Ford Galaxy / Ford S-MAX. Manual — part 777

Pinpoint test

NOTE: Use a digital multimeter for all electrical measurements.

Trailer socket

*

PINPOINT TEST A : THE BACKUP LAMPS ARE INOPERATIVE

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

A1: CHECK FUSE F11 (7.5 A) (SJB)

Ignition switch in position 0.

1

Disconnect Fuse F11 (7.5 A) (SJB).

2

CHECK Fuse F11 (7.5 A) (SJB).

3

Is the fuse OK.?
Yes

GO to A2

.

No

INSTALL A NEW fuse F11 (7.5 A) (SJB). CHECK
system operates correctly If the fuse blows again,
LOCATE and RECTIFY short using the Wiring
Diagrams. CHECK system operates correctly

A2: CHECK THE VOLTAGE SUPPLY TO FUSE F11 (7.5 A) (SJB) FOR OPEN CIRCUIT

Connect Fuse F11 (7.5 A) (SJB).

1

Ignition switch in position II.

2

Measure the voltage between fuse F11 (7.5 A)
(SJB) and ground.

3

Does the meter display battery voltage?
Yes

GO to A3

.

No

LOCATE AND RECTIFY the break in the voltage
supply of fuse F11 (7.5 A) (SJB) using the Wiring
Diagrams. CHECK system operates correctly

A3: RULE OUT THE BACKUP LAMP SWITCH AS A POSSIBLE CAUSE OF THE FAULT

Ignition switch in position 0.

1

Disconnect Backup lamp switch from.

Manual transmission (SIGMA): Connector
C1ET47B

Manual transmission (all other variants):
Connector C1ET47A

2

Manual transmission (SIGMA): Connect a fused (5
A) jumper lead at the backup lamp switch,

connector C1ET47B, between pin 1, circuit (BU),
wiring harness side and ground.

3

Manual transmission (all other variants): Connect a
fused jumper lead (5 A) at the backup lamp switch,

connector C1ET47A, between pin 1, circuit (BU),
wiring harness side and pin 2, circuit GD120S
(BK/GN) / GD120B (BK/GN), wiring harness side.

4

Ignition switch in position II.

5

Are the backup lamps illuminated?

Yes

INSTALL A NEW backup lamp switch. CHECK
system operates correctly

No

- Manual transmission (SIGMA):

GO to A5

.

- Manual transmission (all other variants):

GO to

A4

.

A4: CHECK THE GROUND CONNECTION OF THE BACKUP LAMP SWITCH FOR OPEN
CIRCUIT

Ignition switch in position 0.

1

Measure the resistance between the backup lamp
switch, connector C1ET47A, pin 2, circuit GD120S

(BK/GN) / GD120B (BK/GN), wiring harness side
and ground.

2

Is a resistance of less than 2 Ohm registered?
Yes

GO to A5

.

No

LOCATE and RECTIFY the break in the circuit
between the backup lamp switch and soldered
connection SP358 using the Wiring Diagrams.
CHECK system operates correctly

A5: CHECK THE CIRCUIT BETWEEN THE SMART JUNCTION BOX AND THE BACKUP
LAMP SWITCH FOR OPEN CIRCUIT

Ignition switch in position 0.

1

Disconnect Smart Junction Box from connector
C1BP02A.

2

Connect Backup lamp switch to.

Manual transmission (SIGMA): Connector
C1ET47B

Manual transmission (all other variants):
Connector C1ET47A

3

ENGAGE the reverse gear.

4

Measure the resistance between the Smart
Junction Box, connector C1BP02A, pin 26, circuit

CET47B (BU), wiring harness side and ground.

5

Is a resistance of less than 2 Ohm registered?
Yes

GO to A6

.

