Ford 2003 Mustang Workshop Manual page 4053

Pinpoint Test J: LFC 34/DTC B1934 — Driver Air Bag Circuit Resistance Low
Normal Operation
The restraints control module (RCM) monitors the resistance of the driver air bag ignitor by measuring
the resistance between pins 3 and 4. If the RCM detects low resistance between these pins, it will
store a diagnostic trouble code (DTC) B1934 in memory and flash a lamp fault code (LFC) 34 (or
higher priority code if one exists) on the air bag indicator.
Possible Causes
Driver air bag low resistance can be caused by:
a short in the clockspring windings.
a short in the wiring harness.
a low resistance in the driver air bag module.
an RCM internal concern.
worn or damaged short bar or camming beam.
PINPOINT TEST J: LFC 34/DTC B1934 — DRIVER AIR BAG CIRCUIT
RESISTANCE LOW
J1 CHECK FOR A HARD OR INTERMITTENT DTC
Key in OFF position.
Connect the diagnostic tool. Scan Tool
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool:
Retrieve/Clear Continuous DTCs.
Retrieve and record any continuous DTCs for use later in this
pinpoint test.
Enter the following diagnostic mode on the diagnostic tool: On-
Demand Self Test.
Test Step
Trouble Code
(DTC) Priority
Table in this
section for pinpoint
test direction.
No
RECONNECT the
system.
REACTIVATE the
system. PROVE
OUT the system.
REFER to Air Bag
Supplemental
Restraint System
(SRS) in this
section. CLEAR all
DTCs.
Result / Action to
Take
Yes
This is a hard fault.
The fault condition
is still present. This
fault cannot be
cleared until it is
corrected and the
DTC is no longer
retrieved during the