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
• 2 Repair instructions
  2
• 2.1 Rules for cleanliness
  2
• 2.2 General information
  2
• 2.3 Contact corrosion
  2
• 2.4 Routing and attachment of lines
  2
• 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
  6
• 1.3 Disconnecting and connecting battery
  8
• 1.4 Removing and installing battery tray
  9
• 1.5 Checking battery
  10
• 1.6 Charging battery
  10
• 1.7 Removing and installing earth wire with battery monitor control unit J367
  10
• 1.8 Adapting battery monitor control unit J367
  11
• 2 Alternator
  12
• 2.1 Assembly overview - alternator
  12
• 2.2 Removing and installing alternator
  13
• 2.3 Checking alternator
  15
• 2.4 Removing and installing poly V-belt pulley
  16
• 2.5 Removing and installing voltage regulator
  23
• 3 Starter motor
  26
• 3.1 Assembly overview – starter
  26
• 3.2 Removing and installing starter
  27
• 3.3 Checking starter
  30
• 4 Cruise control system (CCS)
  31
• 5 Adaptive cruise control
  32
• Gauges, instruments
  33
• 1 Dash panel insert
  33
• 1.1 Assembly overview - dash panel insert
  33
• 1.2 Removing and installing dash panel insert KX2
  34
• 2 Horn
  38
• 2.1 Assembly overview - horn
  38
• 2.2 Removing and installing treble horn H2 and bass horn H7
  38
• Windscreen wash/wipe system
  40
• 1 windscreen wiper system
  40
• 1.1 Assembly overview - windscreen wiper system
  40
• 1.2 Moving wipers to service position
  41
• 1.3 Removing and installing wiper blade
  42
• 1.4 Removing and installing wiper arms
  42
• 1.5 Adjusting wiper arms
  44
• 1.6 Removing and installing wiper motor V
  45
• 1.7 Deactivating APP function of wiper motor
  46
• 1.8 Removing and installing rain and light sensor
  47
• 2 Windscreen washer system
  51
• 2.1 Assembly overview - windscreen washer system
  51
• 2.2 Removing and installing washer fluid reservoir
  52
• 2.3 Removing and installing windscreen washer fluid level sender
  53
• 2.4 Removing and installing windscreen washer pump
  53
• 2.5 Removing and installing washer jets
  54
• 2.6 Adjusting spray jets
  55
• 3 Rear window wiper system
  56
• 3.1 Assembly overview - rear window wiper system
  56
• 3.2 Removing and installing wiper blade
  57
• 3.3 Removing and installing wiper arm
  57
• 3.4 Adjusting wiper arm
  58
• 3.5 Removing and installing rear window wiper motor V12
  59
• 4 Rear window washer system
  61
• 4.1 Assembly overview - rear window washer system
  61
• 4.2 Removing and installing washer fluid reservoir
  62
• 4.3 Removing and installing rear window washer pump
  62
• 4.4 Removing and installing spray jet
  62
• 4.5 Adjusting spray jet
  62
• 5 Washer fluid lines
  64
• 5.1 Repairing washer fluid lines
  64
• Lights, bulbs, switches - exterior
  65
• 1 Headlights
  65
• 1.1 Assembly overview - headlight
  65
• 1.2 Removing and installing headlight
  69
• 1.3 Adjusting headlights
  71
• 1.4 Adjusting headlight installation position
  72
• 1.5 Removing and installing front turn signal bulb M5 / M7
  74
• 1.6 Installing repair kit for headlight housing
  75
• 1.7 Converting headlights from driving on right to driving on left
  77
• 1.8 Converting headlights from driving on left to driving on right
  77
• 1.9 Removing and installing headlight range control motor V48 / V49
  78
• 1.10 Removing and installing dipped beam bulb
  82
• 1.11 Removing and installing headlight main beam bulb M30 / M32
  85
• 1.12 Removing and installing daytime running light
  86
• 1.13 Removing and installing LED modules for daytime running light and side light L176 / L177
  87
• 1.14 Removing and installing bulbs for cornering light L148 / L149
  88
• 1.15 Removing and installing output module 1 for LED headlight A31 / A27
  88
• 2 Fog lights
  90
• 2.1 Assembly overview - fog lights
  90
• 2.2 Removing and installing fog light
  90
• 2.3 Removing and installing fog light bulb L22 / L23
  90
• 2.4 Adjusting fog lights
  91
• 3 Lights in exterior mirror
  92
• 3.1 Assembly overview - lights in exterior mirror
  92
