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
• 1.2 Safety precautions when using test and measuring instruments during a road test
  1
• 2 Repair notes
  2
• 2.1 Contact corrosion
  2
• 2.2 Routing and attachment of lines
  2
• 3 Battery
  3
• 3.1 Battery - general notes
  3
• 3.2 Types of battery
  3
• Starter, current supply, CCS
  4
• 1 Battery
  4
• 1.1 Assembly overview - battery
  4
• 1.2 Removing and installing battery
  9
• 1.3 Disconnecting and connecting battery
  14
• 1.4 Removing and installing battery tray
  16
• 1.6 Checking battery
  18
• 1.7 Charging battery
  18
• 1.8 Removing and installing earth wire with battery monitor control unit J367
  18
• 1.9 Adapting battery monitor control unit J367
  19
• 2 Alternator
  21
• 2.1 Assembly overview - alternator
  21
• 2.2 Removing and installing alternator
  23
• 2.3 Checking alternator
  34
• 2.4 Removing and installing poly V-belt pulley
  34
• 2.5 Removing and installing voltage regulator
  43
• 3 Starter motor
  47
• 3.1 Assembly overview – starter
  47
• 3.2 Removing and installing starter
  49
• 4 Cruise control system (CCS)
  57
• 5 Start/stop system
  58
• 5.1 General description - start/stop system
  58
• 5.2 Overview of fitting locations - start/stop system
  58
• 6 Adaptive cruise control
  60
• 6.1 Overview of fitting locations - adaptive cruise control
  60
• 6.2 Removing and installing automatic distance control unit
  60
• 6.3 Calibrating adaptive cruise control
  61
• Gauges, instruments
  63
• 1 Dash panel insert
  63
• 1.1 Assembly overview - dash panel insert
  63
• 1.2 Removing and installing dash panel insert KX2
  66
• 2 Horn
  71
• 2.1 Assembly overview - horn
  71
• 2.2 Removing and installing treble horn H2 and bass horn H7
  71
• Windscreen wash/wipe system
  74
• 1 Windscreen wiper system
  74
• 1.1 Assembly overview - windscreen wiper system
  74
• 1.2 Moving wipers to service position
  76
• 1.3 Removing and installing wiper blade
  76
• 1.4 Removing and installing wiper arms
  78
• 1.5 Adjusting wiper arms
  80
• 1.6 Removing and installing wiper motor V
  82
• 1.7 Deactivating APP function of wiper motor
  83
• 1.8 Removing and installing rain and light sensor
  84
• 2 Windscreen washer system
  88
• 2.1 Assembly overview - windscreen washer system
  88
• 2.2 Removing and installing washer fluid reservoir
  94
• 2.3 Removing and installing windscreen washer fluid level sender
  99
• 2.4 Removing and installing windscreen washer pump
  101
• 2.5 Removing and installing spray jets
  103
• 2.6 Adjusting spray jets
  104
• 3 Rear window wiper system
  105
• 3.1 Assembly overview - rear window wiper system
  105
• 3.2 Removing and installing wiper blade
  105
• 3.3 Removing and installing wiper arm
  106
• 3.4 Adjusting wiper arm
  107
• 3.5 Removing and installing rear window wiper motor V12
  108
• 4 Rear window washer system
  110
• 4.1 Assembly overview - rear window washer system
  110
• 4.2 Removing and installing washer fluid reservoir
  111
• 4.3 Removing and installing rear window washer pump
  111
• 4.4 Removing and installing spray jet
  112
• 4.5 Adjusting spray jet
  112
• 5 Headlight washer system
  113
• 5.1 Assembly overview - headlight washer system
  113
• 5.2 Removing and installing washer fluid reservoir
  115
• 5.3 Removing and installing headlight washer system pump V11
  115
• 5.4 Removing and installing pop-up cylinder
  117
• 5.5 Adjusting spray jets
  121
• 6 Washer fluid lines
  122
• 6.1 Repairing washer fluid lines
  122
• Lights, bulbs, switches - exterior
  123
• 1 Headlights
  123
• 1.1 Assembly overview - headlight
  123
• 1.2 Removing and installing headlight
  130
• 1.3 Adjusting headlights
  134
• 1.4 Adjusting headlight installation position
  134
• 1.5 Removing and installing front turn signal bulb M5/M7
  137
• 1.6 Installing repair kit for headlight housing
  138
• 1.7 Converting headlights from driving on right to driving on left
  140
• 1.8 Converting headlights from driving on left to driving on right
  140
• 1.9 Removing and installing headlight range control motor V48/V49
  141
• 1.10 Removing and installing dipped-beam headlight bulb
  147
• 1.11 Removing and installing headlight main beam bulb M30/M32
  154
• 1.13 Removing and installing side light bulb M1/M3
  156
• 1.14 Removing and installing output module for headlight J667/J668
  156
• 1.15 Removing and installing output module 1 for LED headlight A31/A27
  157
• 1.16 Removing and installing control motor sender for VARILIS headlight G695/G696
  158
• 1.17 Removing and installing control motor for VARILIS headlight V446/V447
  159
• 2 Fog lights
  160
• 2.1 Assembly overview - fog lights
  160
