PDC (park distance controle ) do not working when car in reverce; - rear lights work - fuse is not damaged -normaly the radio falls when pdc is in use , it don't work; - sensors are clean -on the display of the car comes : park help is not working .please go service what can be the problem .

parks dead outside and inside dimmer side both dead.
fuses are first. lacking the manual we check them all.
I must assume front and rear parks and side parks are all dead.
and will answer only for that fact
the front feed makes dash lamps work too.
rear end , optional has lamp outage module to fail ,. only rear.

I have the shop manual for all GC .
USA?
XJ jeep
park wiring all (aka , tail lamps or running lamps but are the same feed)
feed means power feed.
chapter 8w is wiring all
fuse box PDC fuse 13 good.
pdc fuse 17 good
pdc relay park good. BCM runs this relay so the park switch to it must be good.
only in auto lamps
manual lamps turned on BCM is not in that path and Fuse 17 feed lamps direct via the HL switch ON.

if fronts/and front sides are dead, Fuse 17 blew.
if not the HL switch is bad.
I won't say, all wires to above can fail, that be obvious.

The issue you have is that the 12v+ feed Times out after 20 mins or so, which will cause all your radio settings to revert to default. No matter which way round you switch the red/yellow on the stereo loom, you'll still have the same issue.
you need to splice the yellow cable to a solid 12v+ with constant power. there Is one in the passenger side footwell area coming in from the engine bay, but you will need to splice into it. The adaptor/interface generates an ignition feed for you (providing you have the correct kit)
There is nothing wrong with splicing into the OEM loom as long as you have a fuse in line of the cable and that it is soldered properly and secure.
I always re-loom using cloth tape.
Or maybe there is a wire missing :? Hence the Steering Controls wouldn't work, and no sounds from when Parking Sensors(PDC) enabled. Is it correct I won't get the chimes for the PDC until a working Patch Lead is installed? He told me the Stalk Controls and PDC are all interlinked

1 at USA drives left toe. (bingo)
it has 2, both are show in the operators guide, lost that>?
get one, not be stranded of silly things?
all answer usa
parks dead in rear of car and front parks
and all dash parks dead too? Dash is called dimmable illumintation
but is park. non the less,
so only th tails are dead?

$4 to read it here. or DL.
https://suzukipitstopplus.com/Category/3-suzuki-service-manuals.aspx

front cab box is in cab.
engine bay box PDC is in same.

the fsm shows fuse 10 , clearly marked, TAIL
did you look yet, or just want us to do that for you?>

when you turn on parks
fuse 10 feeds power to HL relay 1, and it closes with HL switch on , park , or full on.HL
this relay runs all parks, Front, rear and side, lights.

Same issue also when the fuse blows i looks my electric seat controls. I found the problem was underneath the hood underneath both the fuse boxes it was a power wire pinched under a plate that holds the fuse boxes on. This wire probably wore through after 140,000 miles of rubbing and being pinched. tell me if it works for you
Vehicle: 2003 impala

