The 2012 Audi A7 Onboard Power Supply and Networking Audi of America, LLC Service Training Printed in U.S.A
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Self-Study Program 990403 The 2012 Audi A7 Onboard Power Supply and Networking Audi of America, LLC Service Training Printed in U.S.A. Printed 1/2011 Course Number 990403 ©2011 Audi of America, LLC All rights reserved. Information contained in this manual is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of America, LLC., its affi liated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, nor may these materials be modifi ed or reposted to other sites without the prior expressed written permission of the publisher. All requests for permission to copy and redistribute information should be referred to Audi of America, LLC. Always check Technical Bulletins and the latest electronic service repair literature for information that may supersede any information included in this booklet. Table of Contents Introduction . 1 Power Supply . .2 Jump Start Terminals . 2 Battery . 3 Main Battery Cable . 3 Power Supply Overview . 4 Fuses and Relays . 5 Networking . .6 Control Module Locations . 6 Topology . 8 2012 A7 Bus Systems . 10 CAN Isolating Connector . 11 CAN Adaptor VAG 1598/38 . 11 FlexRay . 12 Control Modules . .15 Data Bus On Board Diagnostic Interface J533 . 15 Battery Monitoring Control Module J367 . 17 Alternator C . 18 Vehicle Electrical System Control Module J519 . 19 Exterior Lighting . .21 Light Switch E1 . 21 Headlights . 23 Side Marker Lights . 33 Tail Lights . 33 Service . .37 ESD Protection During Electronic Repairs . 37 Self-Study Programs for the 2012 Audi A7 . .38 Knowledge Assessment . .39 The Self-Study Program provides introductory information regarding the design Reference Note and function of new models, automotive components, or technologies. The Self-Study Program is not a Repair Manual! All values given are intended as a guideline only. ! For maintenance and repair work, always refer to current technical literature. i Notes ii Introduction Four-zone air conditioning, head-up display, To achieve this, the 2012 Audi A7 comes Bang & Olufsen Advanced Sound System, equipped with: navigation, WLAN hotspot, massage seats, LED headlights, Night Vision Assist, Audi pre – An aluminum main battery lead sense, Keyless Go, Audi drive select, Audi active – Energy recuperation for the alternator system lane assist, reversing camera — all of these – FlexRay bus system convenience features and safety functions would – LED headlights not be possible without the use of increasingly effi cient electronics. This Self-Study Program provides you with an To ensure the perfect operation of these in depth guide to the onboard power supply electronic components it is necessary to have system and networking functions of the 2012 A7. a stable and reliable onboard power supply, as well as high speed data bus networks. 481_050 1 Power Supply Jump Start Terminals The jump start terminals are located on the right hand side of the engine compartment. The positive terminal is connected to the main battery cable at the voltage distributor in the plenum chamber. The alternator and starter receive power via a cable connected to the jump start terminal. The ground terminal is located on the inner fender panel. Voltage distributor in plenum chamber Positive jump start terminal Main battery lead Electromechanical steering power supply cable 2 Battery The 2012 A7 battery is housed in the spare tire well. The main fuse carrier and Battery Interrupt Igniter N235 are connected to the battery positive terminal. Battery Monitoring Control Module J367 is located to the right of the battery and connected to the battery negative terminal. The A7 for the North American market will come equipped with a 110Ah/520A wet cell battery. Battery in Main Battery Cable spare tire well The main battery cable of the A7 is a fl exible aluminum ribbon cable. It is routed together with a round aluminum cable that supplies power for the electromechanical power steering system. They are routed through a rubber grommet in the spare tire well and then along the underbody along the left side of the vehicle. The two cables separate in the front left wheel well. The ribbon cable is routed through a rubber grommet into the plenum chamber. The round cable is directly routed from the wheel well to the electromechanical steering system in the engine compartment. 