbo >> Repair and Diagnosis >> Restraints and Safety Systems >> Air Bag Systems >> Testing and Inspection >> Pinpoint Tests >> Test O
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 O

PINPOINT TEST O: DTC B1891 - AIR BAG TONE WARNING INDICATOR CIRCUIT SHORTED TO BATTERY OR IGNITION


Test O1:






Test O2:






Test O3-O4:






Test O5:






Normal Operation
The Restraints Control Module (RCM) monitors its connection to the Instrument Cluster at pin 26. This connection is used to signal a chime if the air bag indicator is inoperative and another SRS fault exists. If the RCM detects a short to battery or ignition on the connection to the Instrument Cluster, it Will store a Diagnostic Trouble Code (DTC) B1891 in memory.

Possible Causes
All air bag tone warning indicator circuit short to battery or ignition can be caused by:
^ a short to battery or ignition on circuit 1083 (LB/BK).
^ a damaged or inoperative instrument cluster.
^ an RCM internal concern.
pro multis · About Operation CHARM