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
• 1.3 Operation and safety notes for gas discharge lamps
  2
• 2 Repair notes
  4
• 2.1 Contact corrosion
  4
• 2.2 Routing and attachment of lines
  4
• 3 Battery
  5
• 3.1 Types of battery
  5
• 3.2 Battery - general notes
  5
• Starter, current supply, CCS
  6
• 1 Battery
  6
• 1.1 Assembly overview - battery
  6
• 1.2 Assembly overview - battery isolator
  9
• 1.3 Removing and installing battery
  10
• 1.4 Disconnecting and connecting battery
  15
• 1.5 Removing and installing battery tray
  18
• 1.6 Checking battery
  21
• 1.7 Charging battery
  21
• 1.8 Removing and installing earth wire with battery monitor control unit J367
  22
• 1.9 Removing and installing battery isolator
  23
• 1.10 Adapting battery monitor control unit J367
  24
• 2 Jump start point
  25
• 2.1 Assembly overview - jump-start terminal
  25
• 2.2 Removing and installing jump starting point
  25
• 3 Alternator
  27
• 3.1 Assembly overview - alternator
  27
• 3.2 Removing and installing alternator
  30
• 3.3 Checking alternator
  42
• 3.4 Checking poly V-belt
  42
• 3.5 Removing and installing poly V-belt pulley
  42
• 3.6 Removing and installing voltage regulator C1
  50
• 4 Starter motor
  55
• 4.1 Assembly overview – starter
  55
• 4.2 Removing and installing starter
  62
• 4.3 Checking starter
  70
• 5 Cruise control system (CCS)
  71
• 6 Start/stop system
  72
• 6.1 General description - start/stop system
  72
• 7 Adaptive cruise control
  73
• 7.1 Overview of fitting locations - adaptive cruise control
  73
• 7.2 Removing and installing adaptive cruise control unit J428
  74
• 7.3 Removing and installing trim for radar sensor
  77
• 7.4 Calibrating adaptive cruise control
  77
• Gauges, instruments
  79
• 1 Dash panel insert
  79
• 1.1 Assembly overview - dash panel insert
  79
• 1.2 Removing and installing dash panel insert KX2
  79
• 2 Horn
  82
• 2.1 Assembly overview - horn
  82
• 2.2 Removing and installing treble horn H2 and bass horn H7
  83
• Windscreen wash/wipe system
  85
• 1 Windscreen wiper system
  85
• 1.1 Assembly overview - windscreen wiper system
  85
• 1.2 Moving wipers to service position
  86
• 1.3 Removing and installing wiper blade
  87
• 1.4 Removing and installing wiper arms
  88
• 1.5 Adjusting wiper arms
  89
• 1.6 Removing and installing wiper motor V
  90
• 1.7 Renewing wiper motor
  92
• 1.8 Removing and installing rain and light sensor
  94
• 2 Windscreen washer system
  97
• 2.1 Assembly overview - windscreen washer system
  97
• 2.2 Removing and installing washer fluid reservoir
  98
• 2.3 Removing and installing windscreen washer fluid level sender G33
  100
• 2.4 Removing and installing windscreen and rear window washer pump V59
  101
• 2.5 Removing and installing washer jets
  101
• 2.6 Adjusting spray jets
  102
• 3 Rear window wiper system
  103
• 3.1 Assembly overview - rear window wiper system
  103
• 3.2 Removing and installing wiper blade
  104
• 3.3 Removing and installing wiper arm
  104
• 3.4 Adjusting wiper arm
  105
• 3.5 Removing and installing rear window wiper motor V12
  106
• 4 Rear window washer system
  108
• 4.1 Assembly overview - rear window washer system
  108
• 4.2 Removing and installing washer fluid reservoir
  109
• 4.3 Removing and installing rear window washer pump
  109
• 4.4 Removing and installing spray jet
  109
• 4.5 Adjusting spray jet
  110
• 5 Headlight washer system
  111
• 5.1 Assembly overview - headlight washer system
  111
• 5.2 Removing and installing washer fluid reservoir
  112
• 5.3 Removing and installing headlight washer system pump V11
  112
• 5.4 Removing and installing washer jets
  113
• 5.5 Adjusting spray jets
  113
• 5.6 Removing and installing pop-up cylinder
  113
• 6 Washer fluid lines
  116
• 6.1 Repairing washer fluid lines
  116
• Lights, bulbs, switches - exterior
  117
• 1 Headlights
  118
• 1.1 Assembly overview - headlight
  118
• 1.2 Removing and installing headlight
  125
• 1.3 Adjusting headlights
  127
• 1.4 Adjusting headlight installation position
  127
• 1.5 Removing and installing front turn signal bulb M5 / M7
  128
• 1.6 Installing repair kit for headlight housing
