Content .. 88 89 90 91 ..

Ford Focus RS (2011 year). Manual - part 90

Action

Possible Sources

Symptom

•

• Passenger side air curtain

module.

• Circuit(s).

• DTC B2778: Passenger side

air curtain circuit open circuit

•

• Passenger side air curtain

module.

• Circuit(s).

• DTC B2779: Passenger side

air curtain circuit short to
ground

•

• Circuit(s).

• DTC B2780: Passenger side

air curtain circuit short to
battery

•

• Circuit(s).

• DTC B2855: Front crash sensor

circuit short to battery or ground

• INSTALL the correct crash

sensor.

REFER to:

Crash Sensor

(501-

20 Supplemental Restraint
System, Removal and Install-
ation).

REPEAT the self-test, CLEAR
the DTCs.

• Incorrect new crash sensor

installed.

• DTC B2856: Front crash sensor

to restraints control module
(RCM) mismatch

• INSTALL the correct side

impact sensor.

REFER to:

Side Impact Sensor

(501-20 Supplemental
Restraint System, Removal
and Installation)

REPEAT the self-test, CLEAR
the DTCs.

• Incorrect new side impact

sensor installed.

• DTC B2886: Passenger side

impact sensor to restraints
control module (RCM)
mismatch

• INSTALL the correct side

impact sensor.

REFER to:

Side Impact Sensor

(501-20 Supplemental
Restraint System, Removal
and Installation)

REPEAT the self-test, CLEAR
the DTCs.

• Incorrect new side impact

sensor installed.

• DTC B2887: Driver side impact

sensor to restraints control
module (RCM) mismatch

•

• Circuit(s).

• DTC U0073: Restraints control

module (RCM) communication
bus off

•

• Circuit(s).

• DTC U1900: CAN communica-

tion bus fault

•

• Driver side impact sensor.
• RCM.
• Circuit(s).

• DTC U2017: Driver side impact

sensor communications fault

•

• Passenger side impact sensor.
• RCM.
• Circuit(s).

• DTC U2018: Passenger side

impact sensor communications
fault

G401865en

501-20B-

Supplemental Restraint System

501-20B-

DIAGNOSIS AND TESTING

GO to

Pinpoint Test BB.

GO to

Pinpoint Test BC.

GO to

Pinpoint Test BD.

GO to

Pinpoint Test BE.

GO to

Pinpoint Test BF.

GO to

Pinpoint Test BG.

GO to

Pinpoint Test BH.

GO to

Pinpoint Test BI.

Pinpoint Tests

PINPOINT TEST A : NO COMMUNICATION WITH THE MODULE

DETAILS/RESULTS/ACTIONS

TEST CONDITIONS

A1: CHECK THE AIR BAG WARNING INDICATOR

1 Ignition switch in position II.

2 The air bag warning indicator should illuminate

when the ignition is in the ON position for three
seconds then go out. If a fault is present, the air
bag warning indicator will illuminate after five
seconds.

• Does the air bag warning indicator illuminate

after five seconds?

ൺ

Yes

INSTALL a new RCM.

REFER to:

Restraints Control Module (RCM)

(501-20 Supplemental Restraint System,
Removal and Installation).

REPEAT the self-test, CLEAR the DTCs.
REACTIVATE the system.

ൺ

A2: CHECK THE DLC CIRCUIT

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 Ignition switch in position 0.

2 Deactivate the SRS.

3 Disconnect RCM C426.

G401865en

501-20B-

Supplemental Restraint System

501-20B-

DIAGNOSIS AND TESTING

GO to A2.

DETAILS/RESULTS/ACTIONS

TEST CONDITIONS

4 Measure the resistance between the:

• DLC C200 pin 3, circuit 4-EC10 (GY) and the

RCM C426 pin 19, circuit 4-EC10N (GY),
harness side.

• DLC C200 pin 11, circuit 5-EC10 (BU) and the

RCM C426 pin 20, circuit 5-EC10N (BU),
harness side.

TIE0036828

• Are the resistances less than 5 ohms?

ൺ

Yes

INSTALL a new RCM.

REFER to:

Restraints Control Module (RCM)

(501-20 Supplemental Restraint System,
Removal and Installation).

