Electrical system

Chapter overview

• Technical data
  1
• 1 \--- Change history ---
  1
• 2 Safety instructions
  2
• 2.1 Safety measures for work on vehicles with Start-Stop system
  2
• 2.2 Safety precautions during a test drive with measuring and testing equipment
  2
• 3 Repair instructions
  3
• 3.1 Cleanliness rules
  3
• 3.2 General Notes
  3
• 3.3 Contact corrosion
  3
• 3.4 Cable routing
  3
• 4 Battery
  5
• 4.1 Battery - general guidelines
  5
• 4.2 Battery Types
  5
• Starter, current supply, CCS
  6
• 1 Battery
  6
• 1.1 Battery A - installation overview
  6
• 1.2 Battery A - remove and install
  7
• 1.3 Battery A - disconnect and connect
  10
• 1.4 Battery Console A - remove and install
  13
• 1.5 Battery - check
  15
• 1.6 Battery - charging
  15
• 1.7 Earth cable with Battery control unit J367 - remove and install
  15
• 1.8 Battery control unit J367 - adjust
  16
• 2 Alternator
  17
• 2.1 Generator (Alternator c) - assembly overview
  17
• 2.2 Generator (Alternator c) - remove and install
  18
• 2.3 Alternator - check
  23
• 2.4 Poly-V belt pulley - remove and install
  24
• 2.5 Voltage regulator - remove and install
  33
• 3 Starter
  37
• 3.1 Starter - assembly overview
  37
• 3.2 Starter - remove and install
  38
• 4 Cruise control system (GRA)
  44
• Gauges, instruments
  45
• 1 Instrument cluster
  45
• 1.1 Digital Cockpit - assembly overview
  45
• 1.2 Dash panel KX2 - remove and install
  45
• 2 Horn
  51
• 2.1 Horn - assembly overview
  51
• 2.2 Treble tone horn H2 and Bass tone horn H7 - remove and install
  51
• Windscreen wash/wipe system
  53
• 1 Windscreen wiper system
  53
• 1.1 Windscreen wiper system - assembly overview
  53
• 1.2 Wiper arms - adjust resting position
  55
• 1.3 Window wiper blade - remove and install
  55
• 1.4 Wiper arm - remove and install
  56
• 1.5 Windscreen wiper arms - adjust
  58
• 1.6 Wiper motor V - remove and install
  60
• 1.7 Wiper motor APP function - deactivate
  61
• 1.8 Rain and light sensor G397 - remove and install
  61
• 2 Windscreen washer system
  66
• 2.1 Windscreen washer system - assembly overview
  66
• 2.2 Washer water reservoir - remove and install
  68
• 2.3 Windscreen washer fluid level sender - remove and install
  69
• 2.4 Windscreen washer pump - remove and install
  70
• 2.5 Spray jets - remove and install
  71
• 2.6 Spray nozzles - adjust
  72
• 3 Rear window wiper system
  73
• 3.1 Rear window wiper system - assembly overview
  73
• 3.2 Rear wiper blade - remove and install
  74
• 3.3 Rear window wiper arm - remove and install
  74
• 3.4 Rear window wiper arm - adjust
  76
• 3.5 Rear window wiper motor V12- remove and install
  76
• 4 Rear window washer system
  79
• 4.1 Rear window washer system - assembly overview
  79
• 4.2 Washer water reservoir - remove and install
  80
• 4.3 Rear window washer pump - remove and install
  80
• 4.4 Washer jet - remove and install
  80
• 4.5 Washer jet - adjust
  80
• 5 Washer fluid lines
  82
• 5.1 Washer fluid lines - repair
  82
• Lights, bulbs, switches - exterior
  83
• 1 Headlights
  83
• 1.1 Headlights - assembly overview
  83
• 1.2 Headlight - remove and install
  87
• 1.3 Halogen headlight (twin) - adjust
  91
• 1.4 Headlight - correct alignment position
  91
• 1.5 Front turn signal bulb M5/M7 - replace
  93
• 1.6 Headlight housing repair kit
  94
• 1.7 Convert right-hand traffic headlight to left-hand traffic headlight
  97
• 1.8 Convert left-hand traffic headlight to right-hand traffic headlight
  97
• 1.9 Headlight beam range control motor V48 / V49 - remove and install
  98
• 1.10 Dipped beam headlight bulb - remove and install
  103
• 1.11 Main beam headlight bulb M30/M32 - remove and install
  106
• 1.12 Daytime vehicle operation light - Remove and Install
  108
• 1.13 Daytime running light LED module L176/L177 - remove and install
  109
• 1.14 LED headlight output module 1 A27/A31 - remove and install
  110
• 2 Fog lights
  112
