Ford Galaxy / Ford S-MAX. Manual — part 965

Most air bag system diagnostic procedures require the use of system deactivation and
system reactivation procedures. These procedures require the air bag module(s) and safety
belt retractor pretensioners to be disconnected from the SRS, thereby removing the risk of
air bag deployment while diagnostics are carried out.

Air bag simulators are required to carry out diagnosis and testing of the air bag system.
The simulator contains a resistor, used to simulate an air bag module connection to the
system. It is not acceptable to short-circuit the air bag module connections with a 0 ohm
jumper wire. If a 0 ohm jumper wire is used to short-circuit the air bag module
connections, an illuminated air bag warning lamp will be displayed and a DTC logged by the
restraints control module (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. 1. Disconnect the battery ground cable.

REFER to:

Battery Disconnect and Connect

(414-01 Battery, Mounting and Cables,

General Procedures).

2. 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. 3. Remove the driver air bag module from the vehicle.

REFER to:

Driver Air Bag Module - Vehicles Built Up To: 13-07-2009

(501-20B

Supplemental Restraint System, Removal and Installation).

4. 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. 5. Disconnect the passenger air bag module electrical connector.

REFER to:

Passenger Air Bag Module

(501-20B Supplemental Restraint System,

Removal and Installation).

6. 6. Connect the passenger air bag simulator to the wiring harness in place of the

passenger air bag module.

7. 7. Remove the driver lower air bag module from the vehicle.

REFER to:

Driver Lower Air Bag Module

(501-20B Supplemental Restraint System,

Removal and Installation).

8. 8. Connect the driver lower air bag simulator to the wiring harness in place of the

driver lower air bag module.

9. 9. Disconnect the side air curtain module electrical connector on both sides.

REFER to:

Side Air Curtain Module - VIN Plate Body Style Code: S

(501-20B

Supplemental Restraint System, Removal and Installation).

10. 10. Connect the side air curtain simulators to the wiring harnesses in place of the

side air curtain modules.

11. 11. Disconnect the driver side underseat occupant restraint systems electrical

connector.

12. 12. Connect the occupant restraint systems simulator to the driver side underseat

occupant restraint systems electrical connector in place of the side air bag module.

13. 13. Disconnect the passenger side underseat occupant restraint systems electrical

connector.

14. 14. Connect the occupant restraint systems simulator to the passenger side

underseat occupant restraint systems electrical connector in place of the side air
bag module.

15. 15. Detach the B-pillar trim panel to gain access to the driver safety belt retractor

pretensioner electrical connector.
REFER to:

B-Pillar Trim Panel

(501-05 Interior Trim and Ornamentation, Removal

and Installation).

16. 16. Disconnect the driver safety belt retractor pretensioner electrical connector.

17. 17. Connect the driver safety belt retractor pretensioner simulator to the wiring

harness in place of the driver safety belt retractor pretensioner.

18. 18. Detach the B-pillar trim panel to gain access to the passenger safety belt

retractor pretensioner electrical connector.
REFER to:

B-Pillar Trim Panel

(501-05 Interior Trim and Ornamentation, Removal

and Installation).

19. 19. Disconnect the passenger safety belt retractor pretensioner electrical connector.

20. 20. Connect the passenger safety belt retractor pretensioner simulator to the wiring

harness in place of the passenger safety belt retractor pretensioner.

21. 21. 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. 1. Disconnect the battery ground cable.

REFER to:

Battery Disconnect and Connect

(414-01 Battery, Mounting and Cables,

General Procedures).

2. 2. Wait at least one minute for the backup power supply in the RCM to deplete its

stored energy.

3. 3. Remove the driver air bag simulator from the sub-harness at the top of the

steering column.

4. 4. Connect and install the driver air bag module.

REFER to:

Driver Air Bag Module - Vehicles Built Up To: 13-07-2009

(501-20B

Supplemental Restraint System, Removal and Installation).

5. 5. Remove the passenger air bag simulator from the passenger air bag module

harness.

6. 6. Connect and install the passenger air bag module.

REFER to:

Passenger Air Bag Module

(501-20B Supplemental Restraint System,

Removal and Installation).

7. 7. Remove the driver lower air bag simulator from the driver lower air bag wiring

harness.

8. 8. Connect and install the driver lower air bag module.

REFER to:

Driver Lower Air Bag Module

(501-20B Supplemental Restraint System,

Removal and Installation).

9. 9. Remove the side air curtain simulators from the side air curtain module wiring

harnesses.

10. 10. Connect and install the side air curtain modules.

REFER to:

Side Air Curtain Module - VIN Plate Body Style Code: S

(501-20B

Supplemental Restraint System, Removal and Installation).

11. 11. Remove the driver side underseat occupant restraint systems simulator.

12. 12. Connect the driver side underseat occupant restraint systems electrical

connector.

13. 13. Remove the passenger side underseat occupant restraint systems simulator.

14. 14. Connect the passenger side underseat occupant restraint systems electrical

connector.

15. 15. Remove the driver safety belt retractor pretensioner simulator from the driver

safety belt retractor pretensioner wiring harness.

16. 16. Connect the driver safety belt retractor pretensioner electrical connector.

17. 17. Attach the B-pillar trim panel.

REFER to:

B-Pillar Trim Panel

(501-05 Interior Trim and Ornamentation, Removal

and Installation).

18. 18. Remove the passenger safety belt retractor pretensioner simulator from the

passenger safety belt retractor pretensioner wiring harness.

19. 19. Connect the passenger safety belt retractor pretensioner electrical connector.

20. 20. Attach the B-pillar trim panel.

REFER to:

B-Pillar Trim Panel

(501-05 Interior Trim and Ornamentation, Removal

and Installation).

21. 21. Connect the battery ground cable.

REFER to:

Battery Disconnect and Connect

(414-01 Battery, Mounting and Cables,

General Procedures).

22. 22. 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 section.

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 section.

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 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 DTCs, 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.

The RCM contains electronic acceleration sensors which measure longitudinal acceleration
and lateral acceleration. Longitudinal and lateral signals, proportional to the amount of
acceleration measured, are fed to a safing micro-controller. The crash 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

The crash sensor contains an acceleration sensor, filter, amplifier and an application specific