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NHTSA ID Number: 10081241
Manufacturer Communication Number: PIT5509
Summary
THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ON HOW TO DIAGNOSE AND REPAIR VEHICLE THAT MAY HAVE A “CHECK TRAILER WIRING” OR “SERVICE TRAILER BRAKE SYSTEM” MESSAGE ON THE DRIVER INFORMATION CENTER WHEN A TRAILER IS CONNECTED TO THE VEHICLE. DIAGNOSTIC TROUBLE CODE C1114 SET IN THE CHASSIS CONTROL MODULE. CHASSIS CONTROL MODULE HAS TO DETERMINE THE TYPE OF TRAILER BRAKE SYSTEM THAT IS BEING USED. THE CHASSIS CONTROL MODULE CAN BE SENSITIVE TO A VARIETY OF TRAILER WIRING ISSUES. THE TECHNICIAN WILL NEED TO MAKE A TRAILER TESTER USING ELECTRIC TRAILER BRAKE MAGNETS AND 7-WAY TRAILER CONNECTOR TO DETERMINE IF IT IS A VEHICLE OR TRAILER ISSUE. IF THE CONCERN IS NOT DUPLICATED WITH THE TESTER INSTALLED, THE VEHICLE IS OPERATING CORRECTLY AND THE FOCUS SHOULD BE ON THE TRAILER WIRING OR 7 WAY CONNECTOR.
13 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| CHEVROLET | SILVERADO 1500 | 2014-2016 |
| CHEVROLET | SUBURBAN | 2014-2016 |
| CHEVROLET | TAHOE | 2015-2016 |
| GMC | SIERRA 1500 | 2014-2016 |
| GMC | YUKON | 2015-2016 |
Condition/Concern
Some customers may comment that when they have a trailer connected to the vehicle, they get a “Check Trailer Wiring” or “Service Trailer Brake System” message on the DIC. OTC C1114 could be set in the Chassis Control Module (CCM).
Diagnosing these concerns can be difficult because the issue could either be related to the truck or the trailer. This Pl is to provide some additional diagnostic information for these three symptoms:
- Check Trailer Wiring message
- Check Trailer Wiring message with OTC C1114
- Service Trailer Brake System message with OTC C1114
1 Associated Document
Service Bulletin Document
Bulletin No.: PIT5509
Date: Jun-2016
SB-10081241-2280.pdf 1001.61KB
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- VERSATILE: The Brakeman IV digital brake controller is compatible with a wide range of vehicles including Ford
, GM, Chevy, Dodge, RAM, Toyota, Jeep, and more with 2, 4, 6, and 8 brakes (1-4 axles). Vehicle-specific Tekonsha Plug & Play brake controller wiring harness sold separately. - TIME-DELAYED DIGITAL BRAKE CONTROLLER: Applies braking power that ramps up, or increases over a period of time, at a fixed rate. This makes the REESE Brakeman IV brake controller ideal for basic towing needs.
- EASILY INSTALL: The Brakeman IV trailer brake controller has a Plug & Play connection for easy installation. As a time-based controller with a compact design, the unit can be installed above or below the dash, in any direction, as it is within reach of the driver.
- EASY-TO-READ INDICATOR: This controller has an LED light display those changes from green to red to indicate trailer connectivity and power output.
- MANUAL BRAKING AVAILABLE: If you ever need to manually apply the brakes, simply move the manual control lever to the left. The Brakeman IV will apply power to your trailer’s brakes up to the amount of power previously set.
- COMPATIBILITY: The BRAKE-EVN electric brake controller is compatible with a wide range of vehicles including Ford, GM, Chevy, Dodge, RAM, Toyota, Jeep, and more with 2, 4, 6, and 8 brakes (1-4 axles). VEHICLE-SPECIFIC TEKONSHA PLUG & PLAY BRAKE CONTROLLER WIRING HARNESS SOLD SEPARATELY.
- PROPORTIONAL ELECTRIC BRAKE CONTROLLER: Provides automatic braking based on the intensity and rate at which you apply your tow vehicle’s brakes, thanks to an internal inertia sensor. This makes the Tekonsha BRAKE-EVN brake controller ideal in any braking situation.
- EASILY INSTALL THANKS TO PLUG & PLAY: The BRAKE-EVN trailer brake controller has a Plug & Play port for two plug adapters and a removeable electrical connector so the unit can be easily unplugged.
- EASY-TO-READ LED DISPLAY: Digital LED display shows settings, real-time diagnostics, and alerts.
