Ford Galaxy / Ford S-MAX. Manual — part 765

Exterior Lighting - Stoplamps

S-MAX/Galaxy 2006.5 (02/2006-)

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Diagnosis and Testing

Refer to Wiring Diagrams Section 417-01, for schematic and connector
information.

Special Tool(s)

Inspection and Testing

NOTE: The generic electronic module (GEM) is part of the central junction box (CJB).
NOTE: A new GEM needs to be configured after installation. For this purpose, the vehicle-
specific data are read out of the module to be changed using WDS and is transferred to
the new module. REFER to:

Module Configuration

(418-01 Module Configuration, General Procedures),

Generic Electronic Module (GEM)

(419-10 Multifunction Electronic Modules, Diagnosis and

Testing).

NOTE: A new PCM needs to be configured after installation. For this purpose, the vehicle-
specific data are read out of the module to be changed using WDS and is transferred to
the new module.
REFER to:

Module Configuration

(418-01 Module Configuration, General Procedures).

NOTE: Before reading out the vehicle-specific data make sure that all electrical
connections in the vehicle are reconnected so that the module and WDS can communicate
correctly.

1. 1. Verify the customer concern.

2. 2. Visually inspect for obvious signs of electrical (or mechanical) damage.

Visual Inspection Chart

3. 3. Resolve any obvious causes or concerns found during the visual inspection before

carrying out any further tests.

4. 4. If the cause of the concern cannot be found by visual inspection, continue with the

symptom chart.

Symptom chart

Symptom chart

Terminal Probe Kit

29-011A

Mechanical

Electrical

stoplamp switch adjustment

Fuse(s)

Bulb(s)

Connector

Switch

Wiring loom

Symptom

Possible Sources

Action

The Stoplamps Are Inoperative

Fuse
Circuit(s)
Stoplamp switch
Smart Junction Box

*
*
*
*

GO to Pinpoint

Test

A.

*

Pinpoint test

NOTE: Use a digital multimeter for all electrical measurements.

ONE OR MORE STOPLAMPS ARE
INOPERATIVE

Circuit(s)
Rear lamp assembly
Additional high-mounted

stoplamp

Smart Junction Box

*
*
*

*

GO to Pinpoint

Test

B.

*

One or more stoplamps inoperative

Circuit(s)
Stoplamp switch
Smart Junction Box
Trailer socket

*
*
*
*

GO to Pinpoint

Test

C.

*

PINPOINT TEST A : THE STOPLAMPS ARE INOPERATIVE

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

A1: CHECK FUSE F28 (5 A) (SJB)

Ignition switch in position 0.

1

Disconnect Fuse F28 (5 A) (SJB).

2

CHECK Fuse F28 (5 A) (SJB).

3

Is the fuse OK.?
Yes

GO to A2

.

No

RENEW fuse F28 (5 A) (SJB) and CHECK the
operation of the system. If the fuse blows again,
LOCATE and RECTIFY the short to ground using the
Wiring Diagrams. CHECK system operates correctly

A2: CHECK THE VOLTAGE SUPPLY TO FUSE F28 (5 A) (SJB) FOR OPEN CIRCUIT

Connect Fuse F28 (5 A) (SJB).

1

Ignition switch in position II.

2

Measure the voltage between fuse F28 (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 to fuse F28 (5 A) (SJB) with the aid of the
Wiring Diagrams. CHECK system operates correctly

A3: CHECK THE VOLTAGE SUPPLY TO THE STOPLAMP SWITCH FOR OPEN CIRCUIT

Ignition switch in position 0.

1

Disconnect Stoplamp switch from connector
C2CA29.

2

Ignition switch in position II.

3

Measure the voltage between the stoplamp switch,
connector C2CA29, pin 1, circuit SBP28A (GN/RD),

wiring harness side and ground.

4

Does the meter display battery voltage?
Yes

GO to A5

.

