Hi. I have a C320 mercedes. the signal lights, wipers,horn do not work . T I can noot change the function on the electronic cluster either. I replace the front SAM unit and it did not fix the proplems

Who replaced the headlamp bulb ? Take it back . Everything your having problems with are all controlled by the BCM - body control module . May have crossed wire's ,shorted etc....
This vehicles BCM functions as the Power Mode Master (PMM). Refer to Power Mode Description and Operation for a complete description of the power mode functions.
Body Control Module
The various body control module (BCM) input and output circuits are described in the corresponding functional areas indicated on the BCM electrical schematics. The BCM functions include the following:
• Battery rundown protection--Inadvertent power--Refer to Interior Lighting Systems Description and Operation .
• BTSI/automatic transmission shift lock control--Refer to Automatic Transmission Shift Lock Control Description and Operation .
• Bulb check--Refer to Instrument Cluster Description and Operation .
• Chimes--Refer to Audible Warnings Description and Operation .
- Check gages
- Content theft deterrent
- Door ajar warning
- Headlamps ON
- Key-in-ignition
- Oil reset
- Park brake warning
- Seat belt not fastened
- Turn signal ON
- Vehicle theft deterrent
• Door lock interface--Refer to Power Door Locks Description and Operation .
• Exterior and interior lighting control--Refer to Exterior Lighting Systems Description and Operation .
- Automatic lighting control
- Backup lamps
- Daytime running lights (DRL)
- Fog lamps
- High/low beam head lamps
- Park brake lights
- Turn hazard lamps
• Gage control--Refer to Instrument Cluster Description and Operation .
• Heated seats--Refer to Heated Seats Description and Operation .
• Horn interface--Refer to Horns System Description and Operation .
• Instrument cluster indicator control--Refer to Instrument Cluster Description and Operation .
• Interior lighting--Refer to Interior Lighting Systems Description and Operation .
• Key-in-ignition sensing--Refer to Audible Warnings Description and Operation .
• Parking brake state sensing--Refer to Brake Warning System Description and Operation .
• Retained accessory power (RAP)--Refer to Retained Accessory Power (RAP) Description and Operation .
• Rear compartment interface--Refer to Power Door Locks Description and Operation .
• Rear defogger--Refer to Rear Window Defogger Description and Operation .
• Remote function control--Refer to Keyless Entry System Description and Operation .
• RFA communication link--Refer to Keyless Entry System Description and Operation .
• Seat belt use sensing--Refer to Seat Belt System Description and Operation .
• Theft deterrent vehicle/content--Refer to Content Theft Deterrent (CTD) Description and Operation or Immobilizer Description and Operation .
• Washer solvent level sensing--Refer to Wiper/Washer System Description and Operation .
• Wiper/washer--Refer to Wiper/Washer System Description and Operation .

Since most are unrelated. Check the fuse for the wipers, replace the motor. Replace the regulator for the window, Check the fuse for the horn, most likely it is the steering wheel button bad, if you have lights for the radio and A/C, pull the IP and check wiring and plugs for corrosion. Replace the door latch and the light and chime will stop.

most likely a bad switch, the turn signal lever/stalk is the switch for all three functions, wiper, wash, turn signal.

All the thing's your having problems with are controlled by the computer's an communication network . (FEM) - front electronic module , insturment cluster , (REM) - rear electronic module. etc... It's probably a loose ground connection somewhere . The headlamp switch is a electronic input to the insturment cluster , the insturment cluster is hooked to the SCP - serial data network . The insturment cluster electronic's (computer ) microprocessor sends a message to the (FEM) to turn on light's , the front electronic module will then suppy a ground to the headlamps circuit turnning on the headlamps. Samething for the wipers an turn signals an horn too .
010 Ford SCP Communications
From looking at a wiring diagram i would look at ground connection G-304 . Do you know what a body ground is ?
This ground is located How to troubleshoot headlights intermittently on and off with headlights...

