Electrical system

Chapter overview

• Technical data
  1
• 1 Safety information
  1
• 1.1 Safety measures when working on vehicles with a start/stop system
  1
• 1.3 Operation and safety notes for gas discharge lamps
  2
• 2 Repair notes
  4
• 2.1 Contact corrosion
  4
• 2.2 Routing and attachment of lines
  4
• 3 Battery
  5
• 3.1 Types of battery
  5
• 3.2 Battery - general notes
  5
• Starter, current supply, CCS
  6
• 1 Battery
  6
• 1.1 Assembly overview - battery
  6
• 1.2 Removing and installing battery
  9
• 1.3 Disconnecting and connecting battery
  12
• 1.4 Removing and installing battery tray
  16
• 1.5 Checking battery
  18
• 1.6 Charging battery
  18
• 1.7 Removing and installing earth wire with battery monitor control unit J367
  18
• 1.8 Adapting battery monitor control unit J367
  21
• 2 Alternator
  22
• 2.1 Assembly overview - alternator
  22
• 2.2 Removing and installing alternator
  24
• 2.3 Checking alternator
  40
• 2.4 Checking poly V-belt
  40
• 2.5 Removing and installing poly V-belt pulley
  41
• 2.6 Removing and installing voltage regulator
  48
• 3 Starter motor
  52
• 3.1 Assembly overview - starter
  52
• 3.2 Removing and installing starter motor
  54
• 3.3 Checking starter
  61
• 4 Cruise control system (CCS)
  62
• 5 Start/stop system
  63
• 5.1 General description - start/stop system
  63
• 5.2 Removing and installing voltage stabiliser
  65
• 6 Adaptive cruise control
  66
• 6.1 Overview of fitting locations - adaptive cruise control
  66
• 6.2 Removing and installing automatic distance control unit
  67
• 6.3 Calibrating adaptive cruise control
  70
• Gauges, instruments
  71
• 1 Dash panel insert
  71
• 1.1 Assembly overview - dash panel insert
  71
• 1.2 Removing and installing dash panel insert KX2
  72
• 1.3 Multi-pin connector pin assignment on dash panel insert
  73
• 1.4 Removing and installing ambient temperature sensor
  74
• 2 Horn
  75
• 2.1 Assembly overview - horn
  75
• 2.2 Removing and installing treble horn H2 and bass horn H7
  75
• Windscreen wash/wipe system
  77
• 1 windscreen wiper system
  77
• 1.1 Assembly overview - windscreen wiper system
  77
• 1.2 Moving wipers to service position
  78
• 1.3 Removing and installing wiper blade
  78
• 1.4 Removing and installing wiper arms
  79
• 1.5 Adjusting wiper arms
  81
• 1.6 Removing and installing wiper motor V
  82
• 1.7 Removing and installing rain and light sensor
  85
• 1.8 Repairing rain and light sensor
  87
• 2 Windscreen washer system
  89
• 2.1 Assembly overview - windscreen washer system
  89
• 2.2 Removing and installing washer fluid reservoir
  90
• 2.3 Removing and installing windscreen washer fluid level sender
  91
• 2.4 Removing and installing windscreen washer pump
  92
• 2.5 Removing and installing washer jets
  93
• 2.6 Adjusting spray jets
  93
• 3 Headlight washer system
  94
• 3.1 Assembly overview - headlight washer system
  94
• 3.2 Removing and installing headlight washer system pump V11
  94
• 3.3 Removing and installing washer jets
  95
• 3.4 Adjusting spray jets
  96
• 3.5 Removing and installing pop-up cylinder
  96
• 4 Washer fluid lines
  98
• 4.1 Repairing washer fluid lines
  98
• Lights, bulbs, switches - exterior
  99
• 1 Headlights
  100
• 1.1 Assembly overview - headlight
  100
• 1.2 Removing and installing headlight
  106
• 1.3 Adjusting headlights
  107
• 1.4 Adjusting headlight installation position
  108
• 1.5 Removing and installing front turn signal bulb M5 / M7
  109
• 1.6 Installing repair kit for headlight housing
  112
• 1.7 Converting headlights from driving on right to driving on left
  116
• 1.8 Converting headlights from driving on left to driving on right
  117
• 1.9 Removing and installing headlight range control motor V48 / V49
  119
• 1.10 Removing and installing dipped beam bulb
  120
• 1.11 Removing and installing headlight main beam bulb M30 / M32
  121
• 1.12 Removing and installing gas discharge bulb L13 / L14
  122
• 1.13 Removing and installing side light bulb M1 / M3
  124
• 1.14 Removing and installing daytime running light bulb L174 / L175
  125
• 1.15 Removing and installing daytime running light
  127
• 1.16 Removing and installing headlight screen adjustment solenoid
  128
• 1.17 Removing and installing swivel module position sensor G474 / G475
  128
• 1.18 Removing and installing bulbs for cornering light L148 / L149
  128
• 1.19 Removing and installing gas discharge bulb control unit J343 / J344
  130
• 1.20 Removing and installing output module for headlight J667 / J668
