E-350. Where is speed control switch located?

Doesn't have a fuse just for CC . Main power supplys to the PCM - engine computer . The PCM supply's low voltage to CC switches (buttons) on steering wheel . CC is computer controlled . Your vehicle has electronic throttle control , dc electric motor on the throttle body controls speed , engine computer controls the DC motor . Any lights lit on the instrument cluster ? Air bag Or check engine .
Speed Control The speed control system consists of the following components:

• Speed control switches
• Speed control deactivator switch (part of the stoplamp switch)
• Stoplamp switch
• Clutch pedal speed control deactivator switch (manual transaxle)
• Speed control indicator
• Powertrain control module (PCM)
• Your best bet , have a qualified repair shop check it out .

In the SJB - smart junction box , Under the dash ! There are three fuse's - F2.27 10amp - F2.32 10amp - F2.17 15amp . Is your air bag light lit ?
SECTION 310-03: Speed Control 2004 Taurus/Sable Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 07/02/2003 Speed Control The vehicle speed control system consists of the following components:

• Brake pedal position (BPP) switch
• Speed control actuator cable
• Speed control switches
• Speed control deactivator switch
• Speed control indicator
• Speed control actuator
• Smart junction box (SJB)

NOTE: The clock spring provides the electrical interface between the steering column wiring and the speed control switches in the steering wheel.
The inputs to the speed control actuator are:

• Vehicle speed signal
• Speed control switches
• Brake pedal position (BPP) switch
• Deactivator switch

The outputs of the speed control actuator are:

• Speed control indicator lamp
• Speed control actuator cable controlling the throttle position

Sadly, the horn relay is built into the Smart Junction Block (passenger fuse box)
see diagram.
I think you may have a bad/sticking horn switch, which is part of the drivers airbag module. if there are no concerns with the speed control or airbag lamp on, the clock spring in the column is ok.

all the switch does is complete a ground circuit to the relay. you may have a wire pinched under the airbag in the wheel.



since an airbag is involved, I would recommend a dealer check this part. Airbags are dangerous.

Rick

If you have a manual system, you have a resistor. If electronic, you have a blower motor speed controller. Please rate if this helps.

here is info:

Control System Outputs-Manual A/C
Blower Motor Switch Resistor
The heater blower motor switch resistor has the following features:

• The assembly is located on the evaporator housing in the engine compartment.
• Three resistance elements are mounted on the resistor board to provide four blower motor speeds.
• Depending on the heater blower motor switch position, series resistance is added or bypassed in the blower motor circuit to decrease or increase blower motor speed.
• An overheating protective device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F) interrupting the blower motor operation in all speeds except HI.
• The thermal limiter cannot be reset and is not serviceable.

Control System Outputs-EATC
Blower Motor Speed Control
The blower speed control is located on the evaporator housing in the engine compartment.

• The function of the blower motor speed control is to convert low power signals from the electronic automatic temperature control module to a high current, variable ground feed for the blower motor (18527).
• The blower motor speed is infinitely variable and is controlled by the electronic automatic temperature control module software.
• A delay function provides a gradual increase or decrease in blower motor speed under all conditions.

Speed Control The speed control system consists of the following components:

• anti-lock brake control module
• brake pedal position (BPP) switch
• clutch pedal position (CPP) switch or jumper
• deactivator switch
• speed control actuator switches
• speed control servo
• speed control actuator cable
• speed control indicator
• brush assembly (Motorhome vehicles only)
• control and spring brush assembly (Motorhome vehicles only)
• Principles of Operation
  The speed control system is designed to maintain vehicle speed above 40 km/h (25 mph). After the ON switch is depressed, depressing the SET/ACCEL or COAST switch will activate the speed control servo. To increase a set speed, either depress and hold for continuous acceleration, or momentarily tap the SET/ACCEL switch for 1.6 km/h (1 mph) acceleration increments. To decrease a set speed, depress and hold the COAST switch until the target speed is reached, or momentarily tap the COAST switch for 1.6 km/h (1 mph) deceleration increments. When the speed control system has been disabled by tapping the brake pedal, the RESUME switch can be depressed and the vehicle will return to the original set speed if the vehicle is traveling over 40 km/h (25 mph) and the OFF switch has not been depressed.
  NOTE: The deactivator switch is provided as an additional safety feature. Normally, when the brake pedal is depressed, an electrical signal from the brake lamp circuit to the speed control servo will deactivate the system. Under increased brake pedal effort, the deactivator switch will open and remove power to the speed control servo, releasing the throttle independently of the speed control servo.
  NOTE: The air bag sliding contact provides the electrical interface between the steering column wiring and the speed control actuator switches in the steering wheel.
  The inputs to the speed control servo are:
  
  • vehicle speed signal
  • speed control actuator switches
  • brake pedal position (BPP) switch
  • clutch pedal position (CPP) switch (if equipped)
  • deactivator switch
  The outputs of the speed control servo are:
  
  • speed control indicator (Excursion and Super Duty)
  • speed control cable controlling the throttle position
  Inspection and Verification
  NOTE: If any concerns are noted with the speedometer or horn, address those concerns by referring to their associated sections before continuing speed control diagnosis.
  NOTE: When in speed control mode, initial depression of the clutch pedal may cause a normal momentary increase of engine rpm.
  NOTE: If the vehicle is a diesel, refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
  
  1. Verify the customer concern by operating the speed control system.
  1. Visually inspect for obvious signs of mechanical and electrical damage.
  
