Ford Focus RS (2011 year). Instruction — part 89
module connections, an illuminated air bag warning
lamp will be displayed and a DTC logged by the
RCM.
Deactivation
WARNING: To avoid accidental
deployment, the RCM backup power supply
must be depleted. Wait at least one minute
after disconnecting the battery ground
cable(s) before commencing any repair or
adjustment to the SRS, or any
component(s) adjacent to the SRS sensors.
Failure to follow these instructions may
result in personal injury.
1. Disconnect the battery ground cable.
REFER to:
Battery Disconnect and Connect
(414-01 Battery, Mounting and Cables,
General Procedures).
2. Wait at least one minute for the backup power
supply in the RCM to deplete its stored energy.
WARNING: To minimize the possibility of
premature deployment, live air bag
modules must only be placed on work
benches which have been ground bonded
and with the trim cover facing up. Failure
to follow these instructions may result in
personal injury.
3. Remove the driver air bag module from the
vehicle.
REFER to:
Driver Air Bag Module
(501-20
Supplemental Restraint System, Removal and
Installation).
4. Connect the driver air bag simulator to the
sub-harness in place of the driver air bag
module at the top of the steering column.
5. Disconnect the passenger air bag module
electrical connector.
Vehicles Built From: 04/2006
(501-20
Supplemental Restraint System, Removal and
Installation).
6. Connect the passenger air bag simulator to the
wiring harness in place of the passenger air bag
module.
7. Disconnect the side air curtain module electrical
connector on both sides. REFER to: (501-20
Supplemental Restraint System)
8. Connect the side air curtain simulators to the
wiring harnesses in place of the side air curtain
modules.
9. Disconnect the driver side underseat occupant
restraint systems electrical connector.
10. Connect the occupant restraint systems
simulator to the driver side underseat occupant
restraint systems electrical connector in place
of the safety belt pretensioner and side air bag
module.
11. Disconnect the passenger side underseat
occupant restraint systems electrical connector.
12. Connect the occupant restraint systems
simulator to the passenger side underseat
occupant restraint systems electrical connector
in place of the safety belt pretensioner and side
air bag module.
13. Connect the battery ground cable.
REFER to:
Battery Disconnect and Connect
(414-01 Battery, Mounting and Cables,
General Procedures).
Reactivation
WARNING: The air bag simulators must be
removed and the air bag modules
reconnected when reactivated to avoid
non-deployment in a collision. Failure to
follow this instruction may result in
personal injury.
1. Disconnect the battery ground cable.
REFER to:
Battery Disconnect and Connect
(414-01 Battery, Mounting and Cables,
General Procedures).
2. Wait at least one minute for the backup power
supply in the RCM to deplete its stored energy.
3. Remove the driver air bag simulator from the
sub-harness at the top of the steering column.
4. Connect and install the driver air bag module.
Supplemental Restraint System, Removal and
Installation).
5. Remove the passenger air bag simulator from
the passenger air bag module wiring harness.
6. Connect and install the passenger air bag
module.
Restraint System, Removal and Installation).
7. Remove the side air curtain simulators from the
side air curtain module wiring harnesses.
G401865en
501-20B-
16
Supplemental Restraint System
501-20B-
16
DIAGNOSIS AND TESTING
REFER to:
Driver Air Bag Module
(501-20
/
Passenger Air Bag Module - Vehicles Built
From: 04/2006
(501-20 Supplemental
Side Air Curtain Module - Vehicles Built From:
22-06-2007
(Removal and Installation),
REFER to:
Passenger Air Bag Module -
8. Connect and install the side air curtain modules.
REFER to: (501-20 Supplemental Restraint
System)
9. Remove the driver side underseat occupant
restraint systems simulator.
10. Connect the driver side underseat occupant
restraint systems electrical connector.
11. Remove the passenger side underseat occupant
restraint systems simulator.
12. Connect the passenger side underseat occupant
restraint systems electrical connector.
