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
  7
• 1.3 Disconnecting and connecting battery
  14
• 1.4 Removing and installing battery tray
  17
• 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
  20
• 2 Alternator
  21
• 2.1 Assembly overview - alternator
  21
• 2.2 Removing and installing alternator
  22
• 2.3 Checking alternator
  26
• 2.4 Removing and installing poly V-belt pulley
  27
• 2.5 Removing and installing voltage regulator
  34
• 3 Starter motor
  37
• 3.1 Assembly overview – starter
  37
• 3.2 Removing and installing starter
  38
• 4 Cruise control system (CCS)
  43
• 5 Start/stop system
  44
• 5.1 General description - start/stop system
  44
• 6 Adaptive cruise control
  45
• 6.1 Overview of fitting locations - adaptive cruise control
  45
• 6.2 Removing and installing automatic distance control unit
  45
• 6.3 Calibrating adaptive cruise control
  46
• Gauges, instruments
  47
• 1 Dash panel insert
  47
• 1.1 Assembly overview - dash panel insert
  47
• 1.2 Assembly overview - head-up display
  50
• 1.3 Removing and installing dash panel insert KX2
  51
• 1.4 Removing and installing control unit for head-up display
  54
• 2 Clock
  56
• 2.1 Removing and installing clock
  56
• 3 Horn
  57
• 3.1 Assembly overview - horn
  57
• 3.2 Removing and installing treble horn H2 and bass horn H7
  57
• Windscreen wash/wipe system
  60
• 1 Windscreen wiper system
  60
• 1.1 Assembly overview - windscreen wiper system
  60
• 1.2 Moving wipers to service position
  62
• 1.3 Removing and installing wiper blade
  62
• 1.4 Removing and installing wiper arms
  63
• 1.5 Adjusting wiper arms
  65
• 1.6 Removing and installing wiper motor V
  66
• 1.7 Deactivating APP function of wiper motor
  67
• 1.8 Removing and installing rain and light sensor
  68
• 1.9 Repairing rain and light sensor
  70
• 2 Windscreen washer system
  73
• 2.1 Assembly overview - windscreen washer system
  73
• 2.2 Removing and installing washer fluid reservoir
  76
• 2.3 Removing and installing windscreen washer fluid level sender
  79
• 2.4 Removing and installing windscreen washer pump
  80
• 2.5 Removing and installing washer jets
  81
• 2.6 Adjusting spray jets
  82
• 3 Headlight washer system
  83
• 3.1 Assembly overview - headlight washer system
  83
• 3.2 Removing and installing washer fluid reservoir
  85
• 3.3 Removing and installing headlight washer system pump V11
  86
• 3.4 Adjusting spray jets
  87
• 3.5 Removing and installing pop-up cylinder
  87
• 3.6 Renewing guide frame for headlight washer system
  89
• 4 Washer fluid lines
  90
• 4.1 Repairing washer fluid lines
  90
• Lights, bulbs, switches - exterior
  91
• 1 Headlights
  91
• 1.1 Assembly overview - headlight
  91
• 1.2 Removing and installing headlight
  96
• 1.3 Adjusting headlights
  97
• 1.4 Adjusting headlight installation position
  97
• 1.5 Removing and installing front turn signal bulb M5 / M7
  99
• 1.6 Installing repair kit for headlight housing
  101
• 1.7 Converting headlights from driving on right to driving on left
  103
• 1.8 Converting headlights from driving on left to driving on right
  103
• 1.9 Removing and installing headlight range control motor V48 / V49
  103
• 1.10 Removing and installing dipped beam bulb
  105
• 1.11 Removing and installing headlight main beam bulb M30 / M32
  105
• 1.12 Removing and installing LED modules for daytime running light and side light L176 / L177
  106
• 1.13 Removing and installing output module 1 for LED headlight A27 / A31
  107
• 1.14 Removing and installing trim cover for LED headlight
  108
• 1.15 Removing and installing retaining frame for LED headlight
  109
• 1.16 Removing and installing trim strip for LED headlight
  110
• 1.17 Removing and installing dynamic cornering light control motor V318 / V319
  111
• 1.18 Removing and installing bulbs for cornering light L148 / L149
  111
• 1.19 Removing and installing output module for headlight J667 / J668
  113
• 2 Lights in exterior mirror
  115
• 2.1 Assembly overview - lights in exterior mirror
  115
• 2.2 Removing and installing turn signal
  116
• 2.3 Removing and installing entry light in exterior mirror
  118
• 3 Tail lights
  119
• 3.1 Assembly overview - tail lights in body
  119
• 3.2 Assembly overview - tail lights in rear lid
  120
• 3.3 Removing and installing tail light in rear lid
  120
• 3.4 Adjusting installation position of tail light
  121
• 3.5 Removing and installing tail light cluster
  122
• 3.6 Removing and installing tail light bulb M2 / M4
  122
• 3.7 Removing and installing rear fog light bulb L46 / L47
  122
• 3.8 Removing and installing brake and tail light bulb M21 / M22
  123
• 3.9 Removing and installing reversing light bulb
  123
• 3.10 Removing and installing turn signal bulb
  123
• 4 High-level brake light
  124
• 4.1 Assembly overview - high-level brake light
  124
