Ford Galaxy / Ford S-MAX. Manual — part 972

REFER to:

Passenger Air Bag Module

(501-20B

Supplemental Restraint System, Removal and
Installation).
REPEAT the self-test, CLEAR the DTCs.
REACTIVATE the system.

P3: CHECK THE PASSENGER AIR BAG CIRCUIT FOR LOW RESISTANCE

Ignition switch in position 0.

1

Disconnect Passenger Air Bag Module Simulator.

2

Disconnect RCM C2R114-A.

3

Measure the resistance between the RCM
C2R114-A pin 9, circuit CR103A (GY/BU),

harness side and the RCM C2R114-A pin 10,
circuit RR103A (VT/GN), harness side.

4

Is the resistance greater than 10,000 ohms?
Yes

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

No

REPAIR circuit CR103A (GY/BU) and circuit
RR103A (VT/GN). REPEAT the self-test, CLEAR
the DTCs. REACTIVATE the system.

PINPOINT TEST Q : DTC B0050 12: DRIVER SAFETY BELT BUCKLE SWITCH
SHORT TO BATTERY

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

Q1: CHECK THE DRIVER SAFETY BELT BUCKLE SWITCH WIRING HARNESS FOR A
SHORT TO BATTERY

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.
NOTE: Use a digital multimeter for all electrical measurements.

Deactivate the SRS.

1

Disconnect Driver Underseat Air Bag Simulator.

2

Disconnect RCM C3R114.

3

Ignition switch in position II.

4

Measure the voltage between the:

The RCM C3R114 pin 25, circuit CR201A
(BU/OG), harness side and ground.
The RCM C3R114 pin 34, circuit RR155E (GY),
harness side and ground.

5

Is any voltage present?
Yes

REPAIR circuit CR201A (BU/OG) or circuit
RR155E (GY). REPEAT the self-test, CLEAR the

DTCs. REACTIVATE the system.

No

CONNECT the driver underseat air bag simulator
and RCM. REPEAT the self-test, CLEAR the DTCs.
REACTIVATE the system.

PINPOINT TEST R : DTC B0050 19: DRIVER SAFETY BELT BUCKLE SWITCH
CROSS LINK TO ANOTHER FIRING CIRCUIT

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

R1: CHECK THE DRIVER SAFETY BELT BUCKLE SWITCH CIRCUITS

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.
NOTE: Use a digital multimeter for all electrical measurements.

Deactivate the SRS.

1

Disconnect RCM C3R114.

2

Disconnect Driver Underseat Occupant Restraint Systems Simulator.

3

Disconnect Inoperative Air Bag Module Simulator.

4

NOTE: Refer to the Wiring Diagrams for pin detail.

Measure the resistance between the:

RCM C3R114 pin 25, circuit CR201A (BU/OG), harness side and the
inoperative air bag module circuits.
RCM C3R114 pin 34, circuit RR155C (GY), harness side and the
inoperative air bag module circuits.

5

Are the resistances greater than 10,000 ohms?
Yes

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

No

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

PINPOINT TEST S : DTC B0050 1E: DRIVER SAFETY BELT BUCKLE SWITCH
RESISTANCE OUT OF RANGE

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

S1: CHECK THE DRIVER SAFETY BELT BUCKLE SWITCH 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.
NOTE: Use a digital multimeter for all electrical measurements.

Deactivate the SRS.

1

Ignition switch in position II.

2

Carry out the self-test with the simulators
installed.

3

Does the system prove out correctly?
Yes

INSTALL a new driver safety belt buckle. REPEAT
the self-test, CLEAR the DTCs. REACTIVATE the
system.

No

GO to S2

.

S2: CHECK THE DRIVER SAFETY BELT BUCKLE SWITCH CIRCUIT CONTINUITY

Ignition switch in position 0.

1

Disconnect Driver Underseat Air Bag Simulator.

2

Measure the resistance between:

The driver safety belt buckle switch C33-L pin
13, circuit RR155E (GY), harness side and the
RCM C3R114 pin 34, circuit RR155E (GY),
harness side.
The driver safety belt buckle switch C33-L pin
14, circuit CR201A (BU/OG), harness side and
the RCM C3R114 pin 25, circuit CR201A
(BU/OG), harness side.

3

Are the resistances less than 5 ohms?
Yes

GO to S3

.

No

REPAIR circuit CR201A (BU/OG) or circuit RR155E
(GY). REPEAT the self-test, CLEAR the DTCs.
REACTIVATE the system.

S3: CHECK THE DRIVER SAFETY BELT BUCKLE SWITCH CIRCUIT FOR LOW
RESISTANCE

Measure the resistance between the RCM C3R114
pin 25, circuit CR201A (BU/OG), harness side and

the RCM C3R114 pin 34, circuit RR155C (GY),
harness side.

1

Is the resistance greater than 10,000 ohms?
Yes

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

No

REPAIR circuit CR201A (BU/OG) or circuit RR155C
(GY). REPEAT the self-test, CLEAR the DTCs.
REACTIVATE the system.

PINPOINT TEST T : DTC B0052 12: PASSENGER SAFETY BELT BUCKLE
SWITCH SHORT TO BATTERY

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

T1: CHECK THE PASSENGER SAFETY BELT BUCKLE SWITCH WIRING HARNESS FOR A
SHORT TO BATTERY

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.
NOTE: Use a digital multimeter for all electrical measurements.

Deactivate the SRS.

1

Disconnect Passenger Underseat Air Bag
Simulator.

2

Disconnect RCM C3R114.

3

Ignition switch in position II.

4

Measure the voltage between the:

5

The RCM C3R114 pin 30, circuit CR203A
(GY/VT), harness side and ground.
The RCM C3R114 pin 34, circuit RR155D (GY),
harness side and ground.

Is any voltage present?
Yes

REPAIR circuit CR203A (GY/VT) or circuit RR155D
(GY). REPEAT the self-test, CLEAR the DTCs.
REACTIVATE the system.

No

CONNECT the passenger underseat air bag
simulator and RCM. REPEAT the self-test, CLEAR
the DTCs. REACTIVATE the system.

PINPOINT TEST U : DTC B0052 19: PASSENGER SAFETY BELT BUCKLE
SWITCH CROSS LINK TO ANOTHER FIRING CIRCUIT

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

U1: CHECK THE PASSENGER SAFETY BELT BUCKLE SWITCH CIRCUITS

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.
NOTE: Use a digital multimeter for all electrical measurements.

Deactivate the SRS.

1

Disconnect RCM C3R114.

2

Disconnect Passenger Underseat Occupant Restraint Systems
Simulator.

3

Disconnect Inoperative Air Bag Module Simulator.

4

NOTE: Refer to the Wiring Diagrams for pin detail.

Measure the resistance between the:

RCM C3R114 pin 30, circuit CR203A (GY/VT), harness side and the
inoperative air bag module circuits.
RCM C3R114 pin 34, circuit RR155C (GY), harness side and the
inoperative air bag module circuits.

5

Are the resistances greater than 10,000 ohms?
Yes

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

No

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

PINPOINT TEST V : DTC B0052 1E: PASSENGER SAFETY BELT BUCKLE
SWITCH RESISTANCE OUT OF RANGE

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

V1: CHECK THE PASSENGER SAFETY BELT BUCKLE SWITCH 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