1down vote Basically your headlamps are controlled by a computer. The Front Electronic Module (FEM) to be exact. The FEM grounds the headlamps when it wants to turn them on. This system was an early Multiplex design that reduced wire and total circuits where the modules communicate on a single serial line, now referred to as the CAN Bus (Controller Area Network). You will likely need a scan tool to diagnosis the car, and not a cheap one, but a professional model. You many even need a factory scan tool, though I doubt if for a Ford. Outside of security theft deterrent systems they allow the aftermarket professional scan tools to access their systems.
So where do you go from here? With or without a scan tool, the grounds are a good place to start.
G303 are the main ground for the FEM.
G304 is connected via C179 (C means connector) and through S139 (S means splice)
G304 is located behind the LH cowl panel C179 is located behind the LH side of the instrument panel S139 Dash panel to headlamp junction, near T/O to C192 Front Electronic Module (FEM)
You can see the FEM, G304, and C179 in the picture below. Outside of checking the connections and wiring there is not much you can do without a scan tool.

Hi!!
Your multifunction switch may be defective. Replace it. $39.99 at AutoZone

• Combination switches operate wipers, directionals, horn, headlights and dimmers.
• When not replaced, wipers, directionals, horn, headlights and dimmer, independently or as a group, will not function or turn off potentially causing safety issues.

Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa!!

hello,good day,hoping your fuse is in order,may check your fuse in engine room,if ok,better to send your car to your dealer,because signal light and wiper system is connected to a control module,to avoid parts replacement not deffective,ty

Fuses are listed here

* = maxi fuse

1*=50A I/P fuse panel
2*=40A blower motor relay
3*= 50A 4 wheel ABS module
4*=20a Main light switch-Instrument cluster
5*=50A Ignition switch, starter relay

6*=20A Transfer case relay
7*= NOT USED
8*=20A Auto Ride Control Switch/on off switch
9*=40A Auto Ride Control relay
10*=30A PCM power relay

mini fuses
1=10A A/C relay
2=20A Aux power point
3= not used
4=15A Fog lamps-Daytime lamps
5=10A Air Bag diagnostic monitor
6=10A Powertrain Control Module (PCM)
7=30A 4WABS module
8=30A PCM relay
9=20A Fuel Pump relay and RAP module
10= 15A Horn relay
11=15A Park Lamp relay-Main Light Switch
12=30A Main light switch--Multi Function switch
13=15A Heated O2 sensors, EGR Vacuum Regulator, EVR solenoid,Camshaft position (CMP) Sensor,
Cannister Vent Solenoid, A4LD Auto Transmission
14=30A Generator-Voltage regulator


Interior fuse panel (mini fuses)

1=7.5A Power mirror switch
2=7.5A Blower motor relay,PAD module,Air Bag diagnostic monitor
3=7.5A Trailer tow connector
4=10A Left headlamp
5=10A Data link connector (DLC)
6=7.5A Air bag diagnostic monitor, Blower motor relay, Passive deactivation Module (PAD)
7=7.5A Trailer Tow connector
8=10A Right headlamp, Daytime running lamps (DRL) module, Foglight relay
9=7.5A Stop Lamp switch
10= 7.5A Speed control-amplifier assembly,Brake pressure switch, Generic electronoc Module (GEM)
Shift lock actuator, Blend door actuator, Main light switch, RABS resistor, A/C heater assembly
Flasher
11= 7.5A Instrument cluster, Main light switch, RABS resistor
12= 10A Power window relay, Washer pump relay
13= 20A Stop lamp switch, Brake pressure switch
14= 20A Rear Anti Lock Brake system (RABS) module
**10A 4WABS module**

15=7.5A Instrument cluster
16= 30A Windshield wiper Motor, Wiper Hi-lo relay, wiper run/park relay
17=7.5A Cig lighter
18=15A Drivers unlock relay-All unlock relay
19=25A PCM power diode
20=7.5A RAP module GEM module, Radio
21=15A Flasher (hazard)
22=20A Aux power socket
23=15A Turn signals
24===not used
25= 7.5A GEM module, Instrument cluster
26= 10A Battery saver relay, Electronic Shift relay, Interior lamp relay
Power window relay,Electronic shift control module, transmission control
27=15A Switch,DRL, Backup lamp switch, DTR sensor,Instrument illumination dimming control module
Dome/map lamp, GEM,electronic shift,Interior lights,Glove box lamp and switch
28=7.5A GEM module-Radio
29= 15A Radio
30=15A Park lamps, trailer Tow relay
31===not used
32=10A rear blower
33=15A Headlamps, DRL module, Instrument cluster
34=7.5A Rear integrated control panel, CD
35=10A RABS test connector
36=7.5A CD, rear integrated control panel, memory seat, Message center Attached images __________________