  130
• 1.21 Removing and installing control unit for daytime running light and side light J860 / J861
  131
• 2 Fog lights
  133
• 2.1 Assembly overview - fog lights
  133
• 2.2 Removing and installing fog light
  135
• 2.3 Removing and installing fog light bulb L22 / L23
  138
• 2.4 Adjusting fog lights
  139
• 3 Side marker light
  140
• 3.1 Removing and installing side marking light bulb
  140
• 4 Lights in exterior mirror
  142
• 4.1 Assembly overview - lights in exterior mirror
  142
• 4.2 Removing and installing turn signal repeater bulb L131 / L132
  143
• 4.3 Removing and installing entry light in exterior mirror
  144
• 5 Tail lights
  145
• 5.1 Assembly overview - tail lights in body
  145
• 5.2 Assembly overview - tail lights in rear lid
  147
• 5.3 Removing and installing bulb carrier
  149
• 5.4 Removing and installing tail light in rear lid
  150
• 5.5 Removing and installing tail light
  151
• 5.6 Removing and installing tail light bulb M2 / M4
  151
• 5.7 Removing and installing rear fog light
  152
• 5.8 Removing and installing brake and tail light bulb M21 / M22
  152
• 5.9 Removing and installing reversing light bulb
  153
• 5.10 Removing and installing turn signal bulb
  154
• 6 High-level brake light
  156
• 6.1 Assembly overview - high-level brake light
  156
• 6.2 Removing and installing additional brake light
  156
• 6.3 Removing and installing high-level brake light
  157
• 7 Number plate light
  158
• 7.1 Removing and installing number plate light X4 / X5
  158
• 7.2 Removing and installing bulb for number plate light X4 / X5
  158
• 8 Entry and start authorisation system
  159
• 8.1 Overview of fitting locations - entry and start authorisation system
  159
• 8.2 Removing and installing entry and start authorisation control unit J518
  162
• 8.3 Removing and installing interior aerial 1 for entry and start authorisation R138
  164
• 8.4 Removing and installing interior aerial 2 for entry and start authorisation R139
  164
• 8.6 Removing and installing driver side aerial for entry and start system R134
  165
• 8.8 Removing and installing rear bumper aerial for entry and start system R136
  166
• 8.9 Checking entry and start system aerials and sensors
  167
• 9 Steering column switch module
  169
• 9.1 Assembly overview - steering column switch module
  169
• 9.2 Removing and installing steering column electronics control unit J527
  172
• 9.3 Removing and installing steering column combination switch
  177
• 9.4 Removing and installing base for steering column combination switch
  187
• 9.5 Removing and installing electronic steering column lock control unit J764
  195
• 9.6 Removing and installing ignition/starter switch
  196
• 9.7 Checking ignition/starter switch
  197
• 9.8 Removing and installing lock cylinder
  198
• 9.9 Removing and installing steering lock housing
  200
• 9.10 Removing and installing ignition key withdrawal lock solenoid N376
  200
• 10 Parking aid
  202
• 10.1 Assembly overview – parking aid
  202
• 10.2 Removing and installing parking aid control unit J446
  205
• 10.3 Removing and installing front parking aid warning buzzer H22
  206
• 10.4 Removing and installing rear parking aid warning buzzer H15
  207
• 10.5 Removing and installing front parking aid senders
  208
• 10.6 Removing and installing rear parking aid senders
  212
• 11 Main beam assist
  217
• 11.1 Overview - main beam assist
  217
• 11.2 Overview of fitting locations - main beam assist
  217
• 11.3 Removing and installing main beam assist control unit J844
  218
• 11.4 Renewing main beam assist control unit J844
  219
• 11.5 Coding main beam assist control unit J844
  219
• 11.6 Removing and installing light sensor G399
  219
• 12 Automatic headlight range control
  220
• 12.1 Assembly overview - automatic headlight range control
  220
• 12.2 Removing and installing headlight range control unit
  221
• 13 Towing bracket
  223
• 13.1 Assembly overview - towing bracket socket
  223
• 13.2 Removing and installing trailer detector control unit J345
  223
• 13.3 Trailer socket
  224
• 14 Blind Spot Monitor
  226
• 14.1 Assembly overview - blind spot monitor
  226
• 14.2 Removing and installing warning lamp for Blind Spot Monitor K303 / K304
  226
• 14.3 Removing and installing blind spot monitor control unit J1086 / J1087
  227
• 14.4 Calibrating Blind Spot Monitor
  228
• Lights, bulbs, switches - interior
  235
• 1 Lights
  235
• 1.1 Overview of fitting locations - lights in dash panel
  235
