Electrical system

Chapter overview

• Technical data
  1
• 1 Safety information
  1
• 1.1 Safety measures when working on vehicles with start/stop system
  1
• 2 Repair instructions
  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
  6
• 1.3 Disconnecting and connecting battery
  9
• 1.4 Removing and installing battery tray
  11
• 1.5 Checking battery
  12
• 1.6 Charging battery
  12
• 1.7 Removing and installing earth wire with battery monitor control unit J367
  12
• 1.8 Adapting battery monitor control unit J367
  14
• 2 Alternator
  15
• 2.1 Assembly overview - alternator
  15
• 2.2 Removing and installing alternator
  16
• 2.3 Checking alternator
  24
• 2.4 Removing and installing poly V-belt pulley
  25
• 2.5 Removing and installing voltage regulator
  34
• 3 Starter motor
  38
• 3.1 Assembly overview – starter
  38
• 3.2 Removing and installing starter
  42
• 4 Cruise control system (CCS)
  53
• 5 Start/stop system
  54
• 5.1 General description - start/stop system
  54
• 5.2 Overview of fitting locations - start/stop system
  54
• 6 Adaptive cruise control
  55
• 6.1 Overview of fitting locations - adaptive cruise control
  55
• 6.2 Removing and installing automatic distance control unit
  55
• 6.3 Calibrating adaptive cruise control
  56
• Gauges, instruments
  58
• 1 Dash panel insert
  58
• 1.1 Assembly overview - dash panel insert
  58
• 1.2 Removing and installing dash panel insert KX2
  59
• 2 Horn
  65
• 2.1 Assembly overview - horn
  65
• 2.2 Removing and installing treble horn H2 and bass horn H7
  65
• Windscreen wash/wipe system
  67
• 1 Windscreen wiper system
  67
• 1.1 Assembly overview - windscreen wiper system
  67
• 1.2 Moving wipers to service position
  69
• 1.3 Removing and installing wiper blade
  69
• 1.4 Removing and installing wiper arms
  71
• 1.5 Adjusting wiper arms
  72
• 1.6 Removing and installing wiper motor V
  74
• 1.7 Deactivating APP function of wiper motor
  75
• 1.8 Removing and installing rain and light sensor
  75
• 1.9 Repairing rain and light sensor
  77
• 2 Windscreen washer system
  81
• 2.1 Assembly overview - windscreen washer system
  81
• 2.2 Removing and installing washer fluid reservoir
  84
• 2.3 Removing and installing windscreen washer fluid level sender
  86
• 2.4 Removing and installing windscreen washer pump
  87
• 2.5 Removing and installing spray jets
  88
• 2.6 Adjusting spray jets
  89
• 3 Rear window wiper system
  90
• 3.1 Assembly overview - rear window wiper system
  90
• 3.2 Removing and installing wiper blade
  90
• 3.3 Removing and installing wiper arm
  91
• 3.4 Adjusting wiper arm
  92
• 3.5 Removing and installing rear window wiper motor V12
  93
• 4 Rear window washer system
  95
• 4.1 Assembly overview - rear window washer system
  95
• 4.2 Removing and installing washer fluid reservoir
  97
• 4.3 Removing and installing rear window washer pump
  97
• 4.4 Removing and installing spray jet
  98
• 4.5 Adjusting spray jet
  99
• 5 Headlight washer system
  100
• 5.1 Assembly overview - headlight washer system
  100
• 5.2 Removing and installing washer fluid reservoir
  100
• 5.3 Removing and installing headlight washer system pump V11
  101
• 5.4 Removing and installing pop-up cylinder
  101
• 5.5 Adjusting spray jets
  103
• 6 Washer fluid lines
  104
• 6.1 Repairing washer fluid lines
  104
• Lights, bulbs, switches - exterior
  105
• 1 Headlights
  105
• 1.1 Assembly overview - headlight
  105
• 1.2 Removing and installing headlight
  110
• 1.3 Adjusting headlights
  113
• 1.4 Adjusting headlight installation position
  113
• 1.5 Removing and installing front turn signal bulb M5/M7
  115
• 1.6 Installing repair kit for headlight housing
  116
• 1.7 Removing and installing headlight range control motor V48/V49
  118
• 1.8 Removing and installing dipped-beam headlight bulb
  123
• 1.9 Removing and installing headlight main beam bulb M30/M32
  124
• 1.10 Removing and installing side light bulb M1/M3
  125
• 1.12 Removing and installing bulbs for cornering light L148/L149
  126
• 1.13 Removing and installing output module for headlight J667/J668
  126
• 1.14 Removing and installing output module 1 for LED headlight A31/A27
  127
• 2 Fog lights
  130
• 2.1 Assembly overview - fog lights
  130
• 2.2 Removing and installing fog light
  131
• 2.3 Removing and installing fog light bulb L22/L23
  133
• 2.4 Adjusting fog lights
  134
• 3 Lights in exterior mirror
  135
• 3.1 Assembly overview - lights in exterior mirror
  135
• 3.2 Removing and installing turn signal
  137
• 3.3 Removing and installing entry light in exterior mirror
  138
• 4 Tail lights
  140
• 4.1 Assembly overview - tail light cluster in body
