Table of Contents E70 Outside Mirrors Subject Page Introduction .4 E70 Outside M irrorVariants.4 Functions .11 M irror Adjustment .11 Outside M irror Adjustment (Standard).11 Outside M irror Adjustment (Photochromatic).11 Detecting Position of Outside Mirrors.11 M irror Heating .12 Low Voltage .12 Terminal 50.12 Auxiliary Heater .13 M irror Fold-in .13 Photochromatic Outside Mirrors .13 Outside Mirror with Memory Function .13 Remote Control .13 Storing M emory Position .14 Calling Up Memory Position .14 Automatic Parking Function .14 Folding Mirror Manually .14 Components.15 Driver's Door Switch Cluster.15 Drive Unit.16 Drive Unit without Memory .16 Drive Unit with Memory .16 Footwell Module .16 J unction Box Control Unit.16 Roof Functions Center.16 Initial Print Date: 10/06 Revision Date: Subject Page Outside Mirrors Model: E70 Production: From Start of Production IBJICI1WIS After completion of this module you will be able to: • Describe the functions of the Outside M irrors on the E70. • Identify the components that make up the Outside M irrors on the E70. • Diagnose and service the Outside M irrors on the E70. 3 E70 Outside Mirrors Introduction E70 Outside Mirror Variants Two versions of the outside mirrors are available for the E70. Electrically adjustable and heated outside mirrors are standard equipment. Photochromatic Interior and exterior mirrors with automatic dimming function can be ordered as an optional extra. This option requires the interior rear-view mirror with auto¬ matic dimming function. The memory function forthe outside mirrors is also available as part of electrical seat adjustment with memory. The outside mirrors are connected via the LIN-bus and additionally feature the following functions: • Outside mirrorfold-in. • Photochromatic outside mirrors. • Electrical seat adjustment with memory (including outside mirror memory). 4 E70 Outside Mirrors Input/output - Outside Mirrors Index Explanation Index Explanation 1 Instrument cluster 5 Outside mirror, passenger's side 2 Footwell module FRM 6 M irror adjustment switch in driver's door switch clusterSBFA 3 Outside temperature sensor 7 Outside mirror, driver's side 4 J unction box control unitj B K-CAN Body CAN The instrument cluster (1) registers the outside temperature and makes it available to the junction box control unit (4), outside mirror Low (basis version). The junction box control unit powers the outside mirror heating system. The outside mir¬ rors (5 +6) can be adjusted with the mirror adjustment switch in the driver's door switch cluster (6). Note: In the High version of the outside mirrors, the footwell module (2) receives the outside temperature from the instrument cluster. The out¬ side mirrors are connected via the LIN-bus. The footwell therefore requests the mirror heating function via the LIN-bus. 5 E70 Outside Mirrors System Circuit Diagram - Standard Outside Mirrors 8 «J.S8g KJ. 20q • 6 E70 Outside Mirrors Legend forSystem Circuit Diagram - Standard Outside Mirrors Index Explanation Index Explanation B Outside temperature sensor 9 Outside mirror heating, driver's side 2 J unction box control unitj B 10 Outside mirror, driver's side 3 Outside mirror, passenger's side 11 Footwell module FRM B Outside mirror heating, passenger's side 12 Instrument cluster 5 Actuator motorfor passenger's side outside mirror K-CAN BodyCAN 6 Mirror selector switch in driver's door switch clusterSBFA KL30 Terminal 30 7 Mirror adjustment switch in driver's door switch clusterSBFA KL 58g Terminal 58g 8 Actuator motorfor driver's outside mirror The instrument cluster (12) receives value corresponding to the outside temperature from the outside temperature sensor (1) and makes it available to the junction box control unit (2). The junction box control unit activates the outside mirror heating (4 and 9). The mirror adjustment motors (5 and 8) are activated directly by the mirror adjustment switch (7). 7 E70 Outside Mirrors Photochromatic Outside System Circuit Diagram 8 E70 Outside Mirrors Legend for Photochromatic Outside System Circuit Diagram Index Explanation Index Explanation B Outside temperature sensor 11 Memory, outside mirror potentiometer, driver's side 2 Outside mirror, passenger's side 12 Motor for folding mirrorfunction, driver's side 3 Outside mirror heating, passenger's side 13 Outside mirror heating, driver's side B Motor for folding mirror function, passenger's side 14 Outside mirror, driver's side 5 Memory, outside mirror potentiometer, passenger's side 15 Footwell module FRM 6 Photochromatic outside mirror, passenger's side 16 Instrument cluster 7 Actuator motorfor passenger's side outside mirror LIN- Bus Local interconnected network bus 8 Driver's doorswitch clusterSBFA with mirror adjustment switch KL30 Terminal 30 9 Actuator motorfor driver's outside mirror KL 58g Terminal 58g 10 Photochromatic outside mirror, driver's side K-CAN BodyCAN K-CAN Signals at Footwell Module In/out Information Source Function In Status, memory position button Memory button >seat module Acquisition of outside mirror memory-position In Save memory position Memory button >seat module Saving memory-position of both outside mirrors In Vehicle speed Wheel speed sensor > dynamic stability control M irrorfold-in lock (inhibit) In