• 3.2 Removing and installing turn signal
  93
• 4 Tail lights
  94
• 4.1 Assembly overview - tail lights in body
  94
• 4.2 Removing and installing bulb carrier
  95
• 4.3 Removing and installing tail light cluster
  95
• 4.4 Adjusting installation position of tail light
  96
• 4.5 Removing and installing tail light bulb M2 / M4
  97
• 4.6 Removing and installing rear fog light
  97
• 4.7 Removing and installing rear fog light bulb L46 / L47
  98
• 4.8 Removing and installing brake and tail light bulb M21 / M22
  98
• 4.9 Removing and installing reversing light bulb
  98
• 4.10 Removing and installing turn signal bulb
  99
• 5 High-level brake light
  100
• 5.1 Assembly overview - high-level brake light
  100
• 5.2 Removing and installing high-level brake light
  100
• 6 Number plate light
  102
• 6.1 Removing and installing number plate light X4 / X5
  102
• 6.2 Removing and installing bulb for number plate light X4 / X5
  102
• 7 Entry and start authorisation system
  103
• 7.1 Overview of fitting locations - entry and start authorisation system
  103
• 7.2 Overview of fitting locations - keyless entry system
  105
• 7.3 Removing and installing entry and start authorisation control unit J518
  105
• 7.5 Removing and installing interior aerial 1 for entry and start system R138
  106
• 7.6 Removing and installing interior aerial 2 for entry and start system R139
  107
• 7.7 Removing and installing left entry and start authorisation aerial R200
  108
• 7.8 Removing and installing right entry and start authorisation aerial R201
  108
• 7.9 Removing and installing rear bumper aerial for entry and start system R136
  108
• 8 Steering column switch module
  110
• 8.1 Assembly overview - steering column switch module
  110
• 8.2 Removing and installing lock cylinder
  113
• 8.3 Removing and installing ignition key withdrawal lock solenoid N376
  115
• 8.4 Removing and installing ignition/starter switch
  115
• 8.5 Removing and installing steering column switch module
  116
• 8.6 Removing and installing steering column electronics control unit J527
  118
• 8.7 Removing and installing turn signal switch E2
  119
• 8.8 Removing and installing cruise control system switch E45
  120
• 8.9 Removing and installing intermittent wiper switch E22
  121
• 8.10 Removing and installing base for steering column combination switch
  121
• 8.11 Removing and installing steering lock housing
  121
• 9 Parking aid
  124
• 10 Park assist steering
  125
• 11 Automatic headlight range control
  126
• 11.1 Assembly overview - automatic headlight range control
  126
• 11.2 Removing and installing headlight range control unit
  127
• 12 Blind Spot Monitor
  128
• Lights, bulbs, switches - interior
  129
• 1 Lights
  130
• 1.1 Overview of fitting locations - lights in dash panel
  130
• 1.2 Overview of fitting locations - lights in front doors
  132
• 1.3 Overview of fitting locations - lights in centre console
  133
• 1.4 Overview of fitting locations - lights in luggage compartment
  134
• 1.5 Overview of fitting locations - lights in roof trim
  135
• 1.6 Removing and installing glove compartment light W6
  136
• 1.7 Replacing bulb for glove compartment light W6
  137
• 1.8 Removing and installing front footwell light K268 / K269
  138
• 1.9 Removing and installing front footwell illumination bulb L151 / L152
  138
• 1.10 Removing and installing Central locking SAFELOCK function warning lamp K133
  139
• 1.11 Removing and installing storage compartment illumination bulb L120
  139
• 1.12 Removing and installing interior door handle illumination bulb L146 / L147
  140
• 1.13 Removing and installing light for left dashboard ambient lighting L229
  141
• 1.14 Removing and installing light for right dashboard ambient lighting L230
  141
• 1.15 Removing and installing light for centre dashboard ambient lighting L231
  142
• 1.16 Removing and installing selector lever position display Y26
  142
• 1.17 Removing and installing luggage compartment light W3
  142
• 1.18 Removing and installing bulb for luggage compartment light W3