  140
• 4.2 Assembly overview - tail lights in rear lid
  142
• 4.3 Removing and installing tail light in rear lid
  144
• 4.4 Adjusting installation position of tail light
  147
• 4.5 Removing and installing tail light cluster
  148
• 4.6 Removing and installing tail light bulb M2/M4
  150
• 4.7 Removing and installing rear fog light bulb L46/L47
  150
• 4.8 Removing and installing brake and tail light bulb M21/M22
  150
• 4.9 Removing and installing reversing light bulb
  151
• 4.10 Removing and installing turn signal bulb
  151
• 5 High-level brake light
  152
• 5.1 Assembly overview – high-level brake light
  152
• 5.2 Removing and installing high-level brake light
  153
• 6 Number plate light
  157
• 6.1 Removing and installing number plate light X4/X5
  157
• 6.2 Removing and installing bulb for number plate light X4/X5
  158
• 7 Entry and start authorisation system
  160
• 7.1 Overview of fitting locations - entry and start authorisation system
  160
• 7.2 Overview of fitting locations - keyless entry system
  161
• 7.3 Removing and installing interface for entry and start system J965
  164
• 7.4 Removing and installing door exterior handle contact sensor G415/G416
  167
• 7.5 Removing and installing interior aerial 1 for entry and start authorisation R138
  167
• 7.6 Removing and installing driver side aerial for entry and start system R134
  168
• 7.9 Removing and installing rear bumper aerial for entry and start system R136
  170
• 8 Steering column switch module
  172
• 8.1 Assembly overview - steering column switch module
  172
• 8.2 Removing and installing lock cylinder
  174
• 8.3 Removing and installing ignition key withdrawal lock solenoid N376
  176
• 8.4 Removing and installing ignition/starter switch
  177
• 8.5 Removing and installing steering column switch module
  179
• 8.6 Removing and installing steering column electronics control unit J527
  185
• 8.7 Removing and installing turn signal switch E2
  191
• 8.8 Removing and installing cruise control system switch E45
  193
• 8.9 Removing and installing intermittent wiper switch E22
  194
• 8.10 Removing and installing immobiliser reader coil D2
  194
• 8.11 Removing and installing base for steering column combination switch
  195
• 8.12 Removing and installing steering lock housing
  195
• 9 Parking aid
  197
• 9.1 Assembly overview – parking aid
  197
• 9.2 Removing and installing parking aid control unit J446
  200
• 9.3 Removing and installing front parking aid warning buzzer H22
  201
• 9.4 Removing and installing rear parking aid warning buzzer H15
  202
• 9.5 Removing and installing front parking aid senders
  203
• 9.6 Removing and installing rear parking aid senders
  205
• 10 Park assist steering
  207
• 10.1 Assembly overview - park assist steering
  207
• 10.2 Removing and installing control unit
  208
• 10.3 Removing and installing front senders
  208
• 10.4 Removing and installing rear senders
  209
• 11 Automatic headlight range control
  211
• 11.1 Assembly overview - automatic headlight range control
  211
• 11.2 Removing and installing cornering light and headlight range control unit J745
  211
• 12 Towing bracket
  213
• 12.1 Removing and installing trailer detector control unit J345
  213
• 13 Blind Spot Monitor
  215
• 13.1 Assembly overview - Blind Spot Monitor
  215
• 13.2 Removing and installing warning lamp for Blind Spot Monitor K303/K304
  217
• 13.3 Removing and installing Blind Spot Monitor control unit J1086/J1087
  218
• 13.4 Calibrating Blind Spot Monitor
  220
• Lights, bulbs, switches - interior
  229
• 1 Lights
  229
• 1.1 Overview of fitting locations - lights in dash panel
  229
• 1.2 Overview of fitting locations - lights in front doors
  230
• 1.3 Overview of fitting locations - lights in centre console
  231
• 1.4 Overview of fitting locations - lights in luggage compartment
  232
• 1.5 Overview of fitting locations - lights in roof trim
  234
• 1.6 Removing and installing glove compartment light W6
  237
• 1.7 Replacing bulb for glove compartment light W6
  238
• 1.8 Removing and installing front footwell light K268/K269
  239
• 1.9 Removing and installing front footwell illumination bulb L151/L152
  240
• 1.10 Removing and installing Central locking SAFELOCK function warning lamp K133
  241
• 1.11 Removing and installing reflectors in door
  242
• 1.12 Removing and installing entry light W92/W93
  242
• 1.13 Removing and installing light for interior door handle illumination L219/L220
  243
• 1.14 Removing and installing light for door ambient lighting W86/W87
  244
• 1.15 Removing and installing selector lever position display Y26
  244
