{"id":76266,"date":"2025-11-11T13:52:45","date_gmt":"2025-11-11T05:52:45","guid":{"rendered":"https:\/\/hongtronics.com\/?p=76266"},"modified":"2025-11-11T13:52:48","modified_gmt":"2025-11-11T05:52:48","slug":"kcan-bus-diagnosis-bmwx5","status":"publish","type":"post","link":"https:\/\/hongtronics.com\/en\/kcan-bus-diagnosis-bmwx5\/","title":{"rendered":"Pico Auto Diagnostic Cases] 2008 BMW X5 3.0Si K-CAN Bus Failure Diagnosis and Repair"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"76266\" class=\"elementor elementor-76266\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-8818a3a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8818a3a\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7e0aa16\" data-id=\"7e0aa16\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9640706 elementor-widget elementor-widget-image\" data-id=\"9640706\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"255\" src=\"https:\/\/hongtronics.com\/wp-content\/uploads\/2024\/06\/\u5b98\u7db2\u5716\u7247banner-\u6c7d\u8eca\u552e\u5f8c_\u5de5\u4f5c\u5340\u57df-1-1536x382-1-1024x255.jpg\" class=\"attachment-large size-large wp-image-40315\" alt=\"PicoAuto\u6c7d\u8eca\u793a\u6ce2\u5668\uff0c\u514d\u62c6\u8a3a\u65b7\u3001\u5feb\u901f\u4fee\u8eca\" srcset=\"https:\/\/hongtronics.com\/wp-content\/uploads\/2024\/06\/\u5b98\u7db2\u5716\u7247banner-\u6c7d\u8eca\u552e\u5f8c_\u5de5\u4f5c\u5340\u57df-1-1536x382-1-1024x255.jpg 1024w, https:\/\/hongtronics.com\/wp-content\/uploads\/2024\/06\/\u5b98\u7db2\u5716\u7247banner-\u6c7d\u8eca\u552e\u5f8c_\u5de5\u4f5c\u5340\u57df-1-1536x382-1-300x75.jpg 300w, https:\/\/hongtronics.com\/wp-content\/uploads\/2024\/06\/\u5b98\u7db2\u5716\u7247banner-\u6c7d\u8eca\u552e\u5f8c_\u5de5\u4f5c\u5340\u57df-1-1536x382-1-768x191.jpg 768w, https:\/\/hongtronics.com\/wp-content\/uploads\/2024\/06\/\u5b98\u7db2\u5716\u7247banner-\u6c7d\u8eca\u552e\u5f8c_\u5de5\u4f5c\u5340\u57df-1-1536x382-1-600x149.jpg 600w, https:\/\/hongtronics.com\/wp-content\/uploads\/2024\/06\/\u5b98\u7db2\u5716\u7247banner-\u6c7d\u8eca\u552e\u5f8c_\u5de5\u4f5c\u5340\u57df-1-1536x382-1.jpg 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cdb0682 elementor-widget elementor-widget-html\" data-id=\"cdb0682\" data-element_type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<!DOCTYPE html>\r\n<html lang=\"zh-Hant\">\r\n<head>\r\n    <meta charset=\"UTF-8\">\r\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\r\n    <title>\u5b8f\u8679\u514d\u62c6\u8a3a\u65b7 | 2008 \u5e74 BMW X5 3.0Si K-CAN \u532f\u6d41\u6392\u6545\u969c\u8a3a\u65b7\u8207\u4fee\u5fa9<\/title>\r\n    <link rel=\"stylesheet\" href=\"styles.css\">\r\n<\/head>\r\n<body>\r\n    <div class=\"product-content\">\r\n        <div class=\"product-header\">\r\n            <h1>Honghong Diagnostics | 2008 BMW X5 3.0Si K-CAN Bus Troubleshooting and Repair<\/h1>\r\n        <\/div>\r\n\r\n        <div class=\"product-section\">\r\n            <h2 class=\"custom-title\">Failure phenomenon<\/h2>\r\n            <p>A 2008 BMW X5 3.0Si with N52B30BF engine has accumulated mileage of approximately 190,000 kilometers. When the vehicle was inspected by Diagnostic Troubleshooter during factory maintenance, it was found that several control units, including the Suspension Height Control (EHC), Keyless Start Control (CAS), Park Distance Control (PDC), Center Touch Display (CID), and Reversing Camera Module (RFK), had stored the fault code of \"K-CAN Bus Fault\" as shown in Fig. 1 below, and could not be cleared. cannot be cleared.<strong style=\"color: #0E407E;\">Initially, the K-CAN bus of this vehicle may have an abnormality.<\/strong><\/p>\r\n            <p>\r\n            <img decoding=\"async\" src=\"https:\/\/hongtronics.com\/wp-content\/uploads\/2025\/11\/\u56fe1-\u5b58\u50a8\u7684\u6545\u969c\u4ee3\u7801.webp\">\r\n            <p class=\"img-source\">Fig. 1\uff5cK-CAN Error Codes Stored in the Control Unit<\/p>\r\n            \r\n        <\/div>\r\n\r\n        <div class=\"product-section\">\r\n            <h2 class=\"custom-title\">Fault Diagnostics<\/h2>\r\n            <p>The K-CAN bus signal waveform is measured from the EHC module side using an Acer Pico automotive oscilloscope (see Figure 2):\r\n               <p> <strong style=\"color: #0E407E;\">K-CAN H line<\/strong> The signal is transmitted normally when the low level is about 0.1 V and the high level is about 3.9 V.