Electrical system

Chapter overview

• Technical data
  1
• 1 Safety information
  1
• 1.1 Application notes and safety information for LED headlights
  1
• 1.2 Safety measures for working on vehicles with high-voltage system
  1
• 1.3 Safety precautions when working in the vicinity of high-voltage components
  2
• 1.4 Safety measures when working on vehicles with a start/stop system
  2
• 1.5 Safety precautions when using test and measuring instruments during a road test
  2
• 2 Repair notes
  4
• 2.1 Rules for cleanliness
  4
• 2.2 General information
  4
• 2.3 Contact corrosion
  4
• 2.4 ESD workplace
  4
• 2.5 Routing and attachment of lines
  5
• 3 Battery
  6
• 3.1 Battery - general notes
  6
• 3.2 Types of battery
  6
• Starter, current supply, CCS
  7
• 1 Battery
  7
• 1.1 Assembly overview – battery
  7
• 1.2 Assembly overview - voltage converter (48 V/12 V)
  13
• 1.3 Removing and installing voltage converter (48 V/12 V) A7
  13
• 1.4 Removing and installing battery
  15
• 1.5 Disconnecting and connecting battery
  27
• 1.6 Removing and installing battery tray
  31
• 1.7 Checking battery
  33
• 1.8 Charging battery
  33
• 1.9 Removing and installing earth wire with battery monitor control unit J367
  33
• 1.10 Adapting battery monitor control unit J367
  37
• 2 Alternator
  38
• 2.1 Assembly overview - alternator
  38
• 2.2 Removing and installing alternator
  41
• 2.3 Checking alternator
  47
• 2.4 Removing and installing poly V-belt pulley
  48
• 2.5 Removing and installing voltage regulator
  57
• 3 Starter motor
  61
• 3.1 Assembly overview – starter
  61
• 3.2 Removing and installing starter
  64
• Gauges, instruments
  71
• 1 Dash panel insert
  71
• 1.1 Assembly overview - dash panel insert
  71
• 1.2 Assembly overview - head-up display
  72
• 1.3 Removing and installing dash panel insert KX2
  73
• 1.4 Removing and installing control unit for head-up display
  74
• 2 Horn
  76
• 2.1 Assembly overview - horn
  76
• 2.2 Removing and installing treble horn H2 and bass horn H7
  76
• Windscreen wash/wipe system
  79
• 1 Windscreen wiper system
  79
• 1.1 Assembly overview - windscreen wiper system
  79
• 1.2 Moving wipers to service position
  81
• 1.3 Removing and installing wiper blade
  82
• 1.4 Removing and installing wiper arms
  83
• 1.5 Adjusting wiper arms
  84
• 1.6 Removing and installing wiper motor V
  86
• 1.7 Deactivating APP function of wiper motor
  87
• 1.8 Removing and installing rain and light sensor
  88
• 2 Windscreen washer system
  92
• 2.1 Assembly overview - windscreen washer system
  92
• 2.2 Removing and installing washer fluid reservoir
  94
• 2.3 Removing and installing windscreen washer fluid level sender
  96
• 2.4 Removing and installing windscreen washer pump
  96
• 2.5 Removing and installing spray jets
  97
• 2.6 Adjusting spray jets
  98
• 3 Rear window wiper system
  99
• 3.1 Assembly overview - rear window wiper system
  99
• 3.2 Removing and installing wiper blade
  99
• 3.3 Removing and installing wiper arm
  100
• 3.4 Adjusting wiper arm
  101
• 3.5 Removing and installing rear window wiper motor V12
  102
• 4 Rear window washer system
  104
• 4.1 Assembly overview - rear window washer system
  104
• 4.2 Removing and installing washer fluid reservoir
  105
• 4.3 Removing and installing rear window washer pump
  105
• 4.4 Removing and installing spray jet
  105
• 4.5 Adjusting spray jet
  106
• 5 Washer fluid lines
  107
• 5.1 Repairing washer fluid lines
  107
• Lights, bulbs, switches - exterior
  108
• 1 Headlights
  108
• 1.1 Assembly overview – headlight
  108
• 1.2 Removing and installing headlight
  115
• 1.3 Adjusting headlights
  116
• 1.4 Installing repair kit for headlight housing
  116
• 1.5 Removing and installing headlight range control motor V48/V49
  119
• 1.6 Removing and installing front turn signal bulb
  123
• 1.7 Removing and installing dipped-beam headlight bulb
  125
• 1.10 Removing and installing side light bulb M1/M3
  127
• 1.11 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
  130
• 3 Lights in exterior mirror
  132
• 3.1 Assembly overview - lights in exterior mirror
  132
• 3.2 Removing and installing turn signal
  134
• 3.3 Removing and installing entry light in exterior mirror
  135
• 4 Lights in exterior door handle
  136
• 4.1 Assembly overview – lights in exterior door handle
  136
• 4.2 Removing and installing bulb for exterior door handle lighting
  136
• 5 Tail lights
  138
• 5.1 Assembly overview - tail light cluster in body
  138
• 5.2 Assembly overview - tail lights in rear lid
  138
• 5.3 Removing and installing tail light in rear lid
  139
• 5.4 Removing and installing tail light cluster in body
  141
• 6 High-level brake light
  142
• 6.1 Assembly overview – high-level brake light
  142
• 6.2 Removing and installing high-level brake light
  142
• 7 Number plate light
  144
• 7.1 Removing and installing number plate light X4/X5
  144
• 7.2 Removing and installing bulb for number plate light X4/X5
  145
• 8 Entry and start authorisation system
  146
• 8.1 Removing and installing interface for entry and start system J965
  146
• 8.2 Control unit for break-in protection
  147
• 8.3 Removing and installing door exterior handle contact sensor G605/G606
  148
