Ford 2003 Mustang Workshop Manual page 4056

Pinpoint Test K: LFC 35/DTC B1935 — Passenger Air Bag Circuit Resistance Low
Normal Operation
The restraints control module (RCM) monitors the resistance of the passenger air bag ignitor by
measuring the resistance between pins 6 and 7. If the RCM detects low resistance between these
pins, it will store a diagnostic trouble code (DTC) B1935 in memory and flash a lamp fault code (LFC)
35 (or higher priority code if one exists) on the air bag indicator.
Possible Causes
Passenger air bag low resistance can be caused by:
a short in the wiring harness.
a low resistance in the passenger air bag module.
an RCM internal concern.
a worn or damaged connector shorting bar or camming beam.
PINPOINT TEST K: LFC 35/DTC B1935 — PASSENGER AIR BAG
CIRCUIT RESISTANCE LOW
K1 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.
Was DTC B1935 retrieved during the on-demand self test?
K2 CHECK THE PASSENGER AIR BAG MODULE
WARNING: If the supplemental restraint system (SRS) is
being serviced, the system must be deactivated and restraint
system diagnostic tools must be installed. Refer to
Supplemental Restraint System (SRS)
Test Step
in this section.
(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
on-demand self
test. GO to
No
This is an
intermittent fault.
The fault condition
is not present at
this time. GO to
K4 .
Yes
GO to K3
Air Bag
No
INSTALL a new
K2 .
.