13. Connect the battery ground cable.
(414-01 Battery, Mounting and Cables,
General Procedures).
14. Prove out the system.
Glossary
Air Bag Simulator
Air bag simulators are used to simulate air bag
module connections to the system.
Deactivate the System
Deactivate the system means to carry out the
deactivation procedure. REFER to Deactivation in
this procedure.
Prove Out the System
The air bag warning indicator will illuminate for
three seconds. If there is a fault condition, the air
bag warning indicator will stay illuminated or
illuminate after a five second delay.
Reactivate the System
Reactivate the system means to carry out the
reactivation procedure. REFER to Reactivation in
this procedure.
Principles of Operation
SRS Operation
The vehicle is equipped with a DC fired sensing
system.
In the event of a severe frontal or three-quarter
frontal impact, in excess of a predetermined limit,
the driver and passenger front air bags and safety
belt buckle pretensioners will deploy.
In the event of a severe full side impact, in excess
of a predetermined limit, either the driver or
passenger side air bag, side air curtain (if
equipped) and both safety belt buckle
pretensioners will deploy.
Air bag deployment will only occur, in the event of
a severe collision, when the ignition key is in the
RUN position. The passenger air bag deactivation
(PAD) switch (if equipped) will deactivate the
passenger air bag, passenger safety belt buckle
pretensioner and passenger side air bag in the
event of a severe frontal or side impact; it will not
deactivate the passenger side air curtain.
RCM
The RCM retains full control of the whole system,
providing continual system checks and full
diagnostic capabilities. The non-volatile memory
stores the diagnostic trouble codes, which can then
be downloaded through the data link connector
(DLC) to the Ford approved diagnostic tool.
In the event of a failure in the vehicle supply during
an accident, the RCM provides a backup power
supply, sufficient to deploy the air bag(s) for a
minimum of 150 ms. The backup power supply is
discharged by the RCM within 60 seconds of the
battery ground cable being disconnected.
RCM - Vehicles built up to 05/2005
The RCM contains electronic acceleration sensors
which measure the longitudinal acceleration and
the lateral acceleration and provide both signals
to the micro-controller proportional to the amount
of acceleration measured. When these sensors
sense an impact in excess of a predetermined limit,
and the crash sensor or side impact sensor sends
a signal to the RCM, the RCM initiates the circuit
to deploy the air bag(s). The RCM also contains a
safing sensor which enables the front air bags and
the safety belt buckle pretensioners in the event
of a front impact. The safing sensor also prevents
unintentional deployment of the front air bags and
safety belt buckle pretensioners in the event of a
fault in the electronic acceleration sensor(s).
RCM - Vehicles built from 05/2005
The RCM contains two electronic acceleration
sensors which measure longitudinal acceleration
and one electronic acceleration sensor which
measures lateral acceleration. One longitudinal
G401865en
501-20B-
17
Supplemental Restraint System
501-20B-
17
DIAGNOSIS AND TESTING
Side Air Curtain Module - Vehicles Built From
:
22-06-2007
(Removal and Installation),
REFER to:
Battery Disconnect and Connect
acceleration sensor replaces the crash sensor as
a safing sensor. Longitudinal and lateral signals,
proportional to the amount of acceleration
measured, are fed to a safing micro-controller. The
second longitudinal acceleration sensor and the
side impact sensors also feed signals, proportional
to the amount of acceleration, to a micro-controller.
When both micro-controllers sense an impact in
excess of a predetermined limit the RCM initiates
the circuit to deploy the air bag(s). The safing
micro-controller enables the front air bags and the
safety belt buckle pretensioners in the event of a
front impact. The safing micro-controller also
prevents unintentional deployment of the front air
bags and safety belt buckle pretensioners in the
event of a fault in the electronic acceleration
sensor(s).
Crash Sensor – Vehicles built up to 05/2005
NOTE: From 05/2005 onwards the vehicle will not
be equipped with a crash sensor.