481_036 Through point from the spare tire well to the vehicle underbody Main battery cable through point from the wheel well into the plenum chamber 3 Power Supply Overview This is a schematic diagram. Refer to current technical literature for exact fuse assignments Coolant Fan Control and cable routing. Module J293 and Coolant Fan Control Module 2 J671 Alternator Power Steering Control Module J500 Starter Fuse and relay carrier SD Jump Start Fuse carrier SA Terminal Voltage distributor in plenum chamber Fuse carrier SB Fuse carrier SC Grounding point in spare tire well Fuse carrier SF Main fuse at battery positive terminal Battery Monitoring Control Module J367 481_018 Battery Interrupt Igniter N253 Battery 4 Fuses and Relays Voltage distributor in Fuse and relay carrier Fuse and relay carrier and Main fuse carrier plenum chamber on the right side of the CAN node connector in at battery positive instrument panel luggage compartment, terminal The coolant fan control right modules are supplied The fuses are labeled The battery interrupt power via fuses located SC in the current fl ow The fuses are labeled SF in igniter is also mounted at this point. The main diagram. They can the current fl ow diagram. on this fuse carrier. battery cable junction be accessed by the The fuses can be accessed point is here. customer after removing by the customer after the instrument panel removing the storage end cover. compartment in the luggage compartment at the rear left. 481_008 Fuse and relay carrier in Coupling station and Fuse and relay carrier Fuse and relay carrier the E-box in the plenum CAN node connector at in the Vehicle Electrical on the instrument chamber, driver side the bottom left A-pillar System Control Module panel, left area (under the windshield The fuses are labeled washer system reservoir) (below the instrument SB in the current The E-box lid also serves panel in the driver fl ow diagram. They as a support for the footwell) can be accessed engine control module. The fuses are labeled by the customer The fuses in the E-box are SD in the current fl ow after removing the labelled SA in the current diagram. instrument panel end fl ow diagram. cover. 5 Networking Control Module Locations Some of the control modules shown in this Refer to current technical literature for exact overview are optional and/or are country-specifi c installation locations of control modules, as well equipment. Boxes without numbers in the as for installation and removal instructions. illustration indicate locations for components not used in the North American market. The color of a box indicates which data bus it communicates on. JJ387387 JJ428428 RR161161 JJ851851 JJ521521 JJ844844 JJ794794 JJ500500 JJ217217 JJ234234 JJ849849 JJ255255 JJ852852 RR212212 JJ285285 JJ136136 JJ898898 GG8585 JJ623623 JJ527527 JJ104104 JJ853853 JJ519519 JJ850850 JJ745745 JJ386386 Key: Control Modules on the Convenience CAN bus Control Modules on the Display and Control CAN bus J136 Memory Seat/Steering Column Adjustment CM E265 Rear A/C Display Control Head J386 Driver Door Control Module J255 Climatronic Control Module J387 Front Passenger Door Control Module J285 Instrument Cluster Control Module J393 Comfort System Central Control Module J527 Steering Column Electronics Control Module J519 Vehicle Electrical System Control Module J772 Rear View Camera System Control Module J521 Front Passenger Memory Seat Control Module J791 Parallel Parking Assistance Control Module J605 Rear Lid Control Module J898 Windshield Projection Head-Up Display CM J872 Front Passenger Multicontour Seat CM J873 Driver Multicontour Seat Control Module Control Modules on the Powertrain CAN bus G85 Steering Angle Sensor J234 Airbag Control Module J540 Electromechanical Parking Brake Control Module J623 Engine Control Module J217 Transmission Control Module 6 JJ855855 JJ197197 JJ605605 JJ393393 JJ791791 JJ540540 JJ772772 JJ769769 JJ872872 JJ492492 EE265265 JJ533533 JJ873873 JJ770770 JJ525525 RRadioadio R JJ854854 481_009 Control Modules on the Extended CAN bus Control Modules on the FlexRay bus J745 Cornering Lamp and Headlamp Range CM J104 ABS Control Module J769 Lane Change Assistance Control Module J197 Level Control System Control Module J844 Automatic High Beam Assist Control Module J428 Distance Regulation Control Module J852 Camera Control Module J492 All Wheel Drive Control Module J853 Night Vision System Control Module J500 Power Steering Control Module J854 Left Front Seat Belt Tensioner Control Module J849 Sensor Electronics Control Module J855 Right Front Seat Belt Tensioner Control Module J850 Distance Regulation Control Module 2 J851 Image Processing Control Module Control Modules on the MOST bus J285 Instrument Cluster Control Module Sub-Bus Users J525 Digital Sound System Control Module R212 Infrared Camera J794 Information Electronics Control Module 1 J770 Lane Change Assistance Control Module 2 R Radio R161 DVD Changer Users of all Bus Systems (Gateway) J533 Data