I believe that this is what you are looking for.....
Fuse and relay locations--2nd generation power distribution box Layout- I think this is a good sticky candidate--



Fuses are listed here

* = maxi fuse

1*=50A I/P fuse panel
2*=40A blower motor relay
3*= 50A 4 wheel ABS module
4*=20a Main light switch-Instrument cluster
5*=50A Ignition switch, starter relay

6*=20A Transfer case relay
7*= NOT USED
8*=20A Auto Ride Control Switch/on off switch
9*=40A Auto Ride Control relay
10*=30A PCM power relay

mini fuses
1=10A A/C relay
2=20A Aux power point
3= not used
4=15A Fog lamps-Daytime lamps
5=10A Air Bag diagnostic monitor
6=10A Powertrain Control Module (PCM)
7=30A 4WABS module
8=30A PCM relay
9=20A Fuel Pump relay and RAP module
10= 15A Horn relay
11=15A Park Lamp relay-Main Light Switch
12=30A Main light switch--Multi Function switch
13=15A Heated O2 sensors, EGR Vacuum Regulator, EVR solenoid,Camshaft position (CMP) Sensor,
Cannister Vent Solenoid, A4LD Auto Transmission
14=30A Generator-Voltage regulator


Interior fuse panel (mini fuses)

1=7.5A Power mirror switch
2=7.5A Blower motor relay,PAD module,Air Bag diagnostic monitor
3=7.5A Trailer tow connector
4=10A Left headlamp
5=10A Data link connector (DLC)
6=7.5A Air bag diagnostic monitor, Blower motor relay, Passive deactivation Module (PAD)
7=7.5A Trailer Tow connector
8=10A Right headlamp, Daytime running lamps (DRL) module, Foglight relay
9=7.5A Stop Lamp switch
10= 7.5A Speed control-amplifier assembly,Brake pressure switch, Generic electronoc Module (GEM)
Shift lock actuator, Blend door actuator, Main light switch, RABS resistor, A/C heater assembly
Flasher
11= 7.5A Instrument cluster, Main light switch, RABS resistor
12= 10A Power window relay, Washer pump relay
13= 20A Stop lamp switch, Brake pressure switch
14= 20A Rear Anti Lock Brake system (RABS) module
**10A 4WABS module**

15=7.5A Instrument cluster
16= 30A Windshield wiper Motor, Wiper Hi-lo relay, wiper run/park relay
17=7.5A Cig lighter
18=15A Drivers unlock relay-All unlock relay
19=25A PCM power diode
20=7.5A RAP module GEM module, Radio
21=15A Flasher (hazard)
22=20A Aux power socket
23=15A Turn signals
24===not used
25= 7.5A GEM module, Instrument cluster
26= 10A Battery saver relay, Electronic Shift relay, Interior lamp relay
Power window relay,Electronic shift control module, transmission control
27=15A Switch,DRL, Backup lamp switch, DTR sensor,Instrument illumination dimming control module
Dome/map lamp, GEM,electronic shift,Interior lights,Glove box lamp and switch
28=7.5A GEM module-Radio
29= 15A Radio
30=15A Park lamps, trailer Tow relay
31===not used
32=10A rear blower
33=15A Headlamps, DRL module, Instrument cluster
34=7.5A Rear integrated control panel, CD
35=10A RABS test connector
36=7.5A CD, rear integrated control panel, memory seat, Message center Attached images __________________

I am not sure if this right and there should be diagram on the back of cover.


1 5A Power Mirror Switch

2 10A Daytime Running Lights (DRL),
Back-up Lamps, Transmission,
Passenger Air Bag Deactivation
Switch, Blower Motor Relay

3 7.5A Right Stop/Turn Trailer Tow
Connector

4 — Not Used

5 15A 4x4 Control Module

6 — Not Used

7 7.5A Left Stop/Turn Trailer Tow
Connector

8 — Not Used

9 7.5A Brake Pedal Position Switch

10 7.5A Speed Control Servo/Amplifier
Assembly, Generic Electronic
Module (GEM), Shift Lock
Actuator, Turn Signals

11 7.5A Instrument Cluster, 4x4, Main
Light Switch, Truck Central
Security Module (TCSM)