• 4.2 Removing and installing high-level brake light
  125
• 5 Number plate light
  127
• 5.1 Removing and installing number plate light X4 / X5
  127
• 5.2 Removing and installing bulb for number plate light X4 / X5
  127
• 6 Entry and start authorisation system
  128
• 6.1 Overview of fitting locations - entry and start authorisation system
  128
• 6.2 Overview of fitting locations - keyless entry system
  131
• 6.3 Removing and installing interface for entry and start system J965
  132
• 6.4 Removing and installing door exterior handle contact sensor G415 / G416
  133
• 6.5 Removing and installing contact sensor for rear exterior door handle G417 / G418
  133
• 6.6 Removing and installing interior aerial 1 for entry and start system R138
  133
• 6.7 Removing and installing interior aerial 2 for entry and start system R139
  134
• 6.8 Removing and installing driver side aerial for entry and start system R134
  135
• 6.12 Removing and installing rear bumper aerial for entry and start system R136
  136
• 6.13 Removing and installing rear lid power opening control unit J938
  136
• 6.14 Removing and installing rear lid power opening sender G750 / G760
  137
• 7 Steering column switch module
  139
• 7.1 Assembly overview - steering column switch module
  139
• 7.2 Removing and installing steering column switch module
  140
• 7.3 Removing and installing steering column electronics control unit J527
  142
• 7.4 Removing and installing base for steering column combination switch
  145
• 7.5 Removing and installing turn signal switch E2
  146
• 7.6 Removing and installing cruise control system switch E45
  148
• 7.7 Removing and installing intermittent wiper switch E22
  148
• 7.8 Removing and installing immobiliser reader coil D2
  148
• 8 Parking aid
  149
• 8.1 Assembly overview – parking aid
  149
• 8.2 Removing and installing parking aid control unit J446
  151
• 8.3 Removing and installing front parking aid warning buzzer H22
  152
• 8.4 Removing and installing rear parking aid warning buzzer H15
  153
• 8.5 Removing and installing front parking aid senders
  153
• 8.6 Removing and installing rear parking aid senders
  154
• 9 Park assist steering
  156
• 9.1 Assembly overview - park assist steering
  156
• 9.2 Removing and installing park assist steering control unit J791
  157
• 9.3 Removing and installing front senders
  157
• 9.4 Removing and installing rear senders
  158
• 10 Automatic headlight range control
  160
• 10.1 Assembly overview - automatic headlight range control
  160
• 11 Towing bracket
  164
• 11.1 Assembly overview - towing bracket socket
  164
• 11.2 Trailer socket U10
  164
• 11.3 Removing and installing trailer detector control unit J345
  165
• Lights, bulbs, switches - interior
  166
• 1 Lights
  167
• 1.1 Overview of fitting locations - lights in dash panel
  168
• 1.2 Overview of fitting locations - lights in front doors
  169
• 1.3 Overview of fitting locations - lights in rear doors
  170
• 1.4 Overview of fitting locations - lights in centre console
  171
• 1.5 Overview of fitting locations - lights in luggage compartment
  172
• 1.6 Overview of fitting locations - lights in roof trim
  173
• 1.7 Removing and installing glove compartment light W6
  173
• 1.8 Replacing bulb for glove compartment light W6
  174
• 1.9 Removing and installing front footwell light K268 / K269
  174
• 1.10 Removing and installing front footwell illumination bulb L151 / L152
  175
• 1.11 Removing and installing Central locking SAFELOCK function warning lamp K133
  175
• 1.12 Removing and installing interior door handle illumination bulb L146 / L147
  176
• 1.13 Removing and installing reflectors in door
  176
• 1.14 Removing and installing front entry light W31 / W32
  177
• 1.15 Removing and installing door warning lamp W30 / W36
  178
• 1.16 Removing and installing rear interior door handle illumination bulb L221 / L222
  178
• 1.17 Removing and installing light for front door ambient lighting W86 / W87
  179
• 1.18 Removing and installing light 1 for rear door ambient lighting L201 / L202
  179
• 1.19 Removing and installing light 2 for front door ambient lighting W97 / W98
  179
• 1.21 Removing and installing lights for dashboard ambient lighting L229 / L230
  180
• 1.22 Removing and installing selector lever position display Y26
  181
• 1.23 Removing and installing luggage compartment light W3 / W115
  181
• 1.24 Removing and installing illuminated vanity mirror W20 / W14
  182
• 1.25 Removing and installing bulb for front interior light W1
  182
• 1.26 Removing and installing bulb for rear interior light W43
  185
• 1.27 Removing and installing bulb for front reading light W13 / W19
  186
• 1.28 Removing and installing bulb for rear reading light W11 / W12
  186
• 2 Controls
  188
• 2.1 Overview of fitting locations - controls in dash panel
  189