The crash sensor contains an acceleration sensor,
filter, amplifier and an application specific
integrated circuit for signal transmitting and is
mounted on the radiator grille opening panel
reinforcement. The crash sensor sends a signal at
a level determined by the crash severity to the
RCM. The RCM will evaluate the signal against
stored data and deploy the frontal air bags and
safety belt buckle pretensioners if required. Both
the crash sensor and the internal RCM longitudinal
acceleration sensor must exceed a preset limit to
initiate the air bag.
Side Impact Sensor
The side impact sensors are mounted at the base
of the B-pillar on either side of the vehicle, to
facilitate remote lateral impact sensing. Each side
impact sensor contains an acceleration sensor,
filter, amplifier and an application specific
integrated circuit for signal transmitting. In the event
of an impact, in excess of a predetermined limit,
the side impact sensor sends a signal at a level
determined by the crash severity to the RCM. The
RCM will evaluate the signal against stored data
and deploy the side air bag on the side the
deployment request was initiated. Both the side
impact sensor and the internal RCM lateral
acceleration sensor must exceed a preset limit to
initiate the air bag. The RCM retains control of the
side air bags, side air curtains and safety belt
buckle pretensioners.
Air Bag Warning Indicator
The air bag warning indicator is incorporated into
the instrument cluster, together with the automatic
detach detect circuit. The air bag warning indicator
illuminates for three seconds at key ON. If the
system self-tests OK the indicator extinguishes, if
there is a fault condition, the air bag warning
indicator will stay illuminated or illuminate after a
five second delay.
The system is designed to illuminate the air bag
is broken, either by loss of power, ground supply,
module disconnect or CAN BUS failure. The RCM
retaining bolts are the ground circuit.
Diagnostic evaluation of the SRS can be made
through the DLC and the Ford approved diagnostic
tool to establish the nature of the concern. Once
the DTC is known the appropriate course of action
can be selected from the Symptom Chart.
Inspection and Verification
1. Verify the customer concern by operating the
system.
2. Visually inspect for obvious signs of mechanical
or electrical damage.
Visual Inspection Chart
Electrical
• Fuse(s)
• Electrical connector(s)
• Circuit(s)
• Wiring harness
• Air bag module(s)
3. If an obvious cause for an observed or reported
concern is found, correct the cause (if possible)
before proceeding to the next step.
4. If the cause is not visually evident, connect the
Ford approved diagnostic tool to the DLC and
select the vehicle to be tested from the Ford
approved diagnostic tool menu.
5. Retrieve the DTCs and refer to the Symptom
Chart.
G401865en
501-20B-
18
Supplemental Restraint System
501-20B-
18
DIAGNOSIS AND TESTING
warning indicator continuously if the RCM circuit
Symptom Chart
NOTE: It is only allowed to repair circuits between connectors. If damage has occurred within a connector
a connector replacement kit, if available, must be installed. If a connector replacement kit is not available
a new wiring harness must be installed. Connectors must not be disassembled.
Action
Possible Sources
Symptom
•
• DLC.
• RCM.
• Circuit(s).
• No communication with the
module
NOTE: Check for a matching
‘cross link to another firing circuit’
DTC before carrying out the
pinpoint test.
•
• Circuit(s).
• DTC B1046: Driver side air
curtain cross link to another
firing circuit
NOTE: Check for a matching
‘cross link to another firing circuit’
DTC before carrying out the
pinpoint test.
•
• Circuit(s).
• DTC B1047: Driver side air bag
cross link to another firing
circuit
NOTE: Check for a matching
‘cross link to another firing circuit’
DTC before carrying out the
pinpoint test.
•
• Circuit(s).
• DTC B1048: Passenger air bag
cross link to another firing
circuit
NOTE: Check for a matching
‘cross link to another firing circuit’
DTC before carrying out the
pinpoint test.
•
• Circuit(s).