  143
• 1.19 Renewing front interior light bulb W1 / W13 / W19
  143
• 1.20 Renewing bulb for rear interior light W43
  146
• 1.21 Removing and installing bulb for rear reading light W11 / W12
  147
• 2 Controls
  149
• 2.1 Overview of fitting locations - controls in dash panel
  150
• 2.2 Overview of fitting locations - controls in front doors
  151
• 2.3 Overview of fitting locations - controls in rear doors
  152
• 2.4 Overview of fitting locations - controls in centre console
  153
• 2.5 Overview of fitting locations - controls in luggage compartment
  154
• 2.6 Overview of fitting locations - controls in roof trim
  155
• 2.7 Removing and installing rotary light switch EX1
  156
• 2.8 Removing and installing headlight range control regulator E102
  157
• 2.9 Removing and installing parking aid button E266
  158
• 2.10 Removing and installing park assist steering button E581
  158
• 2.11 Removing and installing Start/Stop operation button E693
  158
• 2.12 Removing and installing button for Charisma E735
  158
• 2.14 Removing and installing switch module in centre console
  159
• 2.15 Removing and installing hazard warning light switch EX3
  159
• 2.16 Removing and installing buttons for seat heating E653 / E654
  160
• 2.17 Removing and installing glove compartment light switch E26
  160
• 2.18 Removing and installing exterior mirror adjuster EX11
  161
• 2.19 Removing and installing operating unit for window regulator in driver door E512
  161
• 2.20 Removing and installing window regulator switch in front passenger door EX27
  162
• 2.21 Removing and installing driver side interior locking button for central locking system E308
  162
• 2.22 Removing and installing door contact switch F2 / F3
  163
• 2.23 Removing and installing rear window regulator switch in door E52 / E54
  163
• 2.24 Removing and installing rear door contact switches F10 / F11
  164
• 2.25 Removing and installing the starter button E378
  164
• 2.26 Removing and installing rear lid contact switch
  164
• 2.27 Removing and installing front interior light/reading light
  165
• 2.28 Removing and installing rear interior light/reading light
  167
• 3 Anti-theft alarm
  169
• 3.1 Assembly overview - interior monitor
  169
• 3.2 Removing and installing anti-theft alarm H8
  169
• 3.3 Removing and installing anti-theft alarm sensor G578
  170
• 4 Immobiliser
  172
• 4.1 Removing and installing immobiliser control unit
  172
• 4.2 Removing and installing immobiliser reader coil
  172
• 5 Towing bracket
  174
• 5.1 Assembly overview - socket, trailer detector control unit
  174
• 5.2 Trailer socket
  174
• 5.3 Removing and installing trailer detector control unit J345
  175
• 6 Cigarette lighter, socket
  176
• 6.1 Removing and installing cigarette lighter U1
  176
• 6.2 Removing and installing socket illumination bulb L42
  176
• 6.3 Removing and installing rear cigarette lighter illumination bulb L32
  176
• 6.4 Removing and installing electric socket U
  176
• Wiring
  177
• 1 Relay carriers, fuse holders, electronics boxes
  177
• 1.1 Overview of fitting locations - relay carriers, fuse holders, E-boxes
  177
• 1.2 Assembly overview - fuse holder A SA
  180
• 1.3 Removing and installing electronics box (E-box)
  181
• 1.4 Removing and installing relay and fuse holder in electronics box
  182
• 1.5 Removing and installing relay and fuse holder behind dash panel on driver side
  184
• 1.6 Removing and installing fuse holder A SA
  186
• 2 Control units
  189
• 2.1 Overview of fitting locations - control units
  189
• 2.2 Removing and installing onboard supply control unit J519
  190
• 2.3 Removing and installing data bus diagnostic interface J533
  191
• 2.4 Removing and installing bracket for onboard supply control unit J519
  192
• 3 Connectors
  193
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  193
• 4 Releasing and dismantling connector housings
  194
• 5 Repairing aerial wires
  195
• 6 Fibre optic cables
  196
• 7 Vehicle diagnosis, testing and information systems
  197