Question about GMC R2500

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Hooked new brake controler to factory junction box,but controler does not light up,or work,help.

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Return the part. Some stores will refuse to accept the part but talking to the manager and explaining that the part you removed was failing and when you installed the "new" one, it did not work at all and don't back done. Request a new part.

Posted on Jul 25, 2009

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  • GMC Master
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Brake controller , as in Towing ? Is it hydraulic over electric? need to know.

Posted on Jul 24, 2009

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Posted on Jan 02, 2017

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1 Answer

What fuse is for RR brake and turn signals! On 2008 fordexplorer


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May 07, 2016 | 1996 Ford Taurus

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Cruise control stop working light dont show on dash can a fuse be out if so where is it located


There are three fuse's in the smart junction box , do you know where it is ? It's under the dash panel left side ! The fuse's are F2.27- 10amp , F2.32 - 10amp , F2.17 - 15 amp . They power the speed control servo ! Maybe the control switch's on the steering wheel don't work.
A little back ground on the system ! 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)
  • Principles of Operation
    The speed control system is designed to maintain vehicle a set speed above 48 km/h (30 mph). After the speed control ON switch is pressed, pressing the speed control switch SET/ACCEL will activate the speed control actuator. To increase a set speed, either press and hold for continuous acceleration, or momentarily tap the speed control switch SET/ACCEL for 1.6 km/h (1 mph) acceleration increments. To decrease a set speed, press and hold the speed control switch COAST until the target speed is reached, or momentarily tap the speed control switch COAST for 1.6 km/h (1 mph) deceleration increments. When the speed control system has been disabled by tapping the brake pedal, the speed control switch RESUME can be pressed and the vehicle will return to the original set speed if the vehicle is traveling over 48 km/h (30 mph) and the speed control switch OFF has not been pressed.
    NOTE: The deactivator switch is provided as an additional safety feature. Normally, when the brake pedal is pressed, an electrical signal from the brake lamp circuit to the speed control actuator will deactivate the system. Under increased brake pedal effort, the deactivator switch will open and remove power to the speed control actuator, releasing the throttle independently of the speed control actuator.
    NOTE: The clockspring 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
    • Inspection and Verification
      NOTE: If any concerns are noted with the speedometer, stoplamps, or horn, address those concerns by referring to the appropriate sections before continuing speed control diagnosis.
      1. Verify the customer concern by operating the speed control system.
      1. NOTE: Any aftermarket modifications, including but not limited to those listed below, may cause the speed control to not operate correctly:
        • Any wiring or lamp modifications affecting the brake lamp operation
        • LED brake lamps
        • Non-factory installed trailer wiring
        • Radios (speed sensitive, auto mute)
        • Remote starters and alarms
        • Lighting and electrical accessory modifications
        Visually inspect for obvious signs of mechanical or electrical damage:
        • Visually inspect the speed control actuator and accelerator controls.
        • Visually inspect the speed control cable without removing it and ensure smooth cable operation. Inspect the speed control cable connection to the throttle body.
        • Visually inspect the accelerator cable without removing it and ensure smooth cable operation. Inspect the accelerator cable connection to the throttle body. Also check for cable interference with the carpet, bulkhead grommet, insulation and instrument panel wiring.
      1. Visually inspect for obvious signs of mechanical and electrical damage.
      2. Visual Inspection Chart Mechanical Electrical
        • Speed control actuator cable
        • Throttle linkage
        • Battery junction box (BJB) fuse(s):
          • 4 (40A)
          • 12 (60A)
        • Smart junction box (SJB) fuses:
          • 14 (15A)
          • 57 (10A)
        • Wiring harness
        • Loose or corroded connections
        • Deactivator switch
        • Brake pedal position (BPP) switch
        • Speed control switches
        • Powertrain control module (PCM)
        • Speed control actuator
        • Bulb

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2 Answers

Why wont the cruise control work on a 2005 ford taurus but the cruise light comes on


The first thing to check is the tail lights. The cruise control will not work if any lights are out. Changing to LED tail lights also causes the cruise to not work.

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1 Answer

05 Ford Escape wont shift out of park. Brake light works and shift lock solenoid releases when 12v is applied to the coil at the connector. Red wire has 2v at all times and increases to 4v when key is...


You may need a shop manual for this.
There is a smart junction box that contains some mini-relays that controls the shift lock solenoid.
The junction box is controlled by the engine and body computers.
That red wire comes from the junction box.

Sep 25, 2013 | Ford Escape Cars & Trucks

2 Answers

I have a 2006 Chevy Silverado 1500 4wd, and both of my brake lights stopped working, but the light above the bed of the truck still works. I have checked all the fuses, changed the bulbs, and checked the...


well it sounds like you have a short fro junction block to taillights , make your own wire from where you know you have power to brake lights . and that will tell you where to go.

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1 Answer

I have a 2006 Chevy Silverado 1500 4wd, and both of my brake lights stopped working, but the light above the bed of the truck still works. I have checked all the fuses, changed the bulbs, and checked the...


I have seen this on cars. Wiring, and or connectors, and or sockets became defective from corrosion or whatever. Can be a frustrating job if not used to doing this type of work. There are many variables that can cause such problems.

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1 Answer

Have a 2008 f250 diesel I have no turn signal or brake lights on a trailer but running lights work ? The brake lights and signal lights work on truck . I don't have my owners manuel . What is the fuse...


CHECK THE FUSES IN THE BATTERY JUNCTION BOX # F34 25 AMP CARTRIDGE TYPE FUSE FOR TRAILER STOP/TURN RELAY
ALSO CHECK #33 IN THE SMARTJUNCTION BOX IF THE BRAKE CONTROLLER ISN'T WORKING

HOPE THIS HELPS

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1 Answer

2005 chevy 2500 brake lights wont work


Just to be sure you checked fuses underhood? There is a junction block at rear of truck on frame it can cause lights to not work check it to make sure all conections are tight.also check the trailer hook up for brake light power as this is on a seperate cicuit but is supplied by brake switch.If you have power there it will eliminate switch.your fuse box has a brake fuse and trailer brake fuse

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