  
  Visual Inspection Chart Mechanical Electrical
  • Speed control cable
  • Speed control cable not attached to throttle
  • Central junction box (CJB) Fuse:
    • 6 (15A) (Excursion)
    • 8 (10A) (Motorhome)
    • 13 (20A) (Excursion, Super Duty)
    • 15 (5A) (Super Duty, Excursion)
    • 28 (10A) (Super Duty, Motorhome)
  • Speed control actuator switches
  • Brake pedal position (BPP) switch
  • Clutch pedal position (CPP) switch (if equipped)
  • Deactivator switch
  • Speed control servo
  • Wiring
  • Loose, corroded, or dirty connections
  • Bulb (Excursion and Super Duty)
  
  
  1. If the fault is not visually evident, go to the Self-Test Diagnostics - Excursion or Super Duty (Excursion, Super Duty), or verify the symptom and proceed to the Symptom Chart (Motorhome).
  2. Self-Test Diagnostics - Excursion, Super Duty
     WARNING: This test is a key on engine off (KOEO) test only that is conducted in park only with emergency brake fully engaged.
     
     1. Enter Self-Test Diagnostics by depressing the speed control OFF switch while turning the ignition key ON, making sure the engine does not start and is not running. The speed control indicator on the instrument panel will flash once to indicate that speed control module entered the diagnostic mode. FIVE ADDITIONAL FLASHES AT THIS POINT INDICATE A DEFECTIVE SPEED CONTROL SERVO. Release the OFF switch.
     1. Press the remaining switches in this sequence: ON, RESUME, COAST and SET/ACCEL.
        IF THE "ON" SWITCH IS NOT DEPRESSED WITHIN FIVE SECONDS AFTER ENTERING THE DIAGNOSTICS MODE, THE MODULE TIMES OUT AND THE PROCEDURE MUST BE STARTED OVER.
        The speed control indicator lamp will flash as each switch is depressed. Press each switch in the sequence immediately after the indicator light goes out for the previous switch.
     1. A lamp flash with the last button (SET/ACCEL) indicates that the STATIC test passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective.
        If the lamp does not flash with the last button, and additional flashes occur, follow the chart below for trouble codes:
     • 2 Flashes - BPP defective, circuit is defective, brake applied, CPP switch or jumper (if equipped).
     • 3 Flashes - Deactivator switch is open or circuit defective.
     • 4 Flashes - Vehicle speed signal is out of range or circuit is defective.
     1. Immediately after the STATIC test, the speed control servo does a DYNAMIC test by automatically actuating the throttle lever from 8 mm (0.315 in) to 12 mm (0.472 in) of travel from the idle position. During the DYNAMIC throttle pull, observe throttle movement to witness any binding or sticking of the speed control cable and correct connection of speed control cable to throttle lever. Make sure the THROTTLE RETURNS BACK TO IDLE POSITION.
     1. Return ignition switch to the OFF position and proceed to the Symptom Chart.

It is in the top of the differential

Check the switch, located on the brake pedel the stop light switch and the cruise control switch are on the brake pedel towards firewall. The cruise control switch is plastic.

This is very likely a bad blower motor resistor. When this resistor goes bad you have only off or high. I hope this helps.

Check this out also...the schematic is too small to see which fuse it is in the engine compartment Power Distribution Center (the fuse box). Is your cruise control not working?

Cruise Control The Cruise Command system is electrically actuated and vacuum operated. The turn signal lever on the steering column incorporates a slide switch which has three positions OFF, ON or RESUME. A SET button is located in the end of the lever. This device is designed to operate at speeds above approximately 35 mph (56 km/h).
The speed control module automatically controls throttle position to maintain a speed set by the operator. The vehicle will keep the set speed unless the driver presses the brake, clutch or accelerator pedal.


Exploded view of the cruise control switch and related components



vehicle speed sensor location

it's either the blower motor switch or blower motor resister. Resistor ?Heater Blower Motor Switch Removal Remove the battery (10655) ; refer to Section 414-01 . Remove the battery tray. Remove the screws. Remove the battery tray. Disconnect the heater blower motor switch resistor connector. Remove the heater blower motor switch resistor (18591). Remove the two screws. Remove the heater blower motor switch resistor. ----------------------------------- Switches Removal Disconnect the battery ground cable. Remove the center trim panel; refer to Section 501-12 . Remove the control assembly. Remove the screws. Remove the control assembly. Remove the A/C-heater function selector switch knob. Disconnect the vacuum harness connector. Disconnect the A/C-heater function selector switch connector. Remove the A/C-heater function selector switch. Remove the screw. Remove the A/C-heater function selector switch. Remove the temperature control switch knob. Disconnect the temperature control switch connector. Remove the temperature control switch. Remove the screw. Remove the temperature control switch. Remove the heater blower motor switch knob. Disconnect the heater blower motor switch connector. Remove the heater blower motor switch (18578). Remove the screw. Remove the heater blower motor switch. ----------------------------