{"id":12332,"date":"2019-11-27T12:26:09","date_gmt":"2019-11-27T17:26:09","guid":{"rendered":"https:\/\/techlink.mynetworkcontent.com\/?p=12332"},"modified":"2019-11-27T12:26:09","modified_gmt":"2019-11-27T17:26:09","slug":"unable-to-deactivate-brake-boost-system-in-gds-2","status":"publish","type":"post","link":"https:\/\/gm-techlink.com\/?p=12332","title":{"rendered":"Unable to Deactivate Brake Boost System in GDS 2"},"content":{"rendered":"<p>After the Brake Master Cylinder Assembly has been replaced on 2019-2020 XT4 models, a GDS 2 error message may display when trying to deactivate the brake boost system when performing the hydraulic bleed procedure.<\/p>\n<p>Being unable to deactivate the brake boost system may be caused by the B20 Brake Fluid Level Switch and the B34D Engine Coolant Temperature Sensor 4 Connector being swapped during reassembly. If these connectors are swapped, DTCs C0049 SYM05 (Low Brake Fluid Indicated) will be stored in the Electronic Brake Control Module (EBCM) and a P2AFF SYM (Engine Coolant Temperature Sensor 4 Circuit High Voltage) will be stored in the Engine Control Module (ECM).<\/p>\n<p>The Brake Fluid Level Switch Connector and the Engine Coolant Temperature Sensor 4 Connector are identical and can be easily swapped. The harness retainers and the wire colors are different.<\/p>\n<p>Shown are the correct connections of the Engine Coolant Temperature Sensor 4 (Fig. 10) and Brake Fluid Level Sensor. (Fig. 11)<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-12315\" src=\"https:\/\/techlink.mynetworkcontent.com\/wp-content\/uploads\/2019\/11\/F10-brake-2.jpg\" alt=\"\" width=\"740\" height=\"480\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/11\/F10-brake-2.jpg 740w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/11\/F10-brake-2-300x195.jpg 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/11\/F10-brake-2-85x55.jpg 85w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/11\/F10-brake-2-200x130.jpg 200w\" sizes=\"auto, (max-width: 740px) 100vw, 740px\" \/><strong>Fig. 10<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-12316\" src=\"https:\/\/techlink.mynetworkcontent.com\/wp-content\/uploads\/2019\/11\/F11-brake-1.jpg\" alt=\"\" width=\"740\" height=\"480\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/11\/F11-brake-1.jpg 740w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/11\/F11-brake-1-300x195.jpg 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/11\/F11-brake-1-85x55.jpg 85w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/11\/F11-brake-1-200x130.jpg 200w\" sizes=\"auto, (max-width: 740px) 100vw, 740px\" \/><strong>Fig. 11<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>If the GDS 2 error message is displayed (Fig. 12), verify that the connectors are in the correct location.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-12317\" src=\"https:\/\/techlink.mynetworkcontent.com\/wp-content\/uploads\/2019\/11\/F12-brake-3.jpg\" alt=\"\" width=\"740\" height=\"480\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/11\/F12-brake-3.jpg 740w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/11\/F12-brake-3-300x195.jpg 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/11\/F12-brake-3-85x55.jpg 85w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/11\/F12-brake-3-200x130.jpg 200w\" sizes=\"auto, (max-width: 740px) 100vw, 740px\" \/><strong>Fig. 12<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><em>&#8211; Thanks to Christopher Hightower<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>After the Brake Master Cylinder Assembly has been replaced on 2019-2020 XT4 models, a GDS 2 error message may display when trying to deactivate the brake boost system when performing [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-12332","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/12332","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12332"}],"version-history":[{"count":1,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/12332\/revisions"}],"predecessor-version":[{"id":12333,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/12332\/revisions\/12333"}],"wp:attachment":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}