• 2.2 Removing and installing fog light
  161
• 2.3 Removing and installing fog light bulb L22/L23
  163
• 3 Lights in exterior mirror
  165
• 3.1 Assembly overview - lights in exterior mirror
  165
• 3.2 Removing and installing turn signal
  167
• 3.3 Removing and installing entry light in exterior mirror
  168
• 4 Tail lights
  171
• 4.1 Assembly overview - tail lights in body
  171
• 4.2 Assembly overview - tail lights in rear lid
  171
• 4.3 Removing and installing tail light in rear lid
  172
• 4.4 Adjusting installation position of tail light
  174
• 4.5 Removing and installing tail light cluster
  175
• 5 High-level brake light
  176
• 5.1 Assembly overview – high-level brake light
  176
• 5.2 Removing and installing high-level brake light
  176
• 6 Number plate light
  179
• 6.1 Removing and installing number plate light X4/X5
  179
• 6.2 Removing and installing bulb for number plate light X4/X5
  180
• 7 Entry and start authorisation system
  181
• 7.1 Overview of fitting locations - entry and start authorisation system
  181
• 7.2 Overview of fitting locations - keyless entry system
  183
• 7.3 Removing and installing interface for entry and start system J965
  187
• 7.4 Removing and installing door exterior handle contact sensor G415/G416
  188
• 7.5 Removing and installing interior aerial 1 for entry and start authorisation R138
  189
• 7.6 Removing and installing driver side aerial for entry and start system R134
  189
• 7.9 Removing and installing rear bumper aerial for entry and start system R136
  191
• 8 Steering column switch module
  192
• 8.1 Assembly overview - steering column switch module
  192
• 8.2 Removing and installing lock cylinder
  194
• 8.3 Removing and installing ignition key withdrawal lock solenoid N376
  197
• 8.4 Removing and installing ignition/starter switch
  197
• 8.5 Removing and installing steering column switch module
  199
• 8.6 Removing and installing steering column electronics control unit J527
  204
• 8.7 Removing and installing turn signal switch E2
  210
• 8.8 Removing and installing cruise control system switch E45
  212
• 8.9 Removing and installing intermittent wiper switch E22
  212
• 8.10 Removing and installing immobiliser reader coil D2
  212
• 8.11 Removing and installing steering lock housing
  213
• 9 Parking aid
  215
• 9.1 Assembly overview – parking aid
  215
• 9.2 Removing and installing parking aid control unit J446
  219
• 9.3 Removing and installing front parking aid warning buzzer H22
  221
• 9.4 Removing and installing rear parking aid warning buzzer H15
  222
• 9.5 Removing and installing front parking aid senders
  223
• 9.6 Removing and installing rear parking aid senders
  224
• 10 Park assist steering
  227
• 10.1 Assembly overview - park assist steering
  227
• 10.2 Removing and installing control unit
  228
• 10.3 Removing and installing front senders
  228
• 10.4 Removing and installing rear senders
  229
• 11 Automatic headlight range control
  231
• 11.1 Assembly overview - automatic headlight range control
  231
• 11.2 Removing and installing cornering light and headlight range control unit J745
  233
• 12 Towing bracket
  236
• 12.1 Assembly overview - towing bracket socket
  236
• 12.2 Trailer socket U10
  236
• 12.3 Removing and installing trailer detector control unit J345
  237
• 13 Blind Spot Monitor
  239
• 13.1 Assembly overview - Blind Spot Monitor
  239
• 13.2 Removing and installing warning lamp for Blind Spot Monitor K303/K304
  240
• 13.3 Removing and installing Blind Spot Monitor control unit J1086/J1087
  241
• 13.4 Calibrating Blind Spot Monitor
  241
• Lights, bulbs, switches - interior
  251
• 1 Lights
  251
• 1.1 Overview of fitting locations - lights in dash panel
  251
• 1.2 Overview of fitting locations - lights in front doors
  252
• 1.3 Overview of fitting locations - lights in rear doors
  253
• 1.4 Overview of fitting locations - lights in centre console
  254
• 1.5 Overview of fitting locations - lights in luggage compartment
  255
• 1.6 Overview of fitting locations - lights in roof trim
  256
• 1.7 Removing and installing glove compartment light W6
  258
• 1.8 Replacing bulb for glove compartment light W6
  259
• 1.9 Removing and installing front footwell light K268/K269
  260
• 1.10 Removing and installing front footwell illumination bulb L151/L152
  261
• 1.11 Removing and installing Central locking SAFELOCK function warning lamp K133
  262
• 1.12 Removing and installing reflectors in door
  263
• 1.13 Removing and installing entry light W92/W93
  264
• 1.14 Removing and installing light for interior door handle illumination L219/L220
  264
• 1.15 Removing and installing light for door ambient lighting W86/W87
