Electrical system

Chapter overview

• Technical data
  1
• 1 Safety information
  1
• 1.1 Safety measures for working on vehicles with high-voltage system
  1
• 1.2 Safety precautions when working in the vicinity of high-voltage components
  2
• 1.3 Safety measures when working on vehicles with a start/stop system
  2
• 2 Repair instructions
  3
• 2.1 Contact corrosion
  3
• 2.2 Routing and attachment of lines
  3
• 3 Battery
  4
• 3.1 Battery - general notes
  4
• 3.2 Types of battery
  4
• Starter, current supply, CCS
  5
• 1 Battery
  5
• 1.1 Assembly overview - battery
  5
• 1.2 Removing and installing battery
  9
• 1.3 Disconnecting and connecting battery
  20
• 1.4 Removing and installing battery tray
  24
• 1.6 Checking battery
  26
• 1.7 Charging battery
  27
• 1.8 Removing and installing earth wire with battery monitor control unit J367
  27
• 1.9 Adapting battery monitor control unit J367
  30
• 2 Alternator
  31
• 2.1 Assembly overview - alternator
  31
• 2.2 Removing and installing alternator
  33
• 2.3 Checking alternator
  44
• 2.4 Removing and installing poly V-belt pulley
  44
• 2.5 Removing and installing voltage regulator
  53
• 3 Starter motor
  57
• 3.1 Assembly overview – starter
  57
• 3.2 Removing and installing starter
  59
• 4 Cruise control system (CCS)
  67
• 5 Start/stop system
  68
• 5.1 General description - start/stop system
  68
• 5.2 Overview of fitting locations - start/stop system
  68
• 6 Adaptive cruise control
  70
• 6.1 Overview of fitting locations - adaptive cruise control
  70
• 6.2 Removing and installing automatic distance control unit
  72
• 6.3 Calibrating adaptive cruise control
  77
• Gauges, instruments
  78
• 1 Dash panel insert
  78
• 1.1 Assembly overview - dash panel insert
  78
• 1.2 Removing and installing dash panel insert KX2
  81
• 2 Horn
  86
• 2.1 Assembly overview - horn
  86
• 2.2 Removing and installing treble horn H2 and bass horn H7
  86
• Windscreen wash/wipe system
  89
• 1 Windscreen wiper system
  89
• 1.1 Assembly overview - windscreen wiper system
  89
• 1.2 Moving wipers to service position
  91
• 1.3 Removing and installing wiper blade
  91
• 1.4 Removing and installing wiper arms
  93
• 1.5 Adjusting wiper arms
  95
• 1.6 Removing and installing wiper motor V
  97
• 1.7 Deactivating APP function of wiper motor
  98
• 1.8 Removing and installing rain and light sensor
  99
• 2 Windscreen washer system
  103
• 2.1 Assembly overview - windscreen washer system
  103
• 2.2 Removing and installing washer fluid reservoir
  109
• 2.3 Removing and installing windscreen washer fluid level sender
  114
• 2.4 Removing and installing windscreen washer pump
  116
• 2.5 Removing and installing spray jets
  118
• 2.6 Adjusting spray jets
  119
• 3 Rear window wiper system
  120
• 3.1 Assembly overview - rear window wiper system
  120
• 3.2 Removing and installing wiper blade
  120
• 3.3 Removing and installing wiper arm
  121
• 3.4 Adjusting wiper arm
  122
• 3.5 Removing and installing rear window wiper motor V12
  123
• 4 Rear window washer system
  125
• 4.1 Assembly overview - rear window washer system
  125
• 4.2 Removing and installing washer fluid reservoir
  128
• 4.3 Removing and installing rear window washer pump
  128
• 4.4 Removing and installing spray jet
  129
• 4.5 Adjusting spray jet
  130
• 5 Headlight washer system
  131
• 5.1 Assembly overview - headlight washer system
  131
• 5.2 Removing and installing washer fluid reservoir
  133
• 5.3 Removing and installing headlight washer system pump V11
  133
• 5.4 Removing and installing pop-up cylinder
  135
• 5.5 Adjusting spray jets
  139
• 6 Washer fluid lines
  140
• 6.1 Repairing washer fluid lines
  140
• Lights, bulbs, switches - exterior
  141
• 1 Headlights
  141
• 1.1 Assembly overview - headlight
  141
• 1.2 Removing and installing headlight
  149
• 1.3 Adjusting headlights
  153
• 1.4 Adjusting headlight installation position
  153
• 1.5 Removing and installing front turn signal bulb M5/M7
  156
• 1.6 Installing repair kit for headlight housing
  157
• 1.7 Converting headlights from driving on right to driving on left
  159
• 1.8 Converting headlights from driving on left to driving on right
  159
• 1.9 Removing and installing headlight range control motor V48/V49
  160
• 1.10 Removing and installing dipped-beam headlight bulb
  166
• 1.11 Removing and installing headlight main beam bulb M30/M32
  173
• 1.12 Removing and installing daytime running light
  174
• 1.14 Removing and installing side light bulb M1/M3
  177
• 1.15 Removing and installing output module for headlight J667/J668
  177
• 1.16 Removing and installing output module 1 for LED headlight A31/A27
  178
• 1.17 Removing and installing control motor sender for VARILIS headlight G695/G696