• DTC B1049: Passenger safety
belt pretensioner cross link to
another firing circuit
NOTE: Check for a matching
‘cross link to another sensor’ DTC
before carrying out the pinpoint
test.
•
• Circuit(s).
• DTC B104B: Driver side impact
sensor cross link to another
sensor
NOTE: Check for a matching
‘cross link to another sensor’ DTC
before carrying out the pinpoint
test.
•
• Circuit(s).
• DTC B104C: Passenger side
impact sensor cross link to
another sensor
NOTE: Check for a matching
‘cross link to another sensor’ DTC
before carrying out the pinpoint
test.
•
• Circuit(s).
• DTC B104D: Front crash
sensor cross link to another
sensor
•
• Circuit(s).
• DTC B104E: Driver side impact
sensor short to ground or
battery
G401865en
501-20B-
19
Supplemental Restraint System
501-20B-
19
DIAGNOSIS AND TESTING
GO to
Pinpoint Test I.
GO to
Pinpoint Test H.
GO to
Pinpoint Test G.
GO to
Pinpoint Test F.
GO to
Pinpoint Test E.
GO to
Pinpoint Test D.
GO to
Pinpoint Test C.
GO to
Pinpoint Test B.
GO to
Pinpoint Test A.
Action
Possible Sources
Symptom
• INSTALL a new side impact
sensor.
(501-20 Supplemental
Restraint System, Removal
and Installation)
REPEAT the self-test, CLEAR
the DTCs.
• Side impact sensor.
• DTC B104F: Passenger side
impact sensor internal fault
•
• Circuit(s).
• DTC B1050: Passenger side
impact sensor short to ground
or battery
• INSTALL a new side impact
sensor.
(501-20 Supplemental
Restraint System, Removal
and Installation)
REPEAT the self-test, CLEAR
the DTCs.
• Side impact sensor.
• DTC B1051: Driver side impact
sensor internal fault
•
• Circuit(s).
• DTC B1052: Passenger safety
belt buckle switch cross link to
another circuit
•
• Circuit(s).
• DTC B1053: Driver safety belt
buckle switch cross link to
another circuit
NOTE: Check for a matching
‘cross link to another firing circuit’
DTC before carrying out the
pinpoint test.
•
• Circuit(s).
• DTC B1054: Driver safety belt
pretensioner cross link to
another firing circuit
NOTE: Check for a matching
‘cross link to another firing circuit’
DTC before carrying out the
pinpoint test.
•
• Circuit(s).
• DTC B1055: Passenger side
air bag cross link to another
firing circuit
NOTE: Check for a matching
‘cross link to another firing circuit’
DTC before carrying out the
pinpoint test.
•
• Circuit(s).
• DTC B1056: Passenger side
air curtain cross link to another
firing circuit
NOTE: Check for a matching
‘cross link to another firing circuit’
DTC before carrying out the
pinpoint test.
•
• Circuit(s).
• DTC B1057: Driver air bag
cross link to another firing
circuit
G401865en
501-20B-
20
Supplemental Restraint System
501-20B-
20
DIAGNOSIS AND TESTING
REFER to:
Side Impact Sensor
REFER to:
Side Impact Sensor
GO to
Pinpoint Test J.
GO to
Pinpoint Test K.
GO to
Pinpoint Test L.
GO to
Pinpoint Test M.
GO to
Pinpoint Test N.
GO to
Pinpoint Test O.
GO to
Pinpoint Test P.
Action
Possible Sources
Symptom
• INSTALL a new RCM.
REFER to:
Restraints Control
Module (RCM)
(501-20
Supplemental Restraint
System, Removal and Install-
ation)
REPEAT the self-test, CLEAR
the DTCs.
• RCM.
• DTC B105A: Restraints control
module (RCM) crash counter
full
NOTE: The data memory can be
cleared a maximum of five times.
• Clear the data memory using
the Ford approved diagnostic
tool. REPEAT the self-test,
CLEAR the DTCs.