REPEAT the self-test, CLEAR the DTCs.
REACTIVATE the system.

ൺ

REPAIR circuit 4-EC10N (GY) or circuit 5-
EC10N (BU). REPEAT the self-test, CLEAR
the DTCs. REACTIVATE the system.

PINPOINT TEST B : DTC B1046: DRIVER SIDE AIR CURTAIN CROSS LINK TO ANOTHER FIRING
CIRCUIT

DETAILS/RESULTS/ACTIONS

TEST CONDITIONS

B1: CHECK THE DRIVER SIDE AIR CURTAIN CIRCUITS

1 Deactivate the SRS.

2 Disconnect RCM C429.

3 Disconnect Driver Side Air Curtain Module

Simulator.

4 Disconnect Inoperative Air Bag Module Simu-

lator.

G401865en

501-20B-

Supplemental Restraint System

501-20B-

DIAGNOSIS AND TESTING

DETAILS/RESULTS/ACTIONS

TEST CONDITIONS

NOTE: Refer to the Wiring Diagrams for pin detail.

5 Measure the resistance between the:

• RCM C429 pin 1, circuit 91S-JA50 (BK/RD),

harness side and the inoperative air bag module
circuits.

• RCM C429 pin 2, circuit 15S-JA50 (GN/OG),

harness side and the inoperative air bag module
circuits.

• Are the resistances greater than 10,000 ohms?

ൺ

Yes

REPEAT the self-test, CLEAR the DTCs.
REACTIVATE the system.

ൺ

REPAIR the circuits. REPEAT the self-test,
CLEAR the DTCs. REACTIVATE the system.

PINPOINT TEST C : DTC B1047: DRIVER SIDE AIR BAG CROSS LINK TO ANOTHER FIRING
CIRCUIT

DETAILS/RESULTS/ACTIONS

TEST CONDITIONS

C1: CHECK THE DRIVER SIDE AIR BAG CIRCUITS

1 Deactivate the SRS.

2 Disconnect RCM C429.

3 Disconnect Driver Side Underseat Occupant

Restraint Systems Simulator.

4 Disconnect Inoperative Air Bag Module Simu-

lator.

G401865en

501-20B-

Supplemental Restraint System

501-20B-

DIAGNOSIS AND TESTING

DETAILS/RESULTS/ACTIONS

TEST CONDITIONS

NOTE: Refer to the Wiring Diagrams for pin detail.

5 Measure the resistance between the:

• RCM C429 pin 19, circuit 91S-JA37 (BK/GN),

harness side and the inoperative air bag module
circuits.

• RCM C429 pin 20, circuit 15S-JA37 (GN/BK),

harness side and the inoperative air bag module
circuits.

• Are the resistances greater than 10,000 ohms?

ൺ

Yes

REPEAT the self-test, CLEAR the DTCs.
REACTIVATE the system.

ൺ

REPAIR the circuits. REPEAT the self-test,
CLEAR the DTCs. REACTIVATE the system.

PINPOINT TEST D : DTC B1048: PASSENGER AIR BAG CROSS LINK TO ANOTHER FIRING CIRCUIT

DETAILS/RESULTS/ACTIONS

TEST CONDITIONS

D1: CHECK THE PASSENGER AIR BAG CIRCUITS

1 Deactivate the SRS.

2 Disconnect RCM C426.

3 Disconnect Passenger Air Bag Module Simu-

lator.

4 Disconnect Inoperative Air Bag Module Simu-

lator.

G401865en

501-20B-

Supplemental Restraint System

501-20B-

DIAGNOSIS AND TESTING

DETAILS/RESULTS/ACTIONS

TEST CONDITIONS

NOTE: Refer to the Wiring Diagrams for pin detail.

5 Measure the resistance between the:

• RCM C426 pin 9, circuit 15S-JA31 (GN/WH),

harness side and the inoperative air bag module
circuits.

• RCM C426 pin 10, circuit 91S-JA31 (BK/WH),

harness side and the inoperative air bag module
circuits.

• Are the resistances greater than 10,000 ohms?

ൺ

Yes

REPEAT the self-test, CLEAR the DTCs.
REACTIVATE the system.

ൺ

REPAIR the circuits. REPEAT the self-test,
CLEAR the DTCs. REACTIVATE the system.