• 1.2 Overview of fitting locations - lights in luggage compartment
  237
• 1.3 Overview of fitting locations - lights in roof trim
  238
• 1.4 Removing and installing glove compartment light W6
  238
• 1.5 Removing and installing Central locking SAFELOCK function warning lamp K133
  240
• 1.6 Removing and installing luggage compartment light W3
  241
• 1.7 Removing and installing illuminated vanity mirror W20 / W14
  242
• 1.8 Renewing front interior light bulb W1 / W13 / W19
  243
• 1.9 Removing and installing centre reading lights
  245
• 1.10 Renewing bulb of rear interior light W47 / W48
  245
• 2 Controls
  248
• 2.1 Overview of fitting locations - controls in dash panel
  249
• 2.2 Overview of fitting locations - controls in front doors
  250
• 2.3 Overview of fitting locations - controls in rear doors
  251
• 2.4 Overview of fitting locations - controls in centre console
  252
• 2.5 Overview of fitting locations - controls in roof trim
  253
• 2.6 Removing and installing rotary light switch EX1
  253
• 2.7 Removing and installing regulator for switch and instrument illumination E20
  255
• 2.8 Removing and installing tyre pressure monitor display button E492
  256
• 2.9 Removing and installing rear ear interior locking switch E273 / E274
  257
• 2.10 Removing and installing driver side interior locking button for central locking system E308
  258
• 2.12 Removing and installing remote release button for fuel filler flap and rear lid E463
  260
• 2.13 Removing and installing Start/Stop operation button E693
  261
• 2.14 Removing and installing TCS and ESP button E256
  262
• 2.15 Removing and installing parking aid button E266
  262
• 2.16 Removing and installing the starter button E378
  262
• 2.17 Removing and installing button for electric drive E656 , high-voltage vehicle
  263
• 2.19 Removing and installing hazard warning light button E229
  264
• 2.20 Removing and installing glove compartment light switch E26
  264
• 2.21 Removing and installing mirror adjustment switch E43 / E168
  265
• 2.22 Removing and installing operating unit for window regulator in driver door E512
  266
• 2.23 Removing and installing window regulator switch in front passenger door E107
  267
• 2.24 Removing and installing interior monitoring deactivation switch E267
  269
• 2.25 Removing and installing rear window regulator button E700 / E705
  270
• 2.26 Removing and installing rear lid contact switch
  271
• 2.27 Removing and installing sunroof button E325
  271
• 2.28 Removing and installing front interior light/reading light
  272
• 2.29 Removing and installing rear interior light/reading light
  274
• 2.30 Removing and installing garage door operating unit E284
  275
• 3 Anti-theft alarm
  277
• 3.1 Assembly overview - interior monitor
  277
• 3.2 Activating and deactivating anti-theft alarm
  278
• 3.3 Central locking and anti-theft alarm system aerial R47
  279
• 3.4 Removing and installing alarm horn H12
  279
• 3.5 Removing and installing interior monitoring sensor G273
  280
• 3.6 Removing and installing bonnet contact switch F266
  280
• 3.7 Adaptations of anti-theft alarm system
  280
• 4 Immobiliser
  282
• 4.1 Removing and installing immobiliser control unit
  282
• 4.2 Removing and installing immobiliser reader coil
  284
• 4.3 Ignition key
  284
• 5 Cigarette lighter, socket
  286
• 5.1 Removing and installing AC/DC converter with socket
  286
• Wiring
  289
• 1 Relay carriers, fuse holders, electronics boxes
  289
• 1.1 Overview of fitting locations - relay carriers, fuse holders, E-boxes
  289
• 1.2 Removing and installing electronics box (E-box)
  290
• 1.3 Removing and installing relay and fuse holder in electronics box
  291
• 1.4 Removing and installing relay and fuse holder behind dash panel on driver side
  292
• 1.5 Removing and installing fuse holder on battery, high-voltage vehicle
  294
• 2 Select Control units
  295
• 2.1 Overview of fitting locations - control units
  295
• 2.2 Removing and installing onboard supply control unit J519
  296
• 2.3 Removing and installing data bus diagnostic interface J533
  302
• 2.4 Removing and installing garage door operation control unit
  304
• 3 Connectors
  305
• 3.1 Separating left door connector
  305
• 3.2 Separating right door connector
  306
• 3.3 Repairing electrical wiring harnesses and plug-in connections
  306
• 4 Releasing and dismantling connector housings
  307
• 5 Repairing aerial cables
  308
• 6 Fibre optic cables
  309
• 7 Vehicle diagnosis, testing and information systems
  310