• Crash data memory full.
• DTC B1231: Longitudinal
acceleration threshold
exceeded
• Check the charging system.
REFER to: Charging System
(414-00 Charging System -
General Information,
Diagnosis and Testing).
REPEAT the self-test, CLEAR
the DTCs.
• Charging system.
• DTC B1317: Battery voltage
high
•
• Battery.
• Charging system.
• Circuit.
• DTC B1318: Battery voltage
low
• INSTALL a new RCM.
REFER to:
Restraints
Control
Module (RCM)
(501-20
Supplemental Restraint
System, Removal and Install-
ation)
REPEAT the self-test, CLEAR
the DTCs.
• RCM.
• DTC B1342: Restraints control
module (RCM) is defective
• Check the instrument cluster.
REPEAT the self-test, CLEAR
the DTCs.
• Instrument cluster.
• DTC B1868: Air bag warning
indicator lamp circuit failure
•
• Mismatch between PAD indic-
ator and PAD switch circuit.
• DTC B1871: Passenger air bag
deactivation (PAD) module fault
•
• Driver safety belt pretensioner.
• Circuit(s).
• DTC B1877: Driver safety belt
pretensioner open circuit
•
• Driver safety belt pretensioner.
• Circuit(s).
• DTC B1878: Driver safety belt
pretensioner short to battery
•
• Driver safety belt pretensioner.
• Circuit(s).
• DTC B1879: Driver safety belt
pretensioner short to ground
G401865en
501-20B-
21
Supplemental Restraint System
501-20B-
21
DIAGNOSIS AND TESTING
GO to
Pinpoint Test Q.
GO to
Pinpoint Test R.
GO to
Pinpoint Test S.
GO to
Pinpoint Test U.
GO to
Pinpoint Test T.
Action
Possible Sources
Symptom
•
• Passenger safety belt preten-
sioner.
• Circuit(s).
• DTC B1881: Passenger safety
belt pretensioner open circuit
•
• Passenger safety belt preten-
sioner.
• Circuit(s).
• DTC B1882: Passenger safety
belt pretensioner short to
battery
•
• Passenger safety belt preten-
sioner.
• Circuit(s).
• DTC B1883: Passenger safety
belt pretensioner short to
ground
•
• RCM.
• PAD indicator.
• Circuit(s).
• DTC 1884: Passenger air bag
deactivation (PAD) indicator
inoperative
•
• Driver safety belt pretensioner.
• Circuit(s).
• DTC B1885: Driver safety belt
pretensioner low resistance
•
• Passenger safety belt preten-
sioner.
• Circuit(s).
• DTC B1886: Passenger safety
belt pretensioner low resistance
•
• PAD indicator.
• Circuit(s).
• DTC B1890: Passenger air bag
deactivation (PAD) indicator
short to battery
•
• Clockspring.
• Circuit(s).
• DTC B1916: Driver air bag
short to battery
•
• RCM internal fault.
• DTC B1921: Air bag diagnostic
monitor ground circuit open
•
• Circuit(s).
• DTC B1925: Passenger air bag
short to battery
•
• Driver air bag module.
• Clockspring.
• Circuit(s).
• DTC B1932: Driver air bag
open circuit
•
• Passenger air bag module.
• Circuit(s).
• DTC B1933: Passenger air bag
open circuit
•
• Driver air bag module.
• Clockspring.
• Circuit(s).
• DTC B1934: Driver air bag
circuit low resistance
•
• Passenger air bag module.
• Circuit(s).
• DTC B1935: Passenger air bag
circuit low resistance
•
• Driver air bag module.
• Clockspring.
• Circuit(s).
• DTC B1936: Driver air bag
circuit short to ground
•
• Passenger air bag module.
• Circuit(s).
• DTC B1938: Passenger air bag
circuit short to ground
•
• Driver side air bag module.
• Circuit(s).
• DTC B1992: Driver side air bag
circuit short to battery
•
• Driver side air bag module.
