Ford Galaxy / Ford S-MAX. Manual — part 907

GO to F4

.

No

REPAIR circuit CHS32A (BN), or circuit CHS32B
(BN), or circuit CHS32C (BN). TEST the system for
normal operation.

F4: CHECK THE INOPERATIVE HEATED SEAT MODULE GROUND CIRCUIT

Disconnect Inoperative Heated Seat Module.

1

NOTE: Carry out the measurements on the
inoperative seat.

Measure the resistance between the:

Front left heated seat module pin 2, circuit
GD149R (BK/GY), harness side and ground.
and
Front left heated seat module pin 4, circuit
GD149R (BK/GY), harness side and ground.

or

Front right heated seat module pin 2, circuit
GD151D (BK/GN), harness side and ground.
and
Front right heated seat module pin 4, circuit
GD151D (BK/GN), harness side and ground.

2

Are the resistances less than 5 ohms?
Yes

GO to F5

.

No

INSTALL a new seat wiring sub-harness. TEST the
system for normal operation.

F5: CHECK FOR CONTINUITY BETWEEN THE HEATED SEAT SWITCH AND THE
INOPERATIVE HEATED SEAT MODULE

NOTE: Carry out the measurements on the
inoperative seat.

Measure the resistance between the:

Front left heated seat module pin 3, circuit
CHS32A (BN), harness side and the heated seat
switch C3HS29 pin 2, circuit CHS32B (BN),
harness side.
or
Front right heated seat module pin 3, circuit
CHS32A (BN), harness side and the heated seat
switch C3HS29 pin 2, circuit CHS32B (BN),
harness side.

1

Is the resistance less than 5 ohms?
Yes

GO to F6

.

No

INSTALL a new seat wiring sub-harness. TEST the
system for normal operation.

F6: CHECK FOR VOLTAGE TO THE INOPERATIVE HEATED SEAT MODULE

Ignition switch in position II.

1

NOTE: Carry out the measurements on the
inoperative seat.

Measure the voltage between the:

Front left heated heated seat module pin 1,

2

harness side and ground.
Front right heated seat module pin 1, harness
side and ground.

Is the voltage greater than 10 volts?
Yes

GO to F7

.

No

INSTALL a new seat wiring sub-harness. TEST the
system for normal operation.

F7: CHECK THE INOPERATIVE HEATED SEAT BACKREST HEATER MAT FOR
CONTINUITY

Ignition switch in position 0.

1

Disconnect Inoperative Heated Seat Backrest.

2

NOTE: Carry out the measurements on the
inoperative seat.

Measure the resistance between the:

Left front heated seat backrest pin 1 and pin 2,
component side.
or
Right front heated seat backrest pin 1 and pin 2,
component side.

3

Is the resistance less than 5 ohms?
Yes

INSTALL a new heated seat module and cushion
heater mat. TEST the system for normal operation.

No

INSTALL a new heated seat backrest heater mat.
REFER to: Front Seat Backrest Heater Mat (501-10,
Removal and Installation).
TEST the system for normal operation.

PINPOINT TEST G : ALL CLIMATE CONTROLLED SEATS ARE
INOPERATIVE/DO NOT OPERATE CORRECTLY - FRONT SEAT

NOTE: Use a digital multimeter for all electrical measurements.

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

G1: CHECK FOR BATTERY VOLTAGE TO THE CLIMATE CONTROLLED SEAT RELAY

Disconnect Rear Junction Box Relay RB1.

1

Measure the voltage between the:

Rear junction box relay RB1 pin 1, circuit SBB19A
(BU/RD), harness side and ground.
and
Rear junction box relay RB1 pin 3, circuit SBB20P
(GN/RD), harness side and ground.

2

Is the voltage greater than 10 volts?

Yes

GO to G2

.

No

REPAIR circuit SBB19A (BU/RD) or circuit SBB20P
(GN/RD). TEST the system for normal operation.

G2: CHECK THE CLIMATE CONTROLLED SEAT RELAY GROUND CIRCUIT

Disconnect Central Junction Box (CJB) C1BP02-B.

1

Measure the resistance between the rear junction
box relay RB1 pin 2, circuit CDC03A (BU), harness

side and the CJB pin 45, circuit CDC03A (BU),
harness side.

2

Is the resistance less than 5 ohms?
Yes

INSTALL a new rear junction box relay RB1. If the
problem persists,

GO to G3

.

No

REPAIR circuit CDC03A (BU). TEST the system for
normal operation.

G3: CHECK FOR VOLTAGE TO THE INOPERATIVE CLIMATE CONTROLLED SEAT

Disconnect Inoperative Power Seat C3HS03 or
C3HS08.

1

Ignition switch in position II.

2

NOTE: Carry out the measurements on the
inoperative seat.

While operating the climate controlled seat switch,
measure the voltage between the:

Front left climate controlled seat C3HS03 pin 9,
circuit B_CBR03A (GY), harness side and ground.
or
Front right climate controlled seat C3HS08 pin 9,
circuit B_CBR04A (VT), harness side and ground.

3

Is the voltage greater than 10 volts?
Yes

GO to G5

.

No

GO to G4

.

G4: CHECK FOR CONTINUITY BETWEEN THE CLIMATE CONTROLLED SEAT RELAY AND
THE CLIMATE CONTROLLED SEAT

Measure the resistance between the:

Rear junction box relay RB1 pin 5, circuit
B_CBR03A (GY), harness side and the climate
controlled seat C3HS03 pin 9, circuit B_CBR03A
(GY), harness side.
and
Rear junction box relay RB1 pin 5, circuit
B_CBR04A (VT), harness side and the climate
controlled seat C3HS08 pin 9, circuit B_CBR04A
(VT), harness side.

1

Is the resistance less than 5 ohms?
Yes

GO to G5

.

No

REPAIR circuit B_CBR03A (GY) or circuit B_CBR04A
(VT). TEST the system for normal operation.

G5: CHECK THE INOPERATIVE CLIMATE CONTROLLED SEAT FOR GROUND

NOTE: Carry out the measurements on the
inoperative seat.

Measure the resistance between the:

Front left heated seat C3HS03 pin 10, circuit
GD134C (BK/VT), harness side and ground
(LHD).
and
Front left heated seat C3HS03 pin 10, circuit
GD140B (BK/GN), harness side and ground
(RHD).
or
Front right heated seat C3HS08 pin 10, circuit
GD140T (BK/GN), harness side and ground
(LHD).
and
Front right heated seat C3HS08 pin 10, circuit
GD134J (BK/VT), harness side and ground
(RHD).

1

Is the resistance less than 5 ohms?
Yes

GO to G6

.

No

REPAIR the relevant circuit

G6: CHECK FOR VOLTAGE TO THE CLIMATE CONTROLLED SEAT SWITCH

Disconnect Climate Controlled Seat Switch C3HS29.

1

Ignition switch in position II.

2

Measure the voltage between the:

Climate controlled seat switch C3HS29 pin 4,
circuit CBP04F (VT), harness side and ground.
and
Climate controlled seat switch C3HS29 pin 6,
circuit SBP07D (WH/RD), harness side and
ground.

3

Is the voltage greater than 10 volts?
Yes

GO to G7

.

No

REPAIR circuit CBP04F (VT) or circuit SBP07D
(WH/RD). TEST the system for normal operation.

G7: CHECK THE CLIMATE CONTROLLED SEAT SWITCH GROUND CIRCUIT

Measure the resistance between the climate
controlled seat switch C3HS29 pin 1, circuit

GD133AP (BK), harness side and ground.

1