Status, electrochromic interior rear-view mirror Photodiode, interior rearview mirror > roof functions center Dip outside mirror 9 E70 Outside Mirrors The instrument cluster (16) receives the value corresponding to the outside temperature from the outside temperature sensor (1) and makes it available via the K-CAN.The footwell module (15) evaluates the K-CAN signal and initiates activation of the outside mirror heating (3 and 13). The mirror adjustment motors (7 and 9) are driven by the electronic mirror module. The electronic mirror module receives the request to adjust the outside mirrors via the LIN- bus. The outside mirrors are connected via the LIN-bus. All information such as the memory position or mirrorfunctions, e.g. dip outside mirrors, is transferred via the LIN-bus. Note: The footwell module is the central control unitforthe outside mirror functions. The outside mirrors with memory function, photochromatic function and the fold-in function are connected with the LIN-bus. 10 E70 Outside Mirrors Functions The following outside mirrorfunctions are possible depending on the vehicle equipment: • M irror adjustment in up/down and left/right directions. • M irror heating. • M irror fold-in. • Photochromatic mirror, outside mirror with memory function. • Automatic parking function. • M anual adjustment. • M otor protection by repeat interlock. Mirror Adjustment Outside Mirror Adjustment (Standard) The mirrors can be moved up or down as well as left or right when the mirror adjustment switch is operated. The mirror adjustment switch activates the adjustment motors directly. The mirror selector switch in the driver's door switch cluster is used to select between the outside mirror adjustmentforthe driver's door and passenger's door. The actuator drive unit comes up against a slip clutch when the outside mirror reaches the end stop. This clutch protects the components of the outside mirrorfrom mechani¬ cal damage. Outside Mirror Adjustment (Photochromatic) The driver's door switch cluster is connected via the LIN-bus to the footwell module. The footwell module checks the status of the mirror adjustment switch every 20 ms. The electronics in the driver's door switch cluster evaluates the mirror adjustment switch and sends the signal via the LIN-bus to the footwell module. In turn, the footwell module initi¬ ates activation of the adjustment motors. To protect the mirror drive unit, the mirror adjustment is limited to a maximum activation time of 10 s. Activation is maintained within this period of 10 s until the mirror adjust¬ ment switch is released. Activation is also maintained until the outside mirror blocks or reaches its end position. Detecting Position of Outside Mirrors The Photochromatic outside mirrors have two potentiometers that register the mirror adjustment. The potentiometers receive their 5 V voltage supply from the electronic mir¬ ror module. The determined values of the potentiometers are stored in the footwell mod¬ ule forthe memory function. 11 E70 Outside Mirrors Mirror Heating The mirror heating is operable as from terminal 15 ON. On the standard varientthe mirror heating is activated by the junction box control unit. On the Photochromatic mirrorthe mirror heating is activated by the footwell module. The corresponding information is passed on to the electronic mirror module via the LIN-bus. • The instrument cluster makes available the outside temperature value via the K- CAN. • The junction box control unit provides the information forthe wipers via the K-CAN. • The percentage switch-on time is calculated from both values in the footwell module. The following table shows the values forthe percentage ON time. Temperature in °C <-10 -10 to 5 5 to 15 15 to 25 25 to 35 >35 Heating capacity in % 100 75 50 0 0 0 Heating capacity with wipers 0 N in % 100 100 75 50 25 0 The percentage increase is still retained for 300 s afterthe wiper is switched off. The maximum electric heating output is 28 W that is set by means of voltage and current measurement in the mirror. Low Voltage The electronic mirror module switches off the mirror heating in the event of a low voltage condition. • This has a positive effect on the charge balance of the battery. The cutout threshold is at 10.8V. • The electronic mirror module switches on the mirror heating again as from a voltage of 11.6V. Terminal 50 During the start procedure, the starter outputs the "terminal 50 ON" status and the mirror heating is switched off during this period of time. 12 E70 Outside Mirrors Auxiliary Heater The mirror heating is switched on despite "terminal 15 OFF" in connection with the auxil¬ iaryheating (independent heating) system, the information for the mirror heating is provid¬ ed via the K-CAN.The outside mirror heating is limited to 300 s when the auxiliary heat¬ ing system is active. Mirror Fold-in The mirrorfold-in function is controlled by the footwell module. Forthis purpose, the footwell module requests the status of the mirrorfold in switch. The driver's switch clus¬ ter evaluates the mirrorfold-in switch and forwards the request via the LIN-bus.The footwell module initiates the fold-in function. The electronic mirror module receives the request and executes this function by activat¬ ing the corresponding fold-in