- MANUAL BRAKING AVAILABLE: If you ever need to manually apply the brakes, simply move the manual control lever to the left. The BRAKE-EVN will apply power to your trailer’s brakes up to the amount of power previously set.
- PORTABLE — The Echo trailer brake controller has a non-invasive install and is easily transferrable from one vehicle to another. It plugs into any 7-way connector, wirelessly links to your smartphone using Bluetooth
- SMARTPHONE-READY — The Echo brake controller wirelessly syncs with your Apple or Android phone, turning it into a brake controller interface with the Smart Control app (Warning: Avoid distracted driving. Only make adjustments when vehicle is stationary)
- ZERO-TOOL INSTALL — Installing this trailer brake controller is as easy as plugging in a 7-way trailer wiring connector. It requires no tools, no extra wires and no hardware. A locking tab and strap keep it firmly connected. NOTE: Strap stored inside cap
- HIGHLY RESPONSIVE — Echo uses a triple-axis accelerometer to provide smooth, safe braking. It maintains responsive braking, even when your phone screen is locked, receives incoming calls or if the Bluetooth connection is lost
- VERSATILE — This electronic trailer brake controller easily transfers between vehicles and trailers and works on virtually any trailer with 1 to 2 axles (2 to 4 brakes). It is also fully compatible with cruise control, anti-lock brakes, low-voltage systems
- FACTORY LOOK. The Spectrum trailer brake controller is designed to mount onto the dash of your vehicle and integrate with the other controls like a factory brake controller; It allows you to control and monitor all brake settings using a simple knob. Compatible with low-volt, PWM, ABS, cruise control and electric over hydraulic
- HIDDEN MAIN MODULE; To maintain powerful trailer brake operation without obstructing your vehicle dash, the computer module of this brake controller is separate from the control knob and can be mounted out of sight
- INTELLIGENT BRAKING; This trailer brake controller operates with an integrated circuit called a triple-axis accelerometer; This circuit detects motion on three planes and provides braking power accordingly, up or down a hill
- EASY ADJUSTMENT; The Spectrum electric brake controller is highly adjustable to accommodate different vehicles, trailers and loads; The push-button knob offers easily accessible manual override whenever needed
- PROFESSIONAL TRAILER BRAKE CONTROLLER: Ensure safe towing with the Briidea professional trailer brake controller. Designed for reliability, it gives you peace of mind by ensuring smooth braking, significantly reducing the risk of accidents and vehicle damage
- TIME-DELAY TRAILER BRAKE CONTROLLER: The time delay brake controller can activate the trailer brake by applying varying power within a set period of time. Once engaged, the LED display conveniently shows the gain setting, ensuring your safety while driving
- SAFETY PROTECTION: Our trailer brake controllers has advanced overcurrent protection, short circuit protection and fault detection for your road safety. With LED display, real-time display of your current Settings, output voltage and fault diagnosis, so that you can solve problems in a timely manner
- EASY TO INSTALL: Includes a versatile mounting bracket and accessories for installation in any position or angle. For optimal placement, we recommend mounting it under the dashboard to ensure it doesn't obstruct your view while driving. This allows you to conveniently operate and monitor trailer brake activity from the cab
- COMPATIBILITY: The trailer brake controller kit is compatible with any vehicle now your driving, designed to operate 1 to 4 braked axles (2- 8 brakes), ideal for light duty towing and Occasional towing, etc
- Smart Braking for Everyday Towing – The Tow-Pro Liberty electric brake controller is designed for your daily towing needs, mirroring your vehicle’s braking force for smooth, safe stops. With intuitive control at your fingertips, enjoy effortless braking every time!
- Proportional Braking Made Easy – In Everyday Mode, this brake controller matches your vehicle’s braking force for smooth, balanced stops with no push or pull. Designed for 12-volt systems, it self-calibrates for effortless setup and works seamlessly with electric or electric-over-hydraulic brakes.
- Swaystop Control for Total Stability - Effortlessly stop trailer sway and restore stability with a simple button press. The Redarc trailer brake controller's advanced sway control keeps your trailer in line, ensuring the safety of your passengers, vehicle, and precious cargo—delivering peace of mind on every trip.
- Sleek Factory Look, No More Knee Knocking – The Tow-Pro Liberty trailer breakaway switch installs effortlessly into your dashboard, blending seamlessly with your vehicle’s interior for a premium factory finish. Enjoy a clutter-free, comfortable drive with no interference to your leg space or airbags, while maintaining effortless control at your fingertips.