  265
• 1.16 Removing and installing light 2 for door background lighting W97/W98
  265
• 1.17 Removing and installing selector lever position display Y26
  266
• 1.18 Removing and installing luggage compartment light W3
  267
• 1.19 Removing and installing illuminated vanity mirror W20/W14
  268
• 1.20 Removing and installing bulb for front interior light W1
  269
• 1.21 Removing and installing bulb for rear interior light W43
  271
• 1.22 Removing and installing bulb for rear reading light W11/W12
  273
• 1.23 Renewing bulb of rear interior light W47/W48
  273
• 1.24 Removing and installing LED for ambient lighting
  275
• 2 Controls
  277
• 2.1 Overview of fitting locations - controls in dash panel
  278
• 2.2 Overview of fitting locations - controls in front doors
  279
• 2.3 Overview of fitting locations - controls in rear doors
  280
• 2.4 Overview of fitting locations - controls in centre console
  281
• 2.5 Overview of fitting locations - controls in luggage compartment
  282
• 2.6 Overview of fitting locations - controls in roof trim
  283
• 2.7 Removing and installing rotary light switch EX1
  285
• 2.8 Removing and installing headlight range control regulator E102
  286
• 2.9 Removing and installing driving mode selection button E735
  286
• 2.10 Removing and installing Start/Stop operation button E693
  286
• 2.11 Removing and installing TCS and ESP button E256
  287
• 2.12 Removing and installing parking aid button E266
  287
• 2.13 Removing and installing park assist steering button E581
  287
• 2.14 Removing and installing switch module in centre console EX23/EX30
  287
• 2.15 Removing and installing hazard warning light switch EX3
  289
• 2.16 Removing and installing buttons for seat heating E653/E654
  289
• 2.17 Removing and installing glove compartment light switch E26
  290
• 2.18 Removing and installing exterior mirror adjuster EX11
  291
• 2.19 Removing and installing operating unit for window regulator in driver door E512
  292
• 2.20 Removing and installing front passenger side window regulator button E716
  293
• 2.23 Removing and installing door contact switch F2/F3
  295
• 2.24 Removing and installing rear window regulator button E711/E713
  296
• 2.25 Removing and installing rear door contact switches F10/F11
  296
• 2.27 Removing and installing the starter button E378
  297
• 2.28 Removing and installing rear lid contact switch
  298
• 2.29 Removing and installing vanity mirror contact switch F147/F148
  298
• 2.30 Removing and installing sunroof button E325
  298
• 2.31 Removing and installing front interior light/reading light
  299
• 2.32 Removing and installing rear interior light/reading light
  301
• 2.33 Removing and installing front reading light button E633/E634
  302
• 3 Anti-theft alarm
  304
• 3.1 Assembly overview - interior monitor
  304
• 3.2 Removing and installing alarm horn H12
  305
• 3.3 Removing and installing anti-theft alarm sensor G578
  306
• 4 Front camera for driver assist systems
  311
• 4.1 Removing and installing front camera for driver assist systems
  311
• 5 Cigarette lighter, socket
  312
• 5.1 Assembly overview - DC/AC converter with socket, 12 V-230 V
  312
• 5.2 Removing and installing cigarette lighter U1
  313
• 5.3 Removing and installing socket illumination bulb L42
  313
• 5.4 Removing and installing rear cigarette lighter illumination bulb L32
  313
• 5.5 Removing and installing electric socket U
  313
• 5.6 Removing and installing DC/AC converter with socket, 12 V-230 V U13
  313
• Wiring
  316
• 1 Relay carriers, fuse holders, electronics boxes
  316
• 1.1 Overview of fitting locations - relay carriers, fuse holders, E-boxes
  316
• 1.2 Removing and installing electronics box (E-box)
  319
• 1.3 Removing and installing relay and fuse holder in electronics box
  321
• 1.4 Removing and installing relay and fuse carrier behind dash panel
  324
• 2 Select Control units
  327
• 2.1 Overview of fitting locations - control units
  327
• 2.2 Assembly overview - onboard supply control unit
  329
• 2.3 Assembly overview - data bus diagnostic interface
  331
• 2.4 Removing and installing onboard supply control unit J519
  332
• 2.5 Removing and installing data bus diagnostic interface J533
  336
• 2.6 Removing and installing bracket for onboard supply control unit J519
  337
• 2.7 Renewing bracket for onboard supply control unit J519
  339
• 3 Connectors
  342
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  342
• 4 Releasing and dismantling connector housings
  343
• 5 Repairing aerial wires
  344
• 6 Fibre optic cables
  345
• 7 Vehicle diagnosis, testing and information systems
  346