Ford Galaxy / Ford S-MAX. Manual — part 764

Measure the voltage between fuse F1 (5 A) (CJB)
and ground.

3

Does the meter display battery voltage?
Yes

GO to A4

.

No

RENEW THE CJB. CHECK the operation of the
system.

A4: CHECK VOLTAGE SUPPLY TO RAIN SENSOR FOR OPEN CIRCUIT

Ignition switch in position 0.

1

Disconnect Rain sensor from connector C9RW06.

2

Ignition switch in position II.

3

Measure the voltage between the rain sensor,
connector C9RW06, pin 3, circuit CBP01B (BU),

wiring harness side and ground.

4

Does the meter display battery voltage?
Yes

GO to A6

.

No

GO to A5

.

A5: CHECK CIRCUIT CBP01B (BU) BETWEEN CENTRAL JUNCTION BOX (CJB) AND
RAIN SENSOR FOR OPEN CIRCUIT

Ignition switch in position 0.

1

Disconnect CJB from connector C1BP02H.

2

Measure the resistance between the CJB,
connector C1BP02H, pin 17, circuit CBP01B (BU),

wiring harness side and the rain sensor, connector
C9RW06, pin 3, circuit CBP01B (BU), wiring
harness side.

3

Is a resistance of less than 2 Ohms registered?
Yes

RENEW THE CJB. CHECK the operation of the
system.

No

LOCATE and RECTIFY the break in the circuit
between CJB and the rain sensor using the Wiring
Diagrams. CHECK the operation of the system.

A6: CHECK GROUND CONNECTION OF RAIN SENSOR FOR OPEN CIRCUIT

Ignition switch in position 0.

1

Measure the resistance between the rain sensor,
connector C9RW06, pin 2, circuit GD138V(BK/WH),

wiring harness side and ground.

2

Is a resistance of less than 2 Ohms registered?
Yes

GO to A7

.

No

LOCATE and RECTIFY the break in the circuit
between the rain sensor and soldered connection
SP523 using the Wiring Diagrams. CHECK the
operation of the system.

A7: CHECK CIRCUIT (LIN 2 BUS) VRW26A (BN/YE) BETWEEN THE GENERIC
ELECTRONIC MODULE (GEM) AND THE RAIN SENSOR FOR SHORT CIRCUIT TO
BATTERY VOLTAGE

Disconnect GEM from connector C1BP02H.

1

Ignition switch in position II.

2

Measure the voltage between the rain sensor,
connector C9RW06, pin 1, circuit VRW26A (BN/YE),

wiring harness side and ground.

3

Does the meter display battery voltage?
Yes

LOCATE and RECTIFY the short to battery voltage
in the circuit between the (GEM) and the rain
sensor using the Wiring Diagrams. CHECK the
operation of the system.

No

GO to A8

.

A8: CHECK CIRCUIT (LIN 2 BUS) VRW26A (BN/YE) BETWEEN THE GENERIC
ELECTRONIC MODULE (GEM) AND THE RAIN SENSOR FOR SHORT CIRCUIT TO
GROUND

Ignition switch in position 0.

1

Measure the resistance between the rain sensor,
connector C9RW06, pin 1, circuit VRW26A (BN/YE),

wiring harness side and ground.

2

Is a resistance of more than 10,000 Ohm measured?
Yes

GO to A9

.

No

LOCATE and RECTIFY the short to ground in the
circuit between the GEM and the rain sensor using
the Wiring Diagrams. CHECK the operation of the
system.

A9: CHECK CIRCUIT (LIN 2 BUS) VRW26A (BN/YE) BETWEEN THE GENERIC
ELECTRONIC MODULE (GEM) AND THE RAIN SENSOR FOR OPEN CIRCUIT

Measure the resistance between the GEM,
connector C1BP02H, pin 8, circuit VRW26A

(BN/YE), wiring harness side and the rain sensor,
connector C9RW06, pin 1, circuit VRW26A (BN/YE),
wiring harness side.

1

Is a resistance of less than 2 Ohms registered?
Yes

RENEW rain sensor. CHECK the operation of the
system. If the concern persists, CHECK the CJB
using WDS, RENEW if necessary. CHECK the
operation of the system.

No

LOCATE and RECTIFY the break in the circuit
between GEM and the rain sensor using the Wiring
Diagrams. CHECK the operation of the system.

PINPOINT TEST B : AUTOMATIC HEADLAMPS ARE ON PERMANENTLY
(LIGHTING CONTROL MODULE IN OFF POSITION)

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

B1: DETERMINE THE CONDITIONS UNDER WHICH THE FAULT OCCURS

NOTE: For this test step, the rain sensor must be exposed to sufficient light.

Ignition switch in position II.

1

Cover the rain sensor with opaque material.

2

CHECK the dipped beam (automatic headlamps).

3

Remove the opaque cover from the rain sensor.

4

CHECK the dipped beam (automatic headlamps).

5

Does the dipped beam (automatic headlamps) illuminate in both lighting
conditions?
Yes

GO to B2

.

No

RENEW rain sensor. CHECK the operation of the system.

B2: RULE OUT THE RAIN SENSOR AS THE CAUSE OF THE FAULT

Ignition switch in position 0.

1

Disconnect Fuse F1 (5 A) (CJB).

2

Ignition switch in position II.

3

CHECK the dipped beam (automatic headlamps).

4

Is the dipped beam (automatic headlamps) on permanently?
Yes

Check the CJB using WDS. CHECK the operation of the system. If the
concern persists:
REFER to:

Headlamps

(417-01 Exterior Lighting, Diagnosis and

Testing).

No

RENEW rain sensor. CHECK the operation of the system.