Ford Galaxy / Ford S-MAX. Manual — part 654

side.

Is a resistance of less than 2 Ohms registered?
Yes

CHECK RJB and RENEW if necessary. CHECK the
operation of the system.

No

LOCATE and RECTIFY the break in the circuit
between the RJB and the auxiliary climate control
module using the Wiring Diagrams. CHECK the
operation of the system.

B7: CHECK THE GROUND CONNECTION OF THE AUXILIARY CLIMATE CONTROL
MODULE

Measure the resistance between the auxiliary climate
control module, connector C3H101-A, pin 10, circuit

GD150L (BK/WH), wiring harness side and ground.

1

Is a resistance of less than 2 Ohms registered?
Yes

GO to B8

.

No

LOCATE and RECTIFY the break in the circuit
between the auxiliary climate control module and
ground connection G4D149 using the Wiring
Diagrams. CHECK the operation of the system.

B8: CHECK VOLTAGE AT AUXILIARY CLIMATE CONTROL EVAPORATOR TEMPERATURE
SENSOR

Disconnect Connector C4HA30 from auxiliary climate
control evaporator temperature sensor.

1

Ignition switch in position II.

2

SWITCH ON auxiliary climate control.

3

Measure the voltage between the auxiliary climate
control evaporator temperature sensor, connector

C4HA30, pin 1, circuit VHA30A (BN/YE), wiring
harness side and ground.

4

Is a voltage of approx. 5 volts measured?
Yes

GO to B11

.

No

- The voltage measured is more than 6 Volts:LOCATE
and RECTIFY the short to voltage in circuit VHA30A
(BN/YE) between the auxiliary climate control module
and the auxiliary climate control evaporator
temperature sensor using the Wiring Diagrams.
CHECK the operation of the system.
- No voltage measured:

GO to B9

.

B9: CHECK THE CIRCUIT BETWEEN THE AUXILIARY CLIMATE CONTROL EVAPORATOR
TEMPERATURE SENSOR AND THE AUXILIARY CLIMATE CONTROL MODULE FOR

SHORT CIRCUIT TO GROUND

Ignition switch in position 0.

1

Disconnect Connector C3H101-R from auxiliary
climate control module.

2

Measure the resistance between the auxiliary climate
control evaporator temperature sensor, connector

C4HA30, pin 1, circuit VHA30A (BN/YE), wiring
harness side and ground.

3

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

GO to B10

.

No

LOCATE and RECTIFY the short to ground in circuit
VHA30A (BN/YE) between the auxiliary climate
control module and the auxiliary climate control
evaporator temperature sensor using the Wiring
Diagrams. CHECK the operation of the system.

B10: CHECK THE CIRCUIT BETWEEN THE AUXILIARY CLIMATE CONTROL
EVAPORATOR TEMPERATURE SENSOR AND THE AUXILIARY CLIMATE CONTROL
MODULE FOR OPEN CIRCUIT

Measure the resistance between the auxiliary climate
control evaporator temperature sensor, connector

C4HA30, pin 1, circuit VHA30A (BN/YE), wiring
harness side and auxiliary climate control module,
connector C3H101-R, pin 5, wiring harness side.

1

Is a resistance of less than 2 Ohms registered?
Yes

CHECK the auxiliary climate control module using
WDS, RENEW if necessary.

No

LOCATE and RECTIFY the break in circuit VHA30A
(BN/YE) between the auxiliary climate control
evaporator temperature sensor and the auxiliary
climate control module using the Wiring Diagrams.
CHECK the operation of the system.

B11: CHECK GROUND CONNECTION FROM AUXILIARY CLIMATE CONTROL
EVAPORATOR TEMPERATURE SENSOR

Ignition switch in position 0.

1

Measure the resistance between the auxiliary climate
control evaporator temperature sensor, connector

C4HA30, pin 2, circuit RHA26A (BU/WH), wiring
harness side and ground.

2

Is a resistance of less than 2 Ohms registered?
Yes

RENEW auxiliary climate control evaporator
temperature sensor. CHECK the operation of the
system.

No

GO to B12

.

B12: CHECK THE CIRCUIT BETWEEN THE AUXILIARY CLIMATE CONTROL
EVAPORATOR TEMPERATURE SENSOR AND THE AUXILIARY CLIMATE CONTROL
MODULE FOR OPEN CIRCUIT

Disconnect Connector C3H101-R from auxiliary
climate control module.

1

Measure the resistance between the auxiliary climate
control evaporator temperature sensor, connector

C4HA30, pin 2, circuit RHA26A (BU/WH), wiring
harness side and auxiliary climate control module,
connector C3H101-R, pin 15, wiring harness side.