<p><strong style=\"color: #0E407E;\">K-CAN L line<\/strong>The signal amplitude is normal, but the signal is lost frequently.\r\n                \r\n       <p><strong style=\"color: #0E407E;\">Note: The vehicle's K-CAN bus has a communication rate of 100 kbit\/s, which is a low-speed CAN system that can maintain communication in a single-wire situation.<\/strong>\r\n         <p>Based on the results of waveform analysis, it can be determined that the waveform characteristics are consistent with<strong style=\"color: #0E407E;\">K-CAN L line open<\/strong>This means that even if one line is down, the other line can still maintain communication. That is, even if one line is interrupted, the other line can still maintain communication, so it can be initially recognized as a<strong style=\"color: #0E407E;\">K-CAN L line break fault<\/strong>\u3002\r\n            <p>\r\n            <img decoding=\"async\" src=\"https:\/\/hongtronics.com\/wp-content\/uploads\/2025\/11\/\u56fe2-\u6545\u969c\u65f6\u7684K-CAN\u603b\u7ebf\u4fe1\u53f7\u6ce2\u5f62.webp\">\r\n            <p class=\"img-source\">Fig. 2\uff5cWaveform of K-CAN bus signal during failure<\/p>\r\n            <p> Further inspection of the K-CAN bus circuit reveals that there is a total of<strong style=\"color: #0E407E;\">Four Docking Points<\/strong>\uff1a<br>1. X15001 and X15002 <br>2. X15003 and X15004 <br>3. X15005 and X15006 <br>4. X15011 and X15012.\r\n<p>Since oxidized or loosened contacts are a common problem, the technician prioritized checking the contacts X15005 and X15006 on the right side of the rear row, and found that there was a problem inside the wiring harness. <strong style=\"color: #0E407E;\">Water seepage marks<\/strong>(See Figure 3).\r\n            <img decoding=\"async\" src=\"https:\/\/hongtronics.com\/wp-content\/uploads\/2025\/11\/\u56fe3-\u7ebf\u675f\u6709\u6d78\u6c34\u75d5\u8ff9.webp\">\r\n            <p class=\"img-source\">Fig. 3\uff5cWater seepage marks inside wiring harnesses<\/p>\r\n            <p>After stripping the wiring harness, a contact was found. <strong style=\"color: #0E407E;\">X15006 Obvious oxidized corrosion<\/strong>(See Figure 4). The K-CAN L wire breaks when gently pulled and tested; it is assumed that the fault is caused by this contact. And the contact<strong style=\"color: #0E407E;\"> X15005 also slightly oxidized<\/strong>The K-CAN H line can communicate normally because it is not in contact with the K-CAN H line, but still maintains contact.\r\n            <img decoding=\"async\" src=\"https:\/\/hongtronics.com\/wp-content\/uploads\/2025\/11\/\u56fe4-\u63a5\u70b9X15006\u6c27\u5316\u4e25\u91cd.webp\">\r\n            <p class=\"img-source\">Fig. 4\uff5cContact X15006 oxidized heavily<\/p>\r\n        <\/div>\r\n\r\n        <div class=\"product-section\">\r\n            <h2 class=\"custom-title\">fault resolution<\/h2>\r\n            <p>\u6280\u5e2b\u91cd\u65b0\u4fee\u5fa9\u4e26\u710a\u63a5 X15005 \u8207 X15006 \u8655\u7684\u5c0e\u7dda\uff0c\u5b8c\u6210\u9632\u6c34\u8207\u7d55\u7de3\u8655\u7406\u5f8c\u518d\u6b21\u8a66\u8eca\u3002\r\n\u6545\u969c\u78bc\u300cK-CAN \u532f\u6d41\u6392\u6545\u969c\u300d\u5df2\u6210\u529f\u6e05\u9664\uff0c\u7cfb\u7d71\u6062\u5fa9\u6b63\u5e38\u901a\u8a0a\uff0c\u4ee3\u8868\u6545\u969c\u6392\u9664\u5b8c\u6210\u3002\r\n                \r\n                \r\n               \r\n\r\n        <div class=\"product-section\">\r\n            <h2 class=\"custom-title\">Fault Summary<\/h2>\r\n            <p>The K-CAN bus of this vehicle has a communication rate of 100 kbit\/s and belongs to the<strong style=\"color: #0E407E;\">Low-speed CAN system<\/strong>Therefore, even if a single line is disconnected, some communication functions can still be maintained.