[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-654969-105":59,"doc-detail-654969-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","bulletin-no-pit5509a-diagnostic-tip-check-andor-service-trailer-brake-system","Bulletin No. PIT5509A - Diagnostic Tip-Check and/or Service Trailer Brake System","","Diagnostic bulletin PIT5509A dated Jan-2017 addresses DTC C1114 related to the integrated trailer brake control (ITBC) system on 2014-2017 Chevrolet Silverado, Suburban, Tahoe and 2014-2017 GMC Sierra, Yukon with RPO JL1. It explains how the CCM determines trailer brake type via test pulses on circuit 47, why “Check Trailer Wiring” or “Service Trailer Brake System” may appear, and why issues can originate from either truck or trailer. It provides guidance for electro-over hydraulic characteristics and a practical magnet-based tester procedure to isolate faults and focus on trailer wiring or the 7-way connector.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/bulletin-no-pit5509a-diagnostic-tip-check-andor-service-trailer-brake-system/654969/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/bulletin-no-pit5509a-diagnostic-tip-check-andor-service-trailer-brake-system/654969.png","ImageObject",300,407,{"name":92,"@type":93},"Terk","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-25",true,{"@type":102,"interactionType":103,"userInteractionCount":34},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What triggers the DIC messages related to DTC C1114?","Question",{"text":112,"@type":113},"When a trailer is connected, the CCM may set DTC C1114 and display “Check Trailer Wiring” or “Service Trailer Brake System” on the DIC.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How does the CCM determine the type of trailer brake system?",{"text":117,"@type":113},"The Trailer Brake Power Control Module K133 sends a test pulse on trailer control circuit 47, and the CCM uses how the pulse responds when a trailer is connected to identify the brake type.",{"name":119,"@type":110,"acceptedAnswer":120},"How can technicians quickly test whether the truck trailer brake system is operating correctly?",{"text":121,"@type":113},"Build a tester using trailer brake magnets connected to a 7-way connector (ground and brake controller output/circuit 47), then confirm DIC and GDS2 results and drive to see whether fault messages or DTCs set.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},654969,1793052316,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":34,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":34,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144},1099525198933,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","Bulletin No.: PIT5509A  \nDate: Jan-2017  \nSubject: Diagnostic Tip-Check and/or Service Trailer Brake System message DTC C1114  \nModels: 2014 Chevrolet Silverado 1500  \n2015-2017 Chevrolet Silverado, Suburban, Tahoe  \n2014 GMC Sierra 1500  \n2015-2017 GMC Sierra and Yukon Models  \nWith Integrated Trailer Brake Control (ITBC) system RPO JL1  \nThis PI was superseded to add 2017 model years and update the title and recommendation. Please discard PIT5509.  \nThe following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.  \nCondition/Concern  \nSome 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. DTC C1114 could be set in the Chassis Control Module (CCM) .  \nDiagnosing these concerns can be difficult because the issue could either be related to the truck or the trailer. This PI is to provide some additional diagnostic information for these three symptoms:  \n– Check Trailer Wiring message  \n– Check Trailer Wiring message with DTC C1114  \n– Service Trailer Brake System message with DTC C1114  \nRecommendation/Instructions  \nGeneral Information  \nThe 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.  \nThe 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.  \nEven 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 th 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.  \nElectro-over Hydraulic Trailer Brakes  \nElectro-over hydraulic brake systems have some unique characteristics and here are a couple examples:  \n– 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.  \n– When applying the brake pedal at 0 mph (stopped) there will be no output from the truck's trailer brake system to the electro-over hydraulic pump motor. This is normal.  \nTesting The Truck's Trailer Brake System  \nIn 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","cbCaieA9x88ZywZt","https://ap.wps.com/l/cbCaieA9x88ZywZt","pdf",895706,"English","# Condition/Concern\n## Recommendation/Instructions\n### General Information\n### Electro-over Hydraulic Trailer Brakes\n### Testing The Truck's Trailer Brake System\n### Making the Tester","[{\"question\":\"What triggers the DIC messages related to DTC C1114?\",\"answer\":\"When a trailer is connected, the CCM may set DTC C1114 and display “Check Trailer Wiring” or “Service Trailer Brake System” on the DIC.\"},{\"question\":\"How does the CCM determine the type of trailer brake system?\",\"answer\":\"The Trailer Brake Power Control Module K133 sends a test pulse on trailer control circuit 47, and the CCM uses how the pulse responds when a trailer is connected to identify the brake type.\"},{\"question\":\"How can technicians quickly test whether the truck trailer brake system is operating correctly?\",\"answer\":\"Build a tester using trailer brake magnets connected to a 7-way connector (ground and brake controller output/circuit 47), then confirm DIC and GDS2 results and drive to see whether fault messages or DTCs set.\"}]","Bulletin No. PIT5509A - Diagnostic Tip-Check and/or Service Trailer Brake System | PDF",1792958783,18]