2

Is a resistance of less than 2 Ohms registered?
Yes

GO to B13

.

No

LOCATE and RECTIFY the break in circuit RHA26A
(BU/WH) between the auxiliary climate control
evaporator temperature sensor and the auxiliary
climate control module using the Wiring Diagrams.
CHECK the operation of the system.

B13: CHECK VOLTAGE AT EXPANSION/CUT-OUT VALVE

Ignition switch in position 0.

1

Connect Connector C3H101-R from auxiliary climate
control module.

2

Disconnect Connector C4HA28 from expansion/cut-
out valve.

3

Ignition switch in position II.

4

Measure the voltage between the expansion/cut-out
valve, connector C4HA28, pin 2, circuit CHA28A

(VT/OG), wiring harness side and ground.

5

Does the meter display battery voltage?
Yes

GO to B16

.

No

GO to B14

.

B14: CHECK THE CIRCUIT BETWEEN THE EXPANSION/CUT-OUT VALVE AND THE
AUXILIARY CLIMATE CONTROL MODULE FOR SHORT CIRCUIT TO GROUND

Ignition switch in position 0.

1

Disconnect Connector C3H101-R from auxiliary
climate control module.

2

Measure the resistance between the expansion/cut-
out valve, connector C4HA28, pin 2, circuit CHA28A

(VT/OG), wiring harness side and ground.

3

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

GO to B15

.

No

LOCATE and RECTIFY the short to ground in circuit
CHA28A (VT/OG) between the auxiliary climate
control module and the expansion/cut-out valve
using the Wiring Diagrams. CHECK the operation of
the system.

B15: CHECK THE CIRCUIT BETWEEN THE EXPANSION/CUT-OUT VALVE AND THE
AUXILIARY CLIMATE CONTROL MODULE FOR OPEN CIRCUIT

Measure the resistance between the expansion/cut-
out valve, connector C4HA28, pin 2, circuit CHA28A

(VT/OG), wiring harness side and auxiliary climate

1

control module, connector C3H101-R, pin 11, wiring
harness side.

Is a resistance of less than 2 Ohms registered?
Yes

CHECK the auxiliary climate control module using
WDS, RENEW if necessary.

No

LOCATE and RECTIFY the break in circuit CHA28A
(VT/OG) between the expansion/cut-out valve and
the auxiliary climate control module using the Wiring
Diagrams. CHECK the operation of the system.

B16: CHECK GROUND CONNECTION FROM EXPANSION/CUT-OUT VALVE

Ignition switch in position 0.

1

Measure the resistance between the expansion/cut-
out valve, connector C4HA28, pin 1, circuit RHA29A

(WH/VT), wiring harness side and ground.

2

Is a resistance of less than 2 Ohms registered?
Yes

RENEW expansion/cut-out valve. CHECK the
operation of the system.

No

GO to B17

.

B17: CHECK THE CIRCUIT BETWEEN THE EXPANSION/CUT-OUT VALVE AND THE
AUXILIARY CLIMATE CONTROL MODULE FOR OPEN CIRCUIT

Disconnect Connector C3H101-R from auxiliary
climate control module.

1

Measure the resistance between the expansion/cut-
out valve, connector C4HA28, pin 1, circuit RHA29A

(WH/VT), wiring harness side and auxiliary climate
control module, connector C3H101-R, pin 10, wiring
harness side.

2

Is a resistance of less than 2 Ohms registered?
Yes

CHECK the auxiliary climate control module using
WDS, RENEW if necessary.

No

LOCATE and RECTIFY the break in circuit RHA29A
(WH/VT) between the expansion/cut-out valve and
the auxiliary climate control module using the Wiring
Diagrams. CHECK the operation of the system.

PINPOINT TEST C : MALFUNCTION - AUXILIARY CLIMATE CONTROL
TEMPERATURE CONTROL FLAP

NOTE: Ensure that the auxiliary climate control temperature control flap is mechanically
OK.

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

C1: CHECK VOLTAGE AT AUXILIARY CLIMATE CONTROL TEMPERATURE CONTROL
FLAP ACTUATOR

Ignition switch in position 0.

1

Disconnect Connector C4HA20 from auxiliary climate
control temperature control flap actuator.

2

Ignition switch in position II.

3

SWITCH ON auxiliary climate control.

4

Measure the voltage between the auxiliary climate
control temperature control flap actuator, connector

C4HA20, pin 2, circuit CHA24A (WH/GN), wiring
harness side and ground.

5