• 1.16 Removing and installing luggage compartment light W3
  244
• 1.17 Removing and installing bulb for luggage compartment light W3
  246
• 1.18 Removing and installing illuminated vanity mirror W20/W14
  246
• 1.19 Removing and installing bulb for illuminated vanity mirror W20/W14
  247
• 1.20 Removing and installing bulb for front interior light W1
  248
• 1.21 Removing and installing bulb for rear interior light W43
  250
• 1.22 Removing and installing bulb for rear reading light W11/W12
  251
• 1.23 Renewing bulb of rear interior light W47/W48
  252
• 2 Controls
  254
• 2.1 Overview of fitting locations - controls in dash panel
  255
• 2.2 Overview of fitting locations - controls in front doors
  256
• 2.3 Overview of fitting locations - controls in rear doors
  256
• 2.4 Overview of fitting locations - controls in centre console
  257
• 2.5 Overview of fitting locations - controls in luggage compartment
  258
• 2.6 Overview of fitting locations - controls in roof trim
  259
• 2.7 Removing and installing rotary light switch EX1
  263
• 2.8 Removing and installing regulator for switch and instrument illumination E20
  264
• 2.9 Removing and installing TCS and ESP button E256
  265
• 2.10 Removing and installing parking aid button E266
  265
• 2.11 Removing and installing park assist steering button E581
  265
• 2.12 Removing and installing Start/Stop operation button E693
  265
• 2.13 Removing and installing driving mode selection button E735
  265
• 2.14 Removing and installing switch module in centre console EX23/EX30
  266
• 2.15 Removing and installing hazard warning light switch EX3
  267
• 2.16 Removing and installing buttons for seat heating E653/E654
  268
• 2.17 Removing and installing glove compartment light switch E26
  268
• 2.18 Removing and installing exterior mirror adjuster EX11
  270
• 2.19 Removing and installing operating unit for window regulator in driver door E512
  270
• 2.20 Removing and installing front passenger side window regulator button E716
  271
• 2.22 Removing and installing door contact switch F2/F3
  273
• 2.23 Removing and installing rear window regulator button E711/E713
  273
• 2.24 Removing and installing rear door contact switches F10/F11
  273
• 2.25 Removing and installing the starter button E378
  274
• 2.26 Removing and installing rear lid contact switch
  274
• 2.27 Removing and installing vanity mirror contact switch F147/F148
  274
• 2.28 Removing and installing sunroof button E325
  275
• 2.29 Removing and installing front interior light/reading light
  275
• 2.30 Removing and installing rear interior light/reading light
  277
• 2.31 Removing and installing front reading light button E633/E634
  280
• 2.32 Removing and installing button 1 for roof roller blind E584
  280
• 3 Anti-theft alarm
  282
• 3.1 Assembly overview - interior monitor
  282
• 3.2 Removing and installing alarm horn/signal horn for anti-theft alarm system
  284
• 3.3 Removing and installing anti-theft alarm sensor G578
  286
• 4 Front camera for driver assist systems
  288
• 4.1 Removing and installing front camera for driver assist systems
  288
• 5 Cigarette lighter, socket
  289
• 5.1 Assembly overview - DC/AC converter with socket, 12 V-115 V
  289
• 5.2 Removing and installing cigarette lighter U1
  289
• 5.3 Removing and installing socket illumination bulb L42
  290
• 5.4 Removing and installing rear cigarette lighter illumination bulb L32
  290
• 5.5 Removing and installing electric socket U
  290
• 5.6 Removing and installing DC/AC converter with socket, 12 V-115 V U27
  290
• Wiring
  292
• 1 Relay carriers, fuse holders, electronics boxes
  292
• 1.1 Overview of fitting locations - relay carriers, fuse holders, E-boxes
  292
• 1.2 Removing and installing electronics box (E-box)
  294
• 1.3 Removing and installing relay and fuse holder in electronics box
  297
• 1.4 Removing and installing relay and fuse holder behind dash panel on driver side
  299
• 2 Select Control units
  301
• 2.1 Overview of fitting locations - control units
  301
• 2.2 Removing and installing onboard supply control unit J519
  302
• 2.3 Removing and installing data bus diagnostic interface J533
  303
• 2.4 Removing and installing bracket for onboard supply control unit J519
  304
• 2.5 Renewing bracket for onboard supply control unit J519
  305
• 2.6 Removing and installing parking aid control unit J446/park assist steering control unit J791
  306
• 3 Connectors
  307
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  307
• 4 Releasing and dismantling connector housings
  308
• 5 Repairing aerial wires
  309
• 6 Fibre optic cables
  310
• 7 Vehicle diagnosis, testing and information systems
  311