• 2.1 Fog lights - Assembly overview
  112
• 2.2 Fog lights - remove and install
  112
• 2.3 Fog light bulb L22 / L23 - remove and install
  112
• 2.4 Fog lights - adjust
  113
• 3 Turn signal in the exterior mirror - remove and install
  114
• 4 Tail lights
  115
• 4.1 Tail lights - assembly overview
  115
• 4.2 Tail light lamp support - remove and install
  116
• 4.3 Tail light - remove and install
  117
• 4.4 Tail light installation position - adjust
  118
• 4.5 Tail light bulb M2/M4 - remove and install
  119
• 4.6 Brake light bulb and tail light bulb M21 / M22 - remove and install
  119
• 4.7 Reverse gear light bulb M16/M17 - remove and install
  120
• 4.8 Turn signal bulb - remove and install
  121
• 5 License plate bulb
  122
• 5.1 License plate bulb X4/X5 - remove and install
  122
• 5.2 Number plate light X4 / X5 - remove and install
  123
• 6 Auxiliary brake light
  124
• 6.1 Auxiliary brake light - assembly overview
  124
• 6.2 Auxiliary brake light - remove and install
  124
• 7 Access and departure authorization
  126
• 7.1 Access and departure authorization system - overview of fitting locations
  126
• 7.2 Keyless access authorization system - overview of fitting locations
  127
• 7.3 Interface for entry and start system J518 - remove and install
  128
• 7.4 Front door handle contact sensor G605 / G606 - remove and install
  130
• 7.5 Interior aerial 1 for entry and start system R138 - remove and install
  130
• 7.6 Interior aerial 2 for entry and start system R139 - remove and install
  131
• 7.9 Rear bumper aerial for entry and start system R136 - remove and install
  132
• 8 Steering column switch module
  134
• 8.1 Steering column switch module - assembly overview
  134
• 8.2 Lock cylinder - remove and install
  136
• 8.3 Ignition key withdrawal lock solenoid N376 - remove and install
  139
• 8.4 Ignition/starter switch - remove and install
  139
• 8.5 Steering column switch module J527 - remove and install
  140
• 8.6 Steering column electronics control unit J527 - remove and install
  143
• 8.7 Flashing/turn light switch E2 - remove and install
  145
• 8.8 Cruise control system switch E45 - remove and install
  147
• 8.9 Window wiper timer switch E22 - remove and install
  147
• 8.10 Base support of the steering column combined switch - remove and install
  147
• 8.11 Steering lock set - remove and install
  148
• 9 Parking aid system
  151
• 9.1 Parking aid system - assembly overview
  151
• 9.2 Front parking aid system sensor G252/G253/G254/G255 - remove and install
  154
• 9.3 Rear parking aid system sensor G203/G204/G205/G206 - remove and install
  156
• 9.4 Front parking aid sensor G568/G569 - remove and install
  157
• 9.5 Rear parking aid sensor G716/G717 - remove and install
  158
• 9.6 Warning buzzer for rear parking aid H15- remove and install
  159
• 9.7 Warning buzzer for front parking aid H22- remove and install
  160
• 9.8 Parking aid control unit J446 - remove and install
  160
• 9.9 Support of the Parking aid control unit J446 - remove and install
  161
• 9.10 Rear view camera R189 - remove and install
  162
• 10 Automatic headlight range control
  163
• 10.1 Automatic headlight range control - assembly overview
  163
• 10.2 Main beam headlight range control unit - remove and install
  164
• Lights, bulbs, switches - interior
  165
• 1 Lights
  165
• 1.1 Dash panel lights - assembly overview
  165
• 1.2 Front door lights - assembly overview
  166
• 1.3 Centre console lights - assembly overview
  167
• 1.4 Luggage compartment lights - overview of fitting locations
  168
• 1.5 Headliner lights - overview of fitting locations
  169
• 1.6 Glove compartment light W6 - remove and install
  171
• 1.7 Glove compartment light W6 bulb - replace
  172
• 1.8 Front footwell light K268/K269 - remove and install
  173
• 1.9 Front footwell light bulb L151 / L152 - remove and install
  174
• 1.10 “SAFE” central locking system indicator lamp K133 - remove and install
  174
