2002 Citroen C5 both key fobs stopped opening and locking doors at same time

There are 2 types of fuse boxes in that year , check the numerous fuse related to c/locking

Fuse box diagram Citroen C5 2001-2008
Fuse box in passenger compartment.

fuse box location.





fuse box diagram (pre 2004 type 1).





Assignment of the fuses.

F1

(10A) Rear fog lamp, seat adjustment relay – driver's side, seat adjustment relay – passenger's side, sunroof motor

F2

(15A) Rear screen wiper motor

F3

–

F4

(15A) Door function control module – driver's side, door function control module – passenger's side

F5

(15A) LH stop lamp, stop lamp (high level)

F6

–

F7

(20A) Overhead console, interior lamp – rear, glove box lamp, AC/heater function control panel, cigarette lighter, accessories connector-front

F8

–

F9

(30A) Door function control module – driver's side, door function control module – passenger's side, sunroof motor

F10

(15A) Fuel additive injector, trailer socket, accessories connector- front, accessories connector- rear, suspension adjustment

F11

(15A) Engine control module (ECM) (RLZ), transmission control module (TCM), transmission gear position switch, steering column function control module, audio unit, navigation system control module, AC/heater function control panel, digital multifunction display, alarm system horn

F12

(10A) Transmission mode sensor, RH front side lamp, RH tail lamp, licence plate lamps, cigarette lighter, audio unit

F13

–

F14

(30A) Door function control module – driver's side, door function control module – passenger's side, central locking – front, fuel filler flap motor

F15

(30A) Central locking – rear, electric windows – rear

F16

(5A) Fuse box (engine bay 1), fuel additive control module, steering column function control module, SRS control module

F17

(10A) RH stop lamp

F18

(10A) Cruise control, automatic transmission (AT), data link connector (DLC), steering column function control module

F20

(10A) Audio unit, navigation system control module

F21

–

F22

(10A) LH front side lamp, LH tail lamp

F23

(15A) Suspension adjustment

F24

(15A) Instrument panel, digital multifunction display, AC/heater function control panel, parking aid control module

F25

–

F26

Heated rear windscreen

G36 (30A) Audio amplifier
G37 (30A) Electric driver's seat
G38 (30A) Electric front passenger's seat
G39 (30A) Heated driver's seat
G40 (30A) Heated front passenger's seat

Thank you very much whittingehame !
I have checked both F14 and F15 and tested them, and fuses are fine.
Not sure what else it might be, any suggestions would be appreciated.

Check F9 and F4 also

F4 and F9 are both fine also.

My wife's key fob suddenly started working this morning.
I bought some more new batteries, and replaced both just now in both fobs, and cleaned contacts inside with isopropyl , but my fob still does not work, tried to pair again, but no luck.

Something must have gone wrong with my fob circuit board so will get a new fob, at least the receiver part in the car does work.

Thank you for your help @whittingehame

That's good you have one at least one operating , thank you for updating the forum