- Built for Adventure - With over 45 years of manufacturing experience in Australia, designs rugged electronics and truck accessories for the toughest conditions. Their power management, solar, and brake control solutions are trusted by adventurers and industries alike, offering unmatched durability and customer support
- Time-based braking
- Mounts at any angle
- Percentage of braking power shown
- Plug-In Simple! with vehicle specific wiring kit
- Intuitive vertical manual slide
- PROPORTIONAL ELECTRIC BRAKE CONTROLLER: Provides automatic braking based on the intensity and rate at which you apply your tow vehicle’s brakes, thanks to an internal inertia sensor. This makes the Tekonsha P2 brake controller ideal in any braking situation.
- EASILY INSTALL AND STOW, THANKS TO PLUG & PLAY: The Primus IQ trailer brake controller has a snap-in dash mounting clip, Plug & Play port for two plug adapters, and removeable electrical connector so the unit can be easily unplugged, unclipped, and stored.
- EASY-TO-READ LED DISPLAY: Color LED display shows settings, real-time diagnostics, and alerts.
- BOOST FEATURE PROVIDES EXTRA BRAKING POWER: Boost provides up to three levels of additional stopping power at the touch of a button, giving you confidence in stopping safely when you’re hauling heavier loads and/or need more power to stop.
- VEHICLE APPLICATION: The Prodigy P2 electric brake controller is compatible with a wide range of vehicles including Ford, GM, Chevy, Dodge, RAM, Toyota, Jeep, and more with 2, 4, 6, and 8 brakes (1-4 axles). Vehicle-specific Tekonsha Plug & Play brake controller wiring harness sold separately.
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Subject: Models: Service Bullet,in PRELIMINARY INFORMATI01N Diagnostic Tip – Integrated Trailer Brake Control System 2014 Chevrolet Silverado 1500 2015-2016 Chevrolet Silverado, Suburban, Tahoe 2014 GMC Sierra 1500 2015-2016 GMC Sierra and Yukon Models With Integrated Trailer Brake Control (ITBC) system RPO JL 1 The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this Pl. Condition/Concern Bulletin No.: PIT5509 Date: Jun-2016 Some customers may comment that when they have a trailer connected to the vehicle, they get a “Check Trailer Wiring” or “Service Trailer Brake System” message on the DIC. OTC C1114 could be set in the Chassis Control Module (CCM). Diagnosing these concerns can be difficult because the issue could either be related to the truck or the trailer. This Pl is to provide some additional diagnostic information for these three symptoms: Check Trailer Wiring message Check Trailer Wiring message with OTC C1114 Service Trailer Brake System message with OTC C1114 Recommendation/Instructions General Information The trailer brake control system on the new body style trucks is compatible with two types of trailer brake systems: electromagnetic or electro-over hydraulic trailer brakes. The Chassis Control Module K38 (CCM) must determine which type of brakes the trailer is equipped with so the system can output correctly for the trailer’s brake system. Because the CCM has to determine the type of trailer brake system that is being used, it can be sensitive to a variety of trailer wiring issues. The Trailer Brake Power Control Module K133 continuously sends a test pulse out on the trailer control circuit 47, looking for a trailer that has been connected, and also to monitor for circuit faults. The way the test pulse reacts when a trailer is connected is how the CCM determines which type of braking system the trailer is equipped with. Even after the system detects the trailer, it will continue to send this test pulse on circuit 47, which now is monitoring both the truck and trailer circuitry. Circuit 47 continues to be monitored for any faults so the driver can be notified of any issues that may occur within the truck or trailer, as well as, to determine when the trailer is disconnected from the truck. If the CCM detects an issue, it will either display a “Check Trailer Wiring” or “Service Trailer Brake System” message on the DIC. See DIC message/DIC below. Electro-over Hydraulic Trailer Brakes Electro-over hydraulic brake systems have some unique characteristics and here are a couple examples: The electro-over hydraulic brake pump motor needs a minimum duty cycle of approximately 20-30% to turn on the pump motor. If the user gain is set too low, or during light brake pedal apply the pump motor may not turn on. This is normal. Increasing the user gain or brake pedal pressure will help alleviate this concern. When applying the brake pedal at O mph (stopped) there will be no output from the truck’s trailer brake system to the electro-over hydraulic pump motor. This is normal. Testing The Truck’s Trailer Brake System In many cases, trailer brake issues are the result of trailer