• 1.11 Storage compartment light bulb L120 - remove and install
  175
• 1.12 Interior door handle light bulb L146/L147 - remove and install
  176
• 1.13 Left dash panel background light bulb L229 - remove and install
  177
• 1.14 Right dash panel background light bulb L230 - remove and install
  177
• 1.15 Centre dash panel background light bulb L231 - remove and install
  178
• 1.16 Selector lever position display Y26 - remove and install
  178
• 1.17 Luggage compartment light W3 - remove and install
  179
• 1.18 Luggage compartment light bulb W3 - replace
  179
• 1.19 Front interior light W1/W13/W19 - remove and install
  180
• 1.20 Rear interior light W43 - replace
  184
• 1.21 Rear reading light W11/W12 - remove and install
  185
• 2 Control elements
  186
• 2.1 Dash panel control elements - assembly overview
  186
• 2.2 Front door control elements - assembly overview
  187
• 2.3 Rear door control elements - assembly overview
  188
• 2.4 Centre console control elements - assembly overview
  189
• 2.5 Luggage compartment control elements - assembly overview
  190
• 2.6 Headliner control elements - assembly overview
  191
• 2.7 Rotary light switch EX1 - remove and install
  193
• 2.8 Headlight beam range adjustment control E102 - remove and install
  194
• 2.9 Parking aid button E266 - remove and install
  195
• 2.10 Parking aid switch E581 - remove and install
  195
• 2.11 Start/Stop function switch E693 - remove and install
  195
• 2.12 Driving mode selection button E735 - remove and install
  196
• 2.13 Front passenger airbag activation/deactivation button K145 - remove and install
  196
• 2.14 Module 1 of the centre console EX23- remove and install
  196
• 2.15 Hazard light switch EX3 - remove and install
  197
• 2.16 Glove compartment light switch E26 - remove and install
  197
• 2.17 Exterior mirror adjustment EX11 - remove and install
  198
• 2.18 Driver door window control unit EX36 - remove and install
  199
• 2.19 Front passenger window control switch EX27 - remove and install
  200
• 2.21 Contact switch F2/F3 - remove and install
  201
• 2.22 Rear door window control unit EX28/EX29 - remove and install
  201
• 2.23 Contact switch F10/F11 - remove and install
  202
• 2.24 Starter button E378 - remove and install
  202
• 2.25 Rear lid contact switch - remove and install
  203
• 2.26 Front reading/background light - remove and install
  203
• 2.27 Reading lighting switch - remove and install
  206
• 3 Anti-theft alarm system
  209
• 3.1 Interior monitoring - assembly overview
  209
• 3.2 Anti-theft alarm sensor G578 - remove and install
  209
• 4 Immobilizer
  211
• 4.1 Immobilizer control unit - remove and install
  211
• 4.2 Immobilizer reading coil - remove and install
  211
• 5 12-volt socket, cigarette lighter
  213
• 5.1 Cigarette lighter U1 - remove and install
  213
• 5.2 Socket box light bulb L42 - remove and install
  213
• 5.3 Rear cigarette lighter light bulb L32 - remove and install
  213
• 5.4 U- Socket - remove and install
  213
• Wiring
  214
• 1 Relay carrier, fuse holder, electronic boxes
  214
• 1.1 Relay carrier, fuse holder, E-Box - assembly overview
  214
• 1.2 Fuse holder A SA - assembly overview
  216
• 1.3 E-Box in engine compartment - remove and install
  217
• 1.4 Relay carrier and Fuse holder B - remove and install
  220
• 1.6 Fuse carrier A SA - remove and install
  224
• 2 Control units
  227
• 2.1 Control units - assembly overview
  227
• 2.2 Control unit for the on-board electrical system J519 - remove and install
  227
• 2.3 Support of the On-board supply control unit J519 - remove and install
  229
• 2.4 Support of the Parking aid control unit J446 - remove and install
  229
• 3 Connector connections
  231
• 3.1 Wiring harnesses and connections - repair
  231
• 4 Connector housings - unlock and disassemble
  232
• 5 Aerial cables - repair
  233
• 6 Fibre optic cables
  234
• 7 Vehicle diagnostic, testing and information system
  235