<\/p>\r\n            <p><strong style=\"color: #0E407E;\">However, when the amount of transmitted data on the bus increases, signal loss becomes more pronounced, resulting in some functional limitations.<\/strong>\r\nThis fault case sharing shows that using the<strong style=\"color: #0E407E;\">High Resolution Pico Automotive Oscilloscopes<\/strong>The CAN bus can be used to determine the type of CAN bus abnormality, and can still communicate even if the bus is disconnected on a single line, but the CAN bus can be used to communicate even if the bus is disconnected on a single line.<strong style=\"color: #0E407E;\">Be aware of potential delays and data loss.<\/strong>Water seepage in wiring harnesses and oxidized connectors are common causes of vehicle communication system failures and need to be addressed.<strong style=\"color: #0E407E;\">Special inspection of environmental sealing<\/strong>\u3002<\/p>\r\n        <\/div>\r\n\r\n        <footer class=\"product-footer\">\r\n            <div class=\"additional-info\">\r\n                <p class=\"interest-message\"><strong style=\"color: #0E407E;\">If you are interested, you are welcome to follow us for more information about the article, and if you have any questions.<a href=\"https:\/\/line.me\/R\/ti\/p\/@433rhnwm\">Feel free to contact us as well!<\/a><\/strong><\/p>\r\n                <div class=\"related-articles\">\r\n                    <h3>Extended Reading:<\/h3>\r\n                    <ul>\r\n                        <li><a href=\"https:\/\/hongtronics.com\/en\/picoscope-com-land-rover-freelander2-can-bus-fault-diagnosis\/\">\u27a2\u3010Pico Automotive Diagnostic Case\u3011Pico Oscilloscope Helps You Easily Solve Land Rover Freelander 2's Mid-Speed CAN Bus Failure<\/a><\/li>\r\n                        <li><a href=\"https:\/\/hongtronics.com\/en\/car-window-glass-lifting-problem\/\">\u27a2\u3010Pico Auto Diagnostic Case\u30112014 Maserati Ghibli Driver's Side Window Cannot Be Raised or Lowered<\/a><\/li>\r\n                    <\/ul>\r\n                <\/div>\r\n            <\/div>\r\n        <\/footer>\r\n    <\/div>\r\n<\/body>\r\n<\/html>\r\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4da4bc0 elementor-widget elementor-widget-image\" data-id=\"4da4bc0\" data-element_type=\"widget\" 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[&hellip;]<\/p>","protected":false},"author":46,"featured_media":76278,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","iawp_total_views":33,"ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[2295],"tags":[3396,378,4036,1570,376,3400],"table_tags":[],"class_list":["post-76266","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-2295","tag-pico-","tag-pico","tag-4036","tag-1570","tag-376","tag-3400","entry","has-media","owp-thumbs-layout-horizontal","owp-btn-normal","owp-tabs-layout-horizontal","has-no-thumbnails","has-product-nav"],"aioseo_notices":[],"jetpack_featured_media_url":"https:\/\/hongtronics.com\/wp-content\/uploads\/2025\/11\/2008-BMW-X5-3.0si.webp","_links":{"self":[{"href":"https:\/\/hongtronics.com\/en\/wp-json\/wp\/v2\/posts\/76266","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hongtronics.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hongtronics.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hongtronics.com\/en\/wp-json\/wp\/v2\/users\/46"}],"replies":[{"embeddable":true,"href":"https:\/\/hongtronics.com\/en\/wp-json\/wp\/v2\/comments?post=76266"}],"version-history":[{"count":7,"href":"https:\/\/hongtronics.com\/en\/wp-json\/wp\/v2\/posts\/76266\/revisions"}],"predecessor-version":[{"id":76277,"href":"https:\/\/hongtronics.com\/en\/wp-json\/wp\/v2\/posts\/76266\/revisions\/76277"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hongtronics.com\/en\/wp-json\/wp\/v2\/media\/76278"}],"wp:attachment":[{"href":"https:\/\/hongtronics.com\/en\/wp-json\/wp\/v2\/media?parent=76266"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hongtronics.com\/en\/wp-json\/wp\/v2\/categories?post=76266"},{"taxonomy":"post_tag","emb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