wiring concerns and they are not related to the actual vehicle’s wiring. Most trailers with these wiring issues do not have high standards in relation to wiring/connections/splices/routing practices (see examples in Step 3 below) when compared to similar automotive practices for wiring/connections/splices/routing. Because of this, the CCM can set faults, which can be hard to determine if they are related to the truck or trailer. The easiest and fastest way to test the truck is to make a tester using trailer brake magnets. This type of tester utilizes actual trailer brake magnets and will load the truck’s electrical system, just like a trailer would do without having to have the complete trailer. Shown below is an examples of such c tester. The trailer brake system will operate with 1 to 4 pairs of trailer brake magnets (1 pair of magnets = 1 axle). It is suggested to make a tester where the pairs of magnets can be added or removed to equal the same number of brakes as the customer’s trailer. Also, it is advised to make the harness long enough so it can be plugged into the truck’s 7 way connector and have the magnets placed into the bed of the truck. When the tester is connected to the truck, the DIC will display “Trailer Connected” and GDS2 will show “Electro-magnetic” brakes in the CCM data parameter “Trailer Brake Type”, refer to item 1 in “GDS2 Data” section below. If so, the vehicle can be driven to see if any fault messages or DTC’s set. If none occur with the tester installed, the truck is operating correctly and the focus should be on the trailer wiring or 7 way connector. Making the Tester Parts needed: 1. 7 way RV trailer connector (example: Pollak Heavy Duty 7-Way Part# 12-706) Qty: 1 2. Electric Trailer Brake Magnets (example: Dexter Axle Part# K71-104-00) Qty: 2, 4, 6, or 8 3. 12 gauge wire and terminals/connectors Qty: as needed Connect two 12 gauge wires to the 7-way RV trailer connector: one to the “Ground” terminal and a second to the “Brake Controller Output” terminal (circuit 47), shown below. Connect the other ends of the 12 gauge wires to the trailer brake magnets. All magnets must be connected in parallel so each magnet wire is connected to the Ground and Brake Controller Output wires from the 7 way connector. Note: Do NOT connect the magnets in series with each other. Outside 7 Way Trailer Connector lns1d 2 Example ol ;1 2 axle trailer with ele<‘.:tric trailer br;1’ke$ Black = Ground Bllue = Trai1ler Brake Power Magnet If, after using the tester shown above, the truck functions properly, you may follow the diagnostic tips listed below to help diagnose a trailer related issue. Trailer issues are NOT covered under warranty, but this information listed below can be used to help the customer/trailer supplier understand and correct any trailer related issues if they so choose. DIC Message/ DTC’s It is important to understand and determine what message is being displayed, as well as, if OTC C1114 is setting. This will help determine what type of fault to inspect for on the trailer. Below is the combinations of message(s)/DTC to determine the type of fault the customer is experiencing: Check Trailer Wiring message with no OTC. This symptom is caused after the system detects a trailer and an open and/or high resistance occurs in circuit 47/trailer brake output circuit, during the same ignition cycle. NOTE: It is normal for the DIC to display “Check Trailer Wiring” when the trailer is disconnected from the truck while the ignition is in the run position. Check Trailer Wiring message with OTC C1114 (NO Service Trailer Brake message). This symptom is caused by a short to ground on circuit 47. Service Trailer Brake System with OTC C1114. This symptom is caused by a short to power on circuit 47 or a poor trailer ground. GDS2 Data GDS2 (scan tool) can be used to view several different data parameters in the CCM for the trailer brake system. The Trailer Brake Type and Trailer Brake Control Output Circuit parameters listed below can be helpful to make sure the CCM is detecting the correct trailer brake system in addition to which type of fault it has detected. To view “Trailer Brake Type” build GDS2 as follows: CCM->Data Display-> parameter “Trailer Brake Type”: “Electro-magnetic”, “Electro-over hydraulic brakes”, or “Undefined” (this is displayed with no trailer connected). Example, shown below is a trailer equipped with electromagnetic trailer brakes. To view “Trailer Brake Control Output Circuit” 47 faults, build GDS2 as follows: CCM->Data Display-> parameter “Trailer Brake Control Output Circuit”: Okay, Short to Ground, Short to Power, or Unknown. Example, shown below is a trailer with a short to ground on the trailer brake circuit. 3 ~ GDS 1 ~ l 01e- .::J – – –.- :!lrion lOGl’
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