No

LOCATE and RECTIFY the break in the circuit
between the Smart Junction Box and the backup
lamp switch with the aid of the Wiring Diagrams.
CHECK system operates correctly

A6: CHECK THE SHARED GROUND OF THE BACKUP LAMPS FOR OPEN CIRCUIT

Disconnect Left-hand rear lamp assembly from
connector C4LS35.

1

Measure the resistance between the left-hand rear
lamp assembly (tailgate), connector C4LS35, pin 2,

2

circuit GD150P (BK/WH), wiring harness side and
ground.

Is a resistance of less than 2 Ohm registered?
Yes

INSTALL A NEW Smart Junction Box. CHECK
system operates correctly

No

LOCATE and RECTIFY the break in the circuit
between soldered connection SP534 and ground
connection G4D149 with the aid of the Wiring
Diagrams. CHECK system operates correctly

PINPOINT TEST B : ONE BACKUP LAMP IS INOPERATIVE

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

B1: DETERMINE CONDITIONS UNDER WHICH THE FAULT OCCURS

Ignition switch in position II.

1

ENGAGE the reverse gear.

2

CHECK the backup lamps.

3

Is the left-hand backup lamp inoperative?
Yes

GO to B2

.

No

Right-hand backup lamp inoperative:

GO to B5

.

B2: CHECK THE POWER SUPPLY OF THE LEFT-HAND TAILGATE LAMP ASSEMBLY FOR
OPEN CIRCUIT

Ignition switch in position 0.

1

Disconnect Left-hand tailgate lamp assembly from
connector C4LS35.

2

Ignition switch in position II.

3

ENGAGE reverse gear.

4

Measure the voltage between the left-hand tailgate
lamp assembly, connector C4LS35, pin 4, circuit

A_CLS10A (GN/BN), wiring harness side and
ground.

5

Does the meter display battery voltage?
Yes

GO to B4

.

No

GO to B3

.

B3: CHECK THE POWER SUPPLY OF THE LEFT-HAND TAILGATE LAMP ASSEMBLY FOR
OPEN CIRCUIT

Ignition switch in position 0.

1

Disconnect Smart Junction Box from connector
C1BP02B.

2

Measure the resistance between the Smart
Junction Box, connector C1BP02B, pin 73, circuit

A_CLS10B (GN/BN), wiring harness side and the
left-hand tailgate lamp assembly, connector
C4LS35, pin 4, circuit A_CLS10A (GN/BN), wiring
harness side.

3

Is a resistance of less than 2 Ohm registered?
Yes

INSTALL A NEW Smart Junction Box. CHECK
system operates correctly

No

LOCATE and RECTIFY the break in the circuit
between the Smart Junction Box and the tailgate
lamp assembly with the aid of the Wiring Diagrams.
CHECK system operates correctly

B4: CHECK THE GROUND CONNECTION OF THE LEFT-HAND TAILGATE LAMP
ASSEMBLY FOR OPEN CIRCUIT

Ignition switch in position 0.

1

Measure the resistance between the left-hand
tailgate lamp assembly, connector C4LS35, pin 2,

circuit GD150P (BK/WH), wiring harness side and
ground.

2

Is a resistance of less than 2 Ohm registered?
Yes

INSTALL A NEW tailgate lamp unit. CHECK system
operates correctly

No

LOCATE and RECTIFY the break in the circuit
between the tailgate lamp unit and soldered
connection SP534 with the aid of the Wiring
Diagrams. CHECK system operates correctly

B5: CHECK THE POWER SUPPLY OF THE RIGHT-HAND TAILGATE LAMP ASSEMBLY FOR
OPEN CIRCUIT

Ignition switch in position 0.

1

Disconnect Right-hand tailgate lamp assembly
from connector C4LS36.

2

Ignition switch in position II.

3

ENGAGE the reverse gear.

4

Measure the voltage between the right-hand
tailgate lamp assembly, connector C4LS36, pin 4,

circuit CLS10A (GN/BN), wiring harness side and
ground.

5

Does the meter display battery voltage?