• 8.4 Removing and installing interior aerial 1 for entry and start authorisation R138
  150
• 8.5 Removing and installing left entry and start authorisation aerial R200
  151
• 8.6 Removing and installing right entry and start authorisation aerial R201
  151
• 9 Steering column switch module
  154
• 9.1 Assembly overview - steering column switch module
  154
• 9.2 Removing and installing steering column switch module
  156
• 9.3 Removing and installing turn signal switch E2
  159
• 9.4 Removing and installing cruise control system switch E45
  160
• 9.5 Removing and installing intermittent wiper switch E22
  160
• 10 Automatic headlight range control
  161
• 10.1 Overview of fitting locations – automatic headlight range control
  161
• 10.2 Removing and installing cornering light and headlight range control unit J745
  162
• 11 Towing bracket
  165
• 11.1 Assembly overview - towing bracket socket
  165
• 11.2 Trailer socket U10
  165
• 11.3 Removing and installing trailer detector control unit J345
  166
• Lights, bulbs, switches - interior
  167
• 1 Lights
  167
• 1.1 Overview of fitting locations - lights in dash panel
  167
• 1.2 Overview of fitting locations - lights in front doors
  168
• 1.3 Overview of fitting locations - lights in rear doors
  169
• 1.4 Overview of fitting locations - lights in centre console
  170
• 1.5 Overview of fitting locations - lights in luggage compartment
  171
• 1.6 Overview of fitting locations - lights in roof trim
  172
• 1.7 Removing and installing glove compartment light W6
  173
• 1.8 Removing and installing front footwell light K268/K269
  174
• 1.9 Removing and installing Central locking SAFELOCK function warning lamp K133
  175
• 1.10 Removing and installing luggage compartment light W3
  176
• 1.11 Removing and installing illuminated vanity mirror W20/W14
  177
• 1.12 Removing and installing front roof module WX3
  178
• 1.13 Removing and installing bulb for rear reading light
  179
• 2 Controls
  180
• 2.1 Overview of fitting locations - controls in dash panel
  180
• 2.2 Overview of fitting locations - controls in front doors
  181
• 2.3 Overview of fitting locations - controls in rear doors
  182
• 2.4 Overview of fitting locations – controls in centre console, manual gearbox
  183
• 2.5 Overview of fitting locations – controls in centre console, automatic gearbox
  184
• 2.6 Overview of fitting locations - controls in luggage compartment
  185
• 2.7 Overview of fitting locations - controls in roof trim
  186
• 2.8 Removing and installing operating unit for lighting EX59
  188
• 2.9 Removing and installing exterior mirror adjuster EX11
  188
• 2.11 Removing and installing glove compartment light switch E26
  190
• 2.12 Removing and installing operating unit for window regulator in driver door E512
  192
• 2.13 Removing and installing front passenger side window regulator button E716
  193
• 2.14 Removing and installing door contact switch F2/F3
  194
• 2.15 Removing and installing window regulator switch in rear door E52/E54
  194
• 2.16 Removing and installing rear door contact switches F10/F11
  195
• 2.17 Removing and installing rear lid contact switch for anti-theft alarm F123
  195
• 2.18 Removing and installing vanity mirror contact switch F147/F148
  195
• 2.19 Removing and installing sunroof button E325
  195
• 2.20 Removing and installing front interior light/reading light
  195
• 2.21 Removing and installing rear interior light/reading light
  196
• 2.22 Removing and installing front right reading light button E634
  196
• 2.23 Removing and installing the starter button E378
  197
• 3 Anti-theft alarm
  200
• 3.1 Assembly overview - interior monitor
  200
• 3.2 Removing and installing alarm horn H12
  200
• 3.3 Removing and installing anti-theft alarm sensor G578
  202
• 4 Cigarette lighter, socket
  204
• 4.1 Removing and installing cigarette lighter U1
  204
• 4.2 Removing and installing socket illumination bulb L42
  204
• 4.3 Removing and installing rear cigarette lighter illumination bulb L32
  204
• 4.4 Removing and installing electric socket U
  204
• Wiring
  205
• 1 Relay carriers, fuse holders, electronics boxes
  205
• 1.1 Overview of fitting locations - relay carriers, fuse holders, E-boxes
  205
• 1.2 Removing and installing electronics box (E-box)
  210
• 1.3 Removing and installing relay and fuse holder
  213
• 1.4 Removing and installing relay and fuse carrier behind dash panel
  216
• 1.5 Removing and installing fuse holder, battery
  218
• 2 Select Control units
  219
• 2.1 Overview of fitting locations - control units
  219
• 2.2 Assembly overview - onboard supply control unit
  222
• 2.3 Assembly overview - data bus diagnostic interface
  224
• 2.4 Removing and installing onboard supply control unit J519
  225
• 2.5 Removing and installing data bus diagnostic interface J533
  229
• 2.6 Removing and installing bracket for onboard supply control unit J519
  230
• 2.7 Renewing bracket for onboard supply control unit J519
  232
• 3 Connectors
  234
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  234
• 4 Releasing and dismantling connector housings
  235
• 5 Repairing aerial wires
  236
• 6 Fibre optic cables
  237
• 7 Vehicle diagnosis, testing and information systems
  238