motor. The footwell module receives the request via the LIN-bus. Both outside mirrors are folded in towards the vehicle thus reducing the vehicle width. Photochromatic Outside Mirrors The automatic dip function (auto dimming) of the outside mirrors is dependent on the setting of the interior rear-view mirror. The function is available as from "terminal 15 ON". The interior rear-view mirror sends the request to dip the mirrors directly to the roof func¬ tions center. In turn, the roof functions center makes the request available on the K-CAN. The footwell module sends this request via the LIN-bus to the electronics in the outside mirrors. Outside Mirrorwith Memory Function The outside mirror High features a memory function that is stored in the footwell module. Three memory locations are available forthis purpose:They are: • Current position when leaving the vehicle • Memory position of memory button 1 • Memory position of memory button 2 Remote Control Up to three personalizable remote controls are possible per vehicle. When the vehicle is locked using the remote control, the current mirror position is stored in the memory location for the key memory of the remote control currently used. As a result, the mirror position last set, referred to the remote control used, is always reassumed when the vehicle is unlocked. 13 E70 Outside Mirrors Storing Memory Position The position of the outside mirrors is stored in the footwell module by pressing the "M" button followed by pressing one of the memory buttons within 7s. The driver's seat mod¬ ule evaluates the memory buttons and sends this information via the K-CAN. Calling Up Memory Position When the memory button is pressed, the driver's seat module receives the request to adjust the outside mirrors to the memory position. The driver's seat module sends this request on the K-CAN. The footwell module evaluates the request and activates the memory position. Automatic Parking Function The outside mirror on the front passenger's side is swivelled downward when reverse gear is engaged so that the curb can be easily viewed. The automatic parking function is activated underfollowing conditions: • Terminal 15 ON and • Reverse gear signal and • Mirror selector switch set to driver position. Note: The footwell module receives the reverse gearsignal via the K-CAN. The automatic transmission control unit then makes this signal available. Folding Mirror Manually The outside mirrors can be folded in or out manually. The mirrors could loose their set position when folded in or out manually. It may be therefore necessary to fold them out and fold them in and then back out again to reset them. 14 E70 Outside Mirrors Components The following components are installed in the E70 forthe purpose of operating the out¬ side mirrors: • Driver's door switch cluster with - Outside mirror adjustment switch - Outside mirror selector switch - LIN-bus link • Outside mirrors • Footwell module • J unction box control unit • Components for comfort/convenience function - Car access system 3 - Driver's door lock cylinder - Remote control receiver in diversity module. Driver's Door Switch Cluster The driver's door switch cluster is connected via the LIN-bus to the footwell module. The adjustment motors in the Low version of the outside mirrors are controlled directly by the mirror adjustment switch in the driver's door switch cluster. The driver's door switch cluster in the High version of the outside mirrors is connected to the outside mirrors via the LIN-bus. The electronic mirror module in the outside mirrors evaluates the LIN-bus signals and activates the adjustment motors. Note: The driver's door switch cluster is connected to terminal 30g, terminal 31 and terminal 58g. 15 E70 Outside Mirrors Drive Unit The drive unit is accommodated in the housing of the outside mirror. Two different drive units are installed: • Drive unit without memory function • Drive unit with memory function Drive Unit without Memory The drive unit without memory function consists of: • Two DC motors with attached step-down gear mechanism and a slip clutch in the end positions • M irror heating • Plug connection integrated in the housing • Integrated interference suppression components Drive Unit with Memory The drive unit with memory function additionally consists of the following components: • Electronic mirror module • Position potentiometer • Folding mirror motor • LIN-bus • Photochromatic glass Footwell Module The masterfunction for controlling the outside mirrors is integrated in the footwell mod¬ ule. On vehicles with memory function, the mirror position of the respective memory but¬ ton (driver's seat) is stored in the footwell module. The outside mirrors (high) and the dri¬ ver's door switch cluster are connected to the footwell module via the LIN-bus. The out¬ side mirrorfunctions are activated via the LIN-bus. J unction Box Control Unit The junction box control unit powers the low version of the outside mirror heating sys¬ tem. The signal is pulse width-modulated and has a frequency of 1 Hz. Roof Functions Center The roof functions center serves the purpose of linking the interior rear-view mirrorforthe "automatic dipping/anti-dazzle" function of the outside mirrors. 16 E70 Outside Mirrors