Electrical system

Chapter overview

• Technical data
  1
• 1 Safety instructions
  1
• 1.1 Safety precautions during a test drive with measuring and testing equipment
  1
• 2 Repair instructions
  2
• 2.1 Cleaning rules
  2
• 2.2 General Notes
  2
• 2.3 Contact corrosion
  2
• 2.4 Cable routing
  2
• 3 Battery
  4
• 3.1 Battery - general guidelines
  4
• 3.2 Battery Types
  4
• Starter, current supply, CCS
  5
• 1 Battery
  5
• 1.1 Battery A - installation overview
  5
• 1.2 Battery A - remove and install
  6
• 1.3 Battery A - disconnect and connect
  8
• 1.4 Battery Console A - remove and install
  10
• 1.5 Battery - check
  11
• 1.6 Battery - charging
  11
• 2 Alternator
  12
• 2.1 Generator (Alternator c) - assembly overview
  12
• 2.2 Generator (Alternator c) - remove and install
  13
• 2.3 Alternator - check
  15
• 2.4 Poly-V belt pulley - remove and install
  15
• 2.5 Voltage regulator - remove and install
  24
• 3 Starter
  28
• 3.1 Starter - assembly overview
  28
• 3.2 Starter - remove and install
  29
• 3.3 Starter - check
  34
• 4 Cruise control system (GRA)
  35
• 5 Adaptive Cruise Control
  36
• Gauges, instruments
  37
• 1 Instrument cluster
  37
• 1.1 Instrument cluster KX2 - assembly overview
  37
• 1.2 Instrument cluster KX2 - remove and install
  37
• 2 Horn
  42
• 2.1 Horn - assembly overview
  42
• 2.2 Bass horn H7/Treble horn H2 - remove and install
  43
• Windscreen wash/wipe system
  45
• 1 Wiper system
  45
• 1.1 Wiper system - assembly overview
  45
• 1.2 Place the wiper system in service position
  47
• 1.3 Window wiper blade - remove and install
  47
• 1.4 Wiper arm - remove and install
  48
• 1.5 Wiper arms - adjust resting position
  50
• 1.6 Wiper motor V - remove and install
  52
• 1.7 Wiper motor APS function - disable
  54
• 1.8 Rain and light sensor G397 - remove and install
  55
• 1.9 Rain and light sensor G397 - repair
  58
• 2 Windscreen washer system
  60
• 2.1 Windscreen washer system - assembly overview
  60
• 2.2 Washer water reservoir - remove and install
  62
• 2.3 Windscreen washer fluid level sender - remove and install
  63
• 2.4 Windscreen washer pump - remove and install
  64
• 2.5 Spray jets - remove and install
  65
• 2.6 Spray nozzles - adjust
  66
• 3 Rear window wiper system
  68
• 3.1 Rear window wiper system - assembly overview
  68
• 3.2 Rear wiper blade - remove and install
  69
• 3.3 Rear window wiper arm - remove and install
  69
• 3.4 Rear window wiper arm - adjust
  71
• 3.5 Rear window wiper motor V12- remove and install
  71
• 4 Rear window washer system
  74
• 4.1 Rear window washer system - assembly overview
  74
• 4.2 Washer water reservoir - remove and install
  75
• 4.3 Rear window washer pump - remove and install
  75
• 4.4 Washer jet - remove and install
  75
• 4.5 Washer jet - adjust
  75
• 5 Washer fluid lines
  77
• 5.1 Washer fluid lines - repair
  77
• Lights, bulbs, switches - exterior
  78
• 1 Headlights
  78
• 1.1 Headlights - assembly overview
  78
• 1.2 Headlight - remove and install
  79
• 1.3 Headlight - adjust
  83
• 1.4 Headlight - correct alignment position
  84
• 1.5 Daytime running light LED module L176/L177 - remove and install
  86
• 2 Fog lights
  88
• 2.1 Fog lights - Assembly overview
  88
• 2.2 Fog lights - remove and install
  88
• 2.3 Fog light - adjust
  89
• 3 Turn signal in the exterior mirror housing
  90
• 3.1 Steering indicator on the exterior mirror - Remove and Install
  90
• 4 Tail lights
  91
• 4.1 Tail lights, body - assembly overview
  91
• 4.2 Tail lights, boot lid - assembly overview
  91
• 4.3 Tail light lamp support - remove and install
  93
• 4.4 Tail light, body - remove and install
  94
• 4.5 Tail light, boot lid - remove and install
  94
• 4.6 Tail light installation position - adjust
  96
• 4.7 Turn signal bulb - remove and install
  97
• 5 License plate bulb
  99
• 5.1 License plate bulb X4/X5 - remove and install
  99
• 5.2 Number plate light X4 / X5 - remove and install
  100
• 6 Auxiliary brake light
  101
• 6.1 Auxiliary brake light - assembly overview
  101
• 6.2 Auxiliary brake light - remove and install
  101
• 7 Access and departure authorization
  103
• 7.1 Access and departure authorization system - overview of fitting locations
  103
• 7.2 Keyless access authorization system (Kessy) - overview of fitting locations
  104
• 7.3 Interface for access and starting system J518 - remove and install
  105