No

GO to A4

.

A4: RULE OUT THE SMART JUNCTION BOX AS A POSSIBLE CAUSE OF THE FAULT

Ignition switch in position 0.

1

Disconnect Smart Junction Box from connector
C1BP02B.

2

Measure the resistance between the stoplamp
switch, connector C2CA29, pin 1, circuit SBP28A

(GN/RD), wiring harness side and the Smart
Junction Box, connector C1BP02B, pin 66, circuit
SBP28A (GN/RD), 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 stoplamp
switch with the aid of the Wiring Diagrams. CHECK
system operates correctly

A5: RULE OUT THE STOPLAMP SWITCH AS THE CAUSE OF THE FAULT

Ignition switch in position 0.

1

Use a fused jumper lead (5 A) to connect the
stoplamp switch, connector C2CA29, between pin

2, circuit CCA29C (GN/BU) and pin 1, circuit
(GN/RD), wiring harness side.

2

Ignition switch in position II.

3

Check the stoplamps.

4

Do the stoplamps come on?
Yes

RENEW the stoplamp switch. CHECK system
operates correctly

No

GO to A6

.

A6: CHECK THE CIRCUIT BETWEEN THE STOPLAMP SWITCH AND THE SMART
JUNCTION BOX FOR OPEN CIRCUIT

Ignition switch in position 0.

1

Disconnect Smart Junction Box from connector
C1BP02B.

2

Measure the resistance between the stoplamp
switch, connector C2CA29, pin 2, circuit CCA29C

(GN/BU), wiring harness side and the Smart
Junction Box, connector C1BP02B, pin 54, circuit
CCA29C (GN/BU), wiring harness side.

3

Is a resistance of less than 2 Ohm registered?
Yes

CHECK the Smart Junction Box and INSTALL A NEW
ONE if required. CHECK system operates correctly

No

LOCATE and RECTIFY the break in the circuit
between the stoplamp switch and the Smart
Junction Box with the aid of the Wiring Diagrams.

CHECK system operates correctly

PINPOINT TEST B : ONE OR MORE STOPLAMPS ARE INOPERATIVE

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

B1: DETERMINE CONDITIONS UNDER WHICH THE FAULT OCCURS

Ignition switch in position 0.

1

Disconnect Stoplamp switch from connector
C2CA29.

2

Use a fused jumper lead (5 A) to connect the
stoplamp switch, connector C2CA29, between pin

1, circuit SBP28A (GN/RD) and pin 2, circuit
CCA29C (GN/BU), wiring harness side.

3

Ignition switch in position II.

4

Check the stoplamps.

5

Is only the high mounted stoplamp inoperative?
Yes

GO to B2

.

No

- Left-hand stoplamp and additional high-mounted
stoplamp inoperative: LOCATE and RECTIFY the
break in the circuit between soldered connection
SP549 and ground connection G4D149 with the aid
of the Wiring Diagrams. CHECK system operates
correctly
- Left-hand stoplamp and right-hand stoplamp
inoperative:

GO to B5

.

- Left-hand stoplamp inoperative:

GO to B6

.

- Right-hand stoplamp inoperative:

GO to B8

.

B2: CHECK THE VOLTAGE SUPPLY OF THE ADDITIONAL HIGH-MOUNTED STOPLAMP
FOR OPEN CIRCUIT

NOTE: The fused jumper lead remains connected during this test step.

Ignition switch in position 0.

1

Disconnect Additional high-mounted stoplamp from
connector C4LS50.

2

Ignition switch in position II.

3

Measure the voltage between the additional high-
mounted stoplamp, connector C4LS50, pin 1,

circuit CLS17A (YE/GY), wiring harness side and
ground.

4

Does the meter display battery voltage?
Yes

GO to B3

.

No

GO to B4

.

B3: CHECK THE GROUND CONNECTION OF THE ADDITIONAL HIGH-MOUNTED