PINPOINT TEST E : DTC B1049: PASSENGER SAFETY BELT PRETENSIONER CROSS LINK TO
ANOTHER FIRING CIRCUIT

DETAILS/RESULTS/ACTIONS

TEST CONDITIONS

E1: CHECK THE PASSENGER SAFETY BELT PRETENSIONER CIRCUITS

1 Deactivate the SRS.

2 Disconnect RCM C429.

3 Disconnect Passenger Side Underseat Occu-

pant Restraint Systems Simulator.

4 Disconnect Inoperative Air Bag Module Simu-

lator.

G401865en

501-20B-

Supplemental Restraint System

501-20B-

DIAGNOSIS AND TESTING

DETAILS/RESULTS/ACTIONS

TEST CONDITIONS

NOTE: Refer to the Wiring Diagrams for pin detail.

5 Measure the resistance between the:

• RCM C429 pin 9, circuit 91S-JA34 (BK/RD),

harness side and the inoperative air bag module
circuits.

• RCM C429 pin 10, circuit 15S-JA34 (GN/OG),

harness side and the inoperative air bag module
circuits.

• Are the resistances greater than 10,000 ohms?

ൺ

Yes

REPEAT the self-test, CLEAR the DTCs.
REACTIVATE the system.

ൺ

REPAIR the circuits. REPEAT the self-test,
CLEAR the DTCs. REACTIVATE the system.

PINPOINT TEST F : DTC B104B: DRIVER SIDE IMPACT SENSOR CROSS LINK TO ANOTHER
SENSOR

DETAILS/RESULTS/ACTIONS

TEST CONDITIONS

F1: CHECK FOR A CROSS LINK BETWEEN THE CRASH SENSOR AND THE DRIVER SIDE IMPACT
SENSOR

1 Deactivate the SRS.

2 Disconnect RCM C426.

3 Disconnect RCM C429.

4 Disconnect Crash Sensor C420.

5 Disconnect Driver Side Impact Sensor C427.

6 Measure the resistance between the RCM C426

pin 14, circuit 8-JA49 (WH), harness side and
the RCM C429 pin 26, circuit 8-JA39 (WH),
harness side.

• Is the resistance greater than 10,000 ohms?

ൺ

Yes

E64733

GO to F2.

ൺ

REPAIR circuit 8-JA39 (WH) and circuit 8-
JA49 (WH). REPEAT the self-test, CLEAR the
DTCs. REACTIVATE the system.

G401865en

501-20B-

Supplemental Restraint System

501-20B-

DIAGNOSIS AND TESTING

DETAILS/RESULTS/ACTIONS

TEST CONDITIONS

F2: CHECK FOR A CROSS LINK BETWEEN THE DRIVER SIDE IMPACT SENSOR CIRCUIT AND
THE PASSENGER SIDE IMPACT SENSOR CIRCUIT

1 Disconnect Passenger Side Impact Sensor

C428.

2 Measure the resistance between the RCM C429

pin 26, circuit 8-JA39 (WH), harness side and
the RCM C429 pin 29, circuit 8-JA40 (WH/VT),
harness side.

• Is the resistance greater than 10,000 ohms?

ൺ

Yes

E64734

REPEAT the self-test, CLEAR the DTCs.
REACTIVATE the system.

ൺ

REPAIR circuit 8-JA39 (WH) and circuit 8-
JA40 (WH/VT). REPEAT the self-test, CLEAR
the DTCs. REACTIVATE the system.

PINPOINT TEST G : DTC B104C: PASSENGER SIDE IMPACT SENSOR CROSS LINK TO ANOTHER
SENSOR

DETAILS/RESULTS/ACTIONS

TEST CONDITIONS

G1: CHECK FOR A CROSS LINK BETWEEN THE CRASH SENSOR AND THE PASSENGER SIDE
IMPACT SENSOR

1 Deactivate the SRS.

2 Disconnect RCM C426.

3 Disconnect RCM C429.

4 Disconnect Crash Sensor C420.

5 Disconnect Passenger Side Impact Sensor

C428.

G401865en

501-20B-

Supplemental Restraint System

501-20B-

DIAGNOSIS AND TESTING

Content .. 88 89 90 91 ..