Jaguar Stop/Start Issue
This bulletin applies to 2015 Jaguar F-Type, XE, XF and XJ vehicles. Customers may report while pressing the Auto Stop/Start button, a warning message may be displayed (Auto Stop/Start not available). DTC B12CD-87 will be logged in the gateway module (GWM). The ignition live input into the vehicle quality module (VQM) may have a poor connection, and/or there may be no LIN circuit between the VQM and GWM.
Check the ignition live circuit into VQM 6-way connector, pin 2. Repair as needed. On F-Type and XJ, check LIN circuit between VQM 6-way connector pin 4 and pin 13 of the GWM. Repair as needed. On XE and new XF models, check LIN circuit between VQM 6-way connector pin 4 and pin 58 of the BCM. Repair as needed. If these steps do not resolve the issue, replace the VQM.
About the Author
Information courtesy of Mitchell 1
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike Mavrigian
Motor Age Editor
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.