  180
• 1.18 Removing and installing control motor for VARILIS headlight V446/V447
  180
• 2 Fog lights
  181
• 2.1 Assembly overview - fog lights
  181
• 2.2 Removing and installing fog light
  182
• 2.3 Removing and installing fog light bulb L22/L23
  184
• 3 Lights in exterior mirror
  186
• 3.1 Assembly overview - lights in exterior mirror
  186
• 3.2 Removing and installing turn signal
  188
• 3.3 Removing and installing entry light in exterior mirror
  189
• 4 Tail lights
  191
• 4.1 Assembly overview - tail lights in body
  191
• 4.2 Assembly overview - tail lights in rear lid
  191
• 4.3 Removing and installing tail light in rear lid
  192
• 4.4 Adjusting installation position of tail light
  194
• 4.5 Removing and installing tail light cluster
  195
• 5 High-level brake light
  196
• 5.1 Assembly overview – high-level brake light
  196
• 5.2 Removing and installing high-level brake light
  197
• 6 Number plate light
  201
• 6.1 Removing and installing number plate light X4/X5
  201
• 6.2 Removing and installing bulb for number plate light X4/X5
  202
• 7 Entry and start authorisation system
  203
• 7.1 Overview of fitting locations - entry and start authorisation system
  203
• 7.2 Overview of fitting locations - keyless entry system
  205
• 7.3 Removing and installing interface for entry and start system J965
  209
• 7.4 Removing and installing door exterior handle contact sensor G415/G416
  210
• 7.5 Removing and installing interior aerial 1 for entry and start authorisation R138
  211
• 7.6 Removing and installing driver side aerial for entry and start system R134
  211
• 7.9 Removing and installing rear bumper aerial for entry and start system R136
  213
• 8 Steering column switch module
  214
• 8.1 Assembly overview - steering column switch module
  214
• 8.2 Removing and installing lock cylinder
  216
• 8.3 Removing and installing ignition key withdrawal lock solenoid N376
  219
• 8.4 Removing and installing ignition/starter switch
  219
• 8.5 Removing and installing steering column switch module
  221
• 8.6 Removing and installing steering column electronics control unit J527
  226
• 8.7 Removing and installing turn signal switch E2
  232
• 8.8 Removing and installing cruise control system switch E45
  234
• 8.9 Removing and installing intermittent wiper switch E22
  234
• 8.10 Removing and installing immobiliser reader coil D2
  234
• 8.11 Removing and installing steering lock housing
  235
• 9 Parking aid
  237
• 9.1 Assembly overview – parking aid
  237
• 9.2 Removing and installing parking aid control unit J446
  241
• 9.3 Removing and installing front parking aid warning buzzer H22
  243
• 9.4 Removing and installing rear parking aid warning buzzer H15
  244
• 9.5 Removing and installing front parking aid senders
  245
• 9.6 Removing and installing rear parking aid senders
  247
• 10 Park assist steering
  250
• 10.1 Assembly overview - park assist steering
  250
• 10.2 Removing and installing control unit
  251
• 10.3 Removing and installing front senders
  251
• 10.4 Removing and installing rear senders
  252
• 11 Automatic headlight range control
  254
• 11.1 Assembly overview - automatic headlight range control
  254
• 11.2 Removing and installing cornering light and headlight range control unit J745
  255
• 12 Towing bracket
  258
• 12.1 Assembly overview - towing bracket socket
  258
• 12.2 Trailer socket U10
  258
• 12.3 Removing and installing trailer detector control unit J345
  259
• 13 Blind Spot Monitor
  260
• 13.1 Assembly overview - Blind Spot Monitor
  260
• 13.2 Removing and installing warning lamp for Blind Spot Monitor K303/K304
  261
• 13.3 Removing and installing Blind Spot Monitor control unit J1086/J1087
  261
• 13.4 Calibrating Blind Spot Monitor
  262
• Lights, bulbs, switches - interior
  271
• 1 Lights
  271
• 1.1 Overview of fitting locations - lights in dash panel
  271
• 1.2 Overview of fitting locations - lights in front doors
  272
• 1.3 Overview of fitting locations - lights in rear doors
  273
• 1.4 Overview of fitting locations - lights in centre console
  274
• 1.5 Overview of fitting locations - lights in luggage compartment
  275
• 1.6 Overview of fitting locations - lights in roof trim
  276
• 1.7 Removing and installing glove compartment light W6
  277
• 1.8 Replacing bulb for glove compartment light W6
  278
• 1.9 Removing and installing front footwell light K268/K269
  279
• 1.10 Removing and installing front footwell illumination bulb L151/L152
  280
• 1.11 Removing and installing Central locking SAFELOCK function warning lamp K133
  281
• 1.12 Removing and installing reflectors in door
  282
• 1.13 Removing and installing entry light W92/W93
  283