• 2.2 Overview of fitting locations - controls in front doors
  191
• 2.3 Overview of fitting locations - controls in rear doors
  192
• 2.4 Overview of fitting locations - controls in centre console
  193
• 2.5 Overview of fitting locations - controls in luggage compartment
  194
• 2.6 Overview of fitting locations - controls in roof trim
  195
• 2.7 Removing and installing rotary light switch EX1
  197
• 2.8 Removing and installing switch for Head-up Display E736
  198
• 2.9 Removing and installing steering wheel heater button E522
  198
• 2.10 Removing and installing driving mode selection button E735
  198
• 2.11 Removing and installing Start/Stop operation button E693
  199
• 2.12 Removing and installing TCS and ESP button E256
  199
• 2.13 Removing and installing parking aid button E266
  199
• 2.14 Removing and installing park assist steering button E581
  199
• 2.15 Removing and installing centre switch module in dash panel EX22
  199
• 2.16 Removing and installing switch module in centre console EX23 / EX30
  199
• 2.17 Removing and installing hazard warning light switch EX3
  201
• 2.18 Removing and installing buttons for seat heating E653 / E654
  201
• 2.19 Removing and installing glove compartment light switch E26
  202
• 2.20 Removing and installing exterior mirror adjuster EX11
  203
• 2.21 Removing and installing operating unit for window regulator in driver door E512
  203
• 2.22 Removing and installing front passenger side window regulator button E716
  204
• 2.23 Removing and installing driver side interior locking button for central locking system E308
  204
• 2.24 Removing and installing rear lid remote release button E233
  205
• 2.26 Removing and installing door contact switch F2 / F3
  206
• 2.27 Removing and installing rear window regulator button E711 / E713
  207
• 2.28 Removing and installing rear door contact switches F10 / F11
  207
• 2.30 Removing and installing the starter button E378
  208
• 2.32 Removing and installing button to close rear lid in luggage compartment E406
  210
• 2.33 Removing and installing rear lid warning buzzer H32
  211
• 2.34 Removing and installing rear lid contact switch
  211
• 2.35 Removing and installing vanity mirror contact switch F147 / F148
  212
• 2.36 Removing and installing sunroof button E325
  212
• 2.37 Removing and installing front interior light/reading light
  212
• 2.38 Removing and installing rear interior light/reading light
  215
• 2.39 Removing and installing front reading light button E633 / E634
  216
• 3 Anti-theft alarm
  217
• 3.1 Assembly overview - interior monitor
  217
• 3.2 Assembly overview - alarm horn
  218
• 3.3 Removing and installing alarm horn H12
  219
• 3.4 Removing and installing alarm horn H12
  219
• 3.5 Removing and installing alarm horn H12 NAR
  220
• 3.6 Removing and installing anti-theft alarm sensor G578
  221
• 4 Lane change assist
  223
• 4.1 Assembly overview - lane change assist
  223
• 4.2 Removing and installing lane change assist warning lamp in exterior mirror K233 / K234
  224
• 4.3 Removing and installing lane change assist control unit J769 / J770
  224
• 4.4 Calibrating lane change assist
  225
• 5 Front camera for assist systems
  232
• 5.1 Removing and installing front camera for driver assist systems
  232
• 6 Cigarette lighter, socket
  233
• 6.1 Assembly overview - DC/AC converter with socket, 12 V-230 V
  233
• 6.2 Removing and installing cigarette lighter U1
  234
• 6.3 Removing and installing socket illumination bulb L42
  234
• 6.4 Removing and installing rear cigarette lighter illumination bulb L32
  234
• 6.5 Removing and installing electric socket U
  234
• 6.6 Removing and installing DC/AC converter with socket, 12 V-230 V U13
  234
• Wiring
  236
• 1 Relay carriers, fuse holders, electronics boxes
  236
• 1.1 Overview of fitting locations - relay carriers, fuse holders, E-boxes
  236
• 1.2 Removing and installing electronics box (E-box)
  240
• 1.3 Removing and installing relay and fuse holder in electronics box
  242
• 1.4 Removing and installing relay and fuse carrier behind dash panel
  244
• 1.5 Removing and installing main fuse carrier
  246
• 2 Control units
  248
• 2.1 Overview of fitting locations - control units
  248
• 2.2 Removing and installing onboard supply control unit J519
  250
• 2.3 Removing and installing data bus diagnostic interface J533
  254
• 2.4 Removing and installing bracket for onboard supply control unit J519
  255
• 2.5 Renewing bracket for onboard supply control unit J519
  257
• 2.6 Removing and installing parking aid control unit J446 / park assist steering control unit J791
  257
• 3 Electrical connectors
  259
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  259
• 4 Releasing and dismantling connector housings
  260
• 5 Repairing aerial wires
  261
• 6 Fibre optic cables
  262
• 7 Vehicle diagnosis, testing and information systems
  263