• 7.4 Front door handle contact sensor G605 / G606 - remove and install
  107
• 8 Steering column switch module
  111
• 8.1 Steering column switch module - assembly overview
  111
• 8.2 Lock cylinder - remove and install
  113
• 8.3 Ignition key withdrawal lock solenoid N376 - remove and install
  116
• 8.4 Ignition/starter switch - remove and install
  116
• 8.5 Steering column switch module J527 - remove and install
  117
• 8.6 Flashing/turn light switch E2 - remove and install
  120
• 8.7 Cruise control system switch E45 - remove and install
  122
• 8.8 Window wiper timer switch E22 - remove and install
  122
• 8.9 Steering lock set - remove and install
  122
• 9 Parking aid
  125
• Lights, bulbs, switches - interior
  126
• 1 Lights
  126
• 1.1 Centre console lights - assembly overview
  126
• 1.2 Luggage compartment lights - overview of fitting locations
  127
• 1.3 Headliner lights - overview of fitting locations
  128
• 1.4 “SAFE” central locking system indicator lamp K133 - remove and install
  129
• 1.5 Selector lever position display Y26 - remove and install
  130
• 1.6 Boot light W3 - remove and install
  130
• 1.7 Bulb of the Luggage compartment light W3 - remove and install
  131
• 1.8 Passenger illuminated vanity mirror W49/W50 - remove and install
  132
• 1.9 Front interior light WX1- replace bulb
  133
• 1.10 Internal rear light WX2- replace bulb
  134
• 1.11 Rear reading light bulb W11/W12 - remove and install
  135
• 2 Control elements
  136
• 2.1 Dash panel control elements - assembly overview
  136
• 2.2 Front door control elements - assembly overview
  137
• 2.3 Rear door control elements - assembly overview
  138
• 2.4 Centre console control elements - assembly overview
  139
• 2.5 Luggage compartment control elements - assembly overview
  140
• 2.6 Headliner control elements - assembly overview
  141
• 2.7 Rotary light switch EX1 - remove and install
  143
• 2.8 Headlight beam range adjustment control E102 - remove and install
  144
• 2.9 Auxiliary function switch for parking manoeuvres E266 - remove and install
  145
• 2.10 Passenger airbag off control light K145 - remove and install
  145
• 2.11 Centre console switch module - remove and install
  146
• 2.12 Warning light switch EX3 - removal and install
  147
• 2.13 Exterior mirror adjustment EX11 - remove and install
  148
• 2.14 Driver door window control unit EX36 - remove and install
  148
• 2.15 Front passenger window control switch EX27 - remove and install
  149
• 2.16 Driver side interior locking switch E308 - remove and install
  150
• 2.17 Contact switch F2/F3 - remove and install
  150
• 2.18 Rear door window control unit EX28/EX29 - remove and install
  150
• 2.19 Contact switch F10/F11 - remove and install
  151
• 2.20 Starting system switch E378 - remove and install
  151
• 2.21 Rear lid contact switch - remove and install
  152
• 2.22 Vanity mirror contact switch F298/F299 - remove and Install
  152
• 2.23 Front reading/background light - remove and install
  153
• 2.24 Reading lighting switch - remove and install
  156
• 3 Anti-theft alarm system
  159
• 3.1 Interior monitoring - assembly overview
  159
• 3.2 Alarm system sensor G578 - remove and install
  159
• 4 Immobilizer
  161
• 4.1 Immobilizer control unit - remove and install
  161
• 4.2 Immobilizer reading coil - remove and install
  161
• 5 Lighter, socket
  163
• 5.1 Lighter U1 - remove and install
  163
• 5.2 Electric socket U - remove and install
  163
• 5.3 Rear cigarette lighter illumination bulb L32- remove and install
  163
• Wiring
  164
• 1 Relay carrier, fuse holder, electronic boxes
  164
• 1.1 Relay carrier, fuse holder, E-boxes - assembly overview
  164
• 1.2 Fuse holder A SA - assembly overview
  166
• 1.3 E-Box in engine compartment - remove and install
  167
• 1.4 Relay carrier and Fuse holder B - remove and install
  170
• 1.6 Fuse carrier A SA - remove and install
  174
• 2 Control units
  177
• 2.1 Control units - assembly overview
  177
• 2.2 Control unit for the on-board electrical system J519 - remove and install
  177
• 2.3 Data bus diagnostics interface J533 - remove and install
  179
• 2.5 Support of the Parking aid control unit J446 - remove and install
  180
• 3 Connector connections
  181
• 3.1 Wiring harnesses and connections - repair
  181
• 4 Connector housings - unlock and disassemble
  182
• 5 Aerial cables - repair
  183
• 6 Fibre optic cables
  184
• 7 Vehicle diagnostic, testing and information system
  185