12 — Not Used

13 20A Brake Pedal Position Switch

14 10A or Not Used 10A: If equipped with Anti-Lock
Brake System (ABS) Control
Module

15 — Not Used

16 30A Windshield Wiper Motor, Wiper
Hi-Lo Relay, Wiper Run/Park
Relay

17 20A Cigar Lighter, Data Link
Connector (DLC)

18 — Not Used

19 25A PCM Power Diode, Ignition, PATS

20 7.5A Generic Electronic Module
(GEM), Radio

21 15A Flasher (Hazard)

22 20A Auxiliary Power Socket

23 — Not Used

24 7.5A Clutch Pedal Position (CPP)
switch, Starter Interrupt Relay

25 — Not Used

26 10A Battery Saver Relay, Auxillary
Relay Box, Restraint Central
Module (RCM), Generic Electroic
Module (GEM), Instrument
Cluster

27 — Not Used

28 7.5A Generic Electronic Module
(GEM), Radio

29 20A Radio

30 — Not Used

31 — Not Used

32 — Not Used

33 15A Headlamps, Daytime Running
Lamps (DRL) Module, Instrument
Cluster

34 — Not Used

35 15A or Not Used 15A: Horn Relay if Not Equipped
with Truck Central Security
Module

36 — Not Used

your owner manual sould have fuse chart. Some fuses/ekays in enine compartment. Some in car on left side of instrument panel

in car


Fuse Amps Circuits Protected 1 10 Power Mirrors, Anti-Theft Warning Light, Diagnostic Connector 2 5 Generic Electronic Module, Start Interrupt Relay Coil 3 5 Radio Illumination, Remote Radio Illumination, Electronic Instrument Cluster, Electronic Instrument Cluster PRNDL Illumination, Electronic Instrument Cluster Switch Module, Analog Cluster Illumination, Instrument Illumination 4 — Not Used 5 — Not Used 6 15 Rear Quarter Windows (LH and RH) 7 15 High Mounted Stoplamp, Brake Shift Interlock 8 25 Subwoofer, JBL Amplifier 9 10 Park and Turn Lamps, Side Marker Lamps, License Lamps, Stop Lamps 10 2 High Beam Indicator Electronic Cluster 11 15 Park Lamps 12 10 Remote Radio, Auxiliary Warning Lamp Module, Remote Keyless Entry (RKE) Module, Anti-Theft Controller Module, Radio Illumination 13 15 Radio, CD Disc Changer 14 5 Electronic Chromatic Mirror, Analog Cluster Indicator Lamps, Air Bag Module 15 — Not Used 16 15 Horns, Horn Relay Coil 17 15 Fog Lamps 18 25 Front Wiper Motor, Front Washer Pump, Wiper/Washer Relays 19 10 Generic Electronic Module (Pin 57), Electronic Instrument Cluster 20 25 Integrated Relay Control Module, Ignition Coil 21 10 Air Bag Module, Rear Window Defrost Relay, A/C Clutch, Temp Blend Door Actuator, Brake Shift Interlock 22 20 Rear Cigar Lighter, Power Plug 23 15 Multi-Function Switch 24 20 Rear Wiper Motor, Rear Washer Pump 25 10 Turn Signal Lamps, Instrument Cluster Turn Indicator 26 15 LH Aero Headlamp, Left and Right Trailer Stop/Turn/Hazard 27 15 Hazard Warning Lamps, Instrument Cluster Turn Indicator 28 15 Instrument Panel Cigar Lighter 29 15 Battery Saver Relay, Interior Lamp Control Relay, Interior Lamps, RH and LH Keyhole Lamps 30 25 Backup Lamps, Electronic Cluster 31 10 Rear Air Suspension 32 15 RH Aero Headlamp, Trailer Park Lamps 33 15 Anti-Lock Brake (ABS) Relay, Anti-Lock Brake (ABS) Module, Daytime Running Lamp (DRL) Module 34 30 One Touch Relay, LH Window Motor 35 15 Anti-Theft Controller Module 36 30 A/C Mode Switch 37 20 Door Lock Actuators, Memory Door Lock Relay 38 15 Heated Mirrors (LH and RH) 39 30 Auxiliary Blower Motor, Ref. Valve Solenoid 40 30 Window Motor (RH) 41 5 Autolamp Relay Coils, Autolamp Sensor 42 — — 43 — — 44 — —