• 1.14 Removing and installing light for interior door handle illumination L219/L220
  283
• 1.15 Removing and installing light for door ambient lighting W86/W87
  285
• 1.16 Removing and installing light 2 for door background lighting W97/W98
  285
• 1.17 Removing and installing selector lever position display Y26
  286
• 1.18 Removing and installing luggage compartment light W3
  286
• 1.19 Removing and installing illuminated vanity mirror W20/W14
  288
• 1.20 Removing and installing bulb for front interior light W1
  289
• 1.21 Removing and installing bulb for rear interior light W43
  291
• 1.22 Removing and installing bulb for rear reading light W11/W12
  293
• 1.23 Removing and installing LED for ambient lighting
  293
• 2 Controls
  295
• 2.1 Overview of fitting locations - controls in dash panel
  296
• 2.2 Overview of fitting locations - controls in front doors
  298
• 2.3 Overview of fitting locations - controls in rear doors
  298
• 2.4 Overview of fitting locations - controls in centre console
  299
• 2.5 Overview of fitting locations - controls in luggage compartment
  300
• 2.6 Overview of fitting locations - controls in roof trim
  301
• 2.7 Removing and installing rotary light switch EX1
  303
• 2.8 Removing and installing headlight range control regulator E102
  304
• 2.9 Removing and installing driving mode selection button E735
  304
• 2.10 Removing and installing Start/Stop operation button E693
  305
• 2.11 Removing and installing TCS and ESP button E256
  305
• 2.12 Removing and installing parking aid button E266
  305
• 2.13 Removing and installing park assist steering button E581
  305
• 2.14 Removing and installing switch module in centre console EX23/EX30
  305
• 2.15 Removing and installing hazard warning light switch EX3
  307
• 2.16 Removing and installing buttons for seat heating E653/E654
  308
• 2.17 Removing and installing glove compartment light switch E26
  308
• 2.18 Removing and installing exterior mirror adjuster EX11
  310
• 2.19 Removing and installing operating unit for window regulator in driver door E512
  311
• 2.20 Removing and installing front passenger side window regulator button E716
  312
• 2.22 Removing and installing fuel tank flap release button E319
  313
• 2.24 Removing and installing door contact switch F2/F3
  315
• 2.25 Removing and installing rear window regulator switch in door E52/E54
  316
• 2.26 Removing and installing rear door contact switches F10/F11
  316
• 2.28 Removing and installing the starter button E378
  317
• 2.29 Removing and installing rear lid contact switch for anti-theft alarm F123
  318
• 2.30 Removing and installing vanity mirror contact switch F147/F148
  318
• 2.31 Removing and installing sunroof button E325
  318
• 2.32 Removing and installing front interior light/reading light
  319
• 2.33 Removing and installing rear interior light/reading light
  321
• 2.34 Removing and installing front right reading light button E634
  322
• 3 Anti-theft alarm
  324
• 3.1 Assembly overview - interior monitor
  324
• 3.2 Removing and installing alarm horn H12
  325
• 3.3 Removing and installing anti-theft alarm sensor G578
  327
• 4 Front camera for driver assist systems
  331
• 4.1 Removing and installing front camera for driver assist systems
  331
• 5 Cigarette lighter, socket
  332
• 5.1 Removing and installing cigarette lighter U1
  332
• 5.2 Removing and installing socket illumination bulb L42
  332
• 5.3 Removing and installing rear cigarette lighter illumination bulb L32
  332
• 5.4 Removing and installing electric socket U
  332
• Wiring
  333
• 1 Relay carriers, fuse holders, electronics boxes
  333
• 1.1 Overview of fitting locations - relay carriers, fuse holders, E-boxes
  333
• 1.2 Removing and installing electronics box (E-box)
  337
• 1.3 Removing and installing relay and fuse holder in electronics box
  339
• 1.4 Removing and installing relay and fuse carrier behind dash panel
  342
• 1.5 Removing and installing fuse holder, battery
  344
• 2 Select Control units
  345
• 2.1 Overview of fitting locations - control units
  345
• 2.2 Assembly overview - onboard supply control unit
  348
• 2.3 Assembly overview - data bus diagnostic interface
  350
• 2.4 Removing and installing onboard supply control unit J519
  351
• 2.5 Removing and installing data bus diagnostic interface J533
  355
• 2.6 Removing and installing bracket for onboard supply control unit J519
  356
• 2.7 Renewing bracket for onboard supply control unit J519
  358
• 3 Connectors
  361
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  361
• 4 Releasing and dismantling connector housings
  362
• 5 Repairing aerial wires
  363
• 6 Fibre optic cables
  364
• 7 Vehicle diagnosis, testing and information systems
  365