Cavity Fuse Description
1) 15 Amp Blue Horn Relay, Power Sunroof
Relay, Power Window Relay
2) 10 Amp Red Rear Fog Lights (Export Only)
3) 20 Amp Yellow Cigar Lighter
4) 10 Amp Red Headlight Low Beam Right
5) 10 Amp Red Headlight Low Beam Left
6) 20 Amp Yellow Body Control Module/Power Door Locks
7 )10 Amp Red Left Park Light/Left Tail Lamp/License Plate Lamp
8) Spare
9) 10 Amp Red Right Park Light/RightTail Lamp/License Plate Lamp/Cluster
10) Spare Cavity Fuse Description
11) 15 Amp Blue Flasher
12) 15 Amp Blue Stop Lights
13) 10 Amp Red Body Control Module/CMTC/Cluster/Pass. Airbag On,Off Indicator, Auto Daylight
Mirror/Light Bar Switch (Renegade Only)
14) 10 Amp Red PDC Fuel Pump/AC Clutch,
Starter Relay/Engine
Controller/Transmission
Controller (Diesel Only)
15) Spare
16) 20 Amp Yellow Power Outlet (Rear)
17) 15 Amp Blue Rear Wiper
18) 20 Amp Yellow Radio Choke & Relay
Cavity Fuse Description
19 20 Amp Yellow
Frt Fog Lights/Trailer Tow
Stop and Turn Lights
20 Spare
21 10 Amp Red Radio
22 20 Amp Yellow
Power Sunroof Relay/
Antenna Module (Export
Only)
23 Spare
24 10 Amp Red PDC Blower Motor
25 10 Amp Red Heated Seat Switches/HVAC
Control Head/Trailer Tow
Battery Charge
26 10 Amp Red Headlight High Beam Right
27 10 Amp Red Headlight High Beam Left
28 Spare
29 10 Amp Red Heated Mirrors/Rear Window
Defroster Indicator
Cavity Fuse Description
30 15 Amp Blue Heated Seat Module
31 Spare
32 10 Amp Red Wiper Switch/Front and
Rear Wipers
33 10 Amp Red SKIM Module/Data Link
Connector
34 15 Amp Blue Body Control Module/
Cluster/Interior Lights,
Hands Free Module/Radio/
CMTC/ITM Module & Siren
(Export Only)
35 Spare
36 10 Amp Red Airbag Control Module/
Occupation Classification
Module (Right Front Seat)
37 10 Amp Red Airbag Control Module
38 10 Amp Red ABS Controller/Shifter Assembly
39 10 Amp Red Hazard Flasher (Turn
Signals)/Backup Lamp
Switch (Manual Transmission
Only)/Transmission Range
Switch (Automatic Transmis

The fuse box diagram is a sticker placed on the inside of the fuse box cover. This cover is located on the left end of the instrument panel (driver side). The sticker just uses numbers to indicate the fuses. I will match the fuse number with its purpose:
1. Power Outlet, Front
2. Rear Fog Lights
3. Horns
4. Headlight, Low Beam, Right
5. Headlight, Low Beam, Left
6. Body Control Module / Power Door Locks
7. Spare
8. Spare
9. Right Park Light / Right Tail Light / Trailer Tow Lights / Cluster
10. Spare
11. Flasher
12. Stop Lights
13. Body Control Module / CMTC / Cluster
14. Spare
15. PDC Fuel Pump and Auto Shut Down Relays / SKIS
16. Power Outlet Rear
17. Rear Wiper
18. Radio Choke

Check ground at rear where harness grounds to frame. Brake lights are on a separate fuse. Also check fuse for park lamps.

# 18 for radio and it is a 20amp...see below for all #'s got to and amps... 1-20amp-pwr outlet frt. 2-10amp-rear fog lights(export only)
3-15 amp-horn 4-10amp-hedlt low beam rt
5-10amp-hedlt low beam lft 6-20amp-bodycontrolmodule/pwr dr locks 7-spare 8-spare 9-10amp- rt pk lt /rt tail lt/trailer tow lt/cluster
10-spare 11-15 amp-flasher 12-15 amp-stop lts
13-10amp-bodycontrolmodule/cmtc/cluster 14-spare
15-10amp-pdc fuel pmp & auto shutdownrelays/skis
16-20amp-pwr outlet rear 17-15amp-rear wiper 18-20amp-radio choke relay 19-20amp-frt fog lts/trailer tow stop and turn lts
20-20amp-sunroof 21-spare 22-10amp-wiperswitch/frt and rear washer 23-10amp-lft park lt/lft tail lt 24-10amp-pdc blower motor relay 25-10amp-heatseatswitch/hvac controlhead/trailor tow battery charge 26-10amp-hedlt highbeam rt 27-10amp-hedlt highbeam lft
28-spare 29-15amp-heated seat module 30-10amp-heated mirrors/rearwindowdefrosterindicator 31-20amp-cigarlighter
32-10amp-radio/frtdoorlockswitches/bodycontrolmodule
33-10amp-skis/diagnostic connector 34-15amp-cluster/courtesy lts/radio/bodycontrolmodule/maplights/cmtc/underhood lt/vanity lts
35-spare 36-10amp-ignition run/start-orc/lft and rt siacm
37-10amp-ignition run only-orc 38-10amp-abs module/brake shift interlock solenoid 39-10amp-rear window defroster relay/flasher/backup lts

There is normally a diagram printed onto the the inside of the fuse case.