• Circuit(s).
• DTC B1993: Driver side air bag
circuit short to ground
G401865en
501-20B-
22
Supplemental Restraint System
501-20B-
22
DIAGNOSIS AND TESTING
GO to
Pinpoint Test V.
GO to
Pinpoint Test W.
GO to
Pinpoint Test X.
GO to
Pinpoint Test Y.
GO to
Pinpoint Test Z.
GO to
Pinpoint Test AA.
GO to
Pinpoint Test AB.
GO to
Pinpoint Test AC.
GO to
Pinpoint Test AD.
GO to
Pinpoint Test AE.
GO to
Pinpoint Test AF.
GO to
Pinpoint Test AG.
GO to
Pinpoint Test AH.
GO to
Pinpoint Test AI.
GO to
Pinpoint Test AJ.
GO to
Pinpoint Test AK.
GO to
Pinpoint Test AL.
GO to
Pinpoint Test AM.
Action
Possible Sources
Symptom
•
• Driver side air bag module.
• Circuit(s).
• DTC B1994: Driver side air bag
circuit open circuit
•
• Driver side air bag module.
• Circuit(s).
• DTC B1995: Driver side air bag
circuit low resistance
•
• Passenger side air bag module.
• Circuit(s).
• DTC B1996: Passenger side
air bag circuit short to battery
•
• Passenger side air bag module.
• Circuit(s).
• DTC B1997: Passenger side
air bag circuit short to ground
•
• Passenger side air bag module.
• Circuit(s).
• DTC B1998: Passenger side
air bag circuit open circuit
•
• Passenger side air bag module.
• Circuit(s).
• DTC B1999: Passenger side
air bag circuit low resistance
• INSTALL a new crash sensor.
REFER to:
Crash Sensor
(501-
20 Supplemental Restraint
System, Removal and Install-
ation).
REPEAT the self-test, CLEAR
the DTCs.
• Crash sensor.
• DTC B2226: Front crash sensor
internal fault
•
• Crash sensor.
• RCM.
• Circuit(s).
• DTC B2227: Front crash sensor
communications fault
•
• Driver safety belt buckle switch.
• Circuit(s).
• DTC B2433: Driver safety belt
buckle switch circuit short to
battery
•
• Passenger safety belt buckle
switch.
• Circuit(s).
• DTC B2437: Passenger safety
belt buckle switch circuit short
to battery
• CHECK model option content.
CONFIGURE the RCM. For
additional information, REFER
to the Ford approved diagnostic
tool.
• New RCM incorrectly
configured.
• DTC B2477: Restraints control
module (RCM) configuration
failure
•
• Driver side air curtain module.
• Circuit(s).
• DTC B2773: Driver side air
curtain circuit low resistance
•
• Driver side air curtain module.
• Circuit(s).
• DTC B2774: Driver side air
curtain circuit open circuit
•
• Driver side air curtain module.
• Circuit(s).
• DTC B2775: Driver side air
curtain circuit short to ground
•
• Circuit(s).
• DTC B2776: Driver side air
curtain circuit short to battery
•
• Passenger side air curtain
module.
• Circuit(s).
• DTC B2777: Passenger side
air curtain circuit low resistance
G401865en
501-20B-
23
Supplemental Restraint System
501-20B-
23
DIAGNOSIS AND TESTING
GO to
Pinpoint Test AN.
GO to
Pinpoint Test AO.
GO to
Pinpoint Test AP.
GO to
Pinpoint Test AQ.
GO to
Pinpoint Test AR.
GO to
Pinpoint Test AS.
GO to
Pinpoint Test AT.
GO to
Pinpoint Test AU.
GO to
Pinpoint Test AV.
GO to
Pinpoint Test AW.
GO to
Pinpoint Test AX.
GO to
Pinpoint Test AY.
GO to
Pinpoint Test AZ.
GO to
Pinpoint Test BA.
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