  133
• 1.7 Converting headlights from driving on right to driving on left
  134
• 1.8 Converting headlights from driving on left to driving on right
  139
• 1.9 Removing and installing headlight range control motor V48 / V49
  144
• 1.10 Removing and installing headlight dipped beam bulb M29 / M31
  152
• 1.11 Removing and installing headlight main beam bulb M30 / M32
  156
• 1.12 Removing and installing gas discharge bulb L13 / L14
  161
• 1.13 Removing and installing side light bulb M1 / M3
  162
• 1.14 Removing and installing daytime running light bulb L174 / L175
  166
• 1.15 Removing and installing headlight screen adjustment solenoid N395 / N396
  166
• 1.16 Removing and installing bulbs for cornering light M51 / M52
  167
• 1.17 Removing and installing headlight starter for gas discharge light J426 / J427
  168
• 1.18 Removing and installing LED modules for daytime running light and side light L176 / L177
  169
• 1.19 Removing and installing starter unit for gas discharge bulb
  169
• 1.20 Removing and installing output module 1 for LED headlight A27 / A31
  170
• 1.21 Removing and installing control unit for daytime running light and side light J860 / J861
  171
• 2 Fog lights
  172
• 2.1 Assembly overview - fog lights
  172
• 2.2 Removing and installing fog light
  174
• 2.3 Removing and installing fog light bulb L22 / L23
  179
• 2.4 Adjusting fog lights
  180
• 3 Daytime running light
  181
• 3.1 Assembly overview - daytime running lights
  181
• 3.2 Removing and installing daytime running light bulb L174 / L175
  182
• 4 Lights in exterior mirror
  184
• 4.1 Assembly overview - lights in exterior mirror
  184
• 4.2 Removing and installing turn signal
  185
• 4.3 Removing and installing turn signal repeater bulb L131 / L132
  185
• 5 Tail lights
  186
• 5.1 Assembly overview - tail lights in body
  186
• 5.2 Removing and installing bulb carrier
  186
• 5.3 Removing and installing tail light cluster
  187
• 6 High-level brake light
  189
• 6.1 Assembly overview - high-level brake light
  189
• 6.2 Removing and installing high-level brake light
  190
• 6.3 Removing and installing bulb for high-level brake light M25
  192
• 7 Number plate light
  193
• 7.1 Removing and installing number plate light X4 / X5
  193
• 7.2 Removing and installing bulb for number plate light X4 / X5
  194
• 8 Steering column switch module
  195
• 8.1 Assembly overview - steering column switch module
  195
• 8.3 Removing and installing steering column combination switch E595
  198
• 8.4 Removing and installing turn signal switch E2
  200
• 8.5 Removing and installing cruise control system switch E45
  200
• 8.6 Removing and installing intermittent wiper switch E22
  201
• 8.7 Removing and installing ignition/starter switch D
  201
• 8.8 Removing and installing lock cylinder
  202
• 8.9 Removing and installing steering lock housing
  204
• 8.10 Removing and installing ignition key withdrawal lock solenoid N376
  206
• 9 Parking aid
  207
• 9.1 Assembly overview – parking aid
  207
• 9.2 Removing and installing parking aid control unit J446
  208
• 9.3 Removing and installing front parking aid warning buzzer H22
  209
• 9.4 Removing and installing rear parking aid warning buzzer H15
  209
• 9.5 Removing and installing front parking aid senders
  210
• 9.6 Removing and installing rear parking aid senders
  211
• 10 Automatic headlight range control
  213
• 10.1 Assembly overview - automatic headlight range control
  213
• 10.2 Removing and installing headlight range control unit J431
  213
• 11 Towing bracket
  215
• 11.1 Assembly overview - towing bracket socket
  215
• 11.2 Removing and installing trailer detector control unit J345
  215
• Lights, bulbs, switches - interior
  217
• 1 Lights
  217
• 1.1 Overview of fitting locations - lights in dash panel
  217
• 1.2 Overview of fitting locations - lights in front doors
  219
• 1.3 Overview of fitting locations - lights in centre console
  220
• 1.4 Overview of fitting locations - lights in luggage compartment
  221
• 1.5 Overview of fitting locations - lights in roof trim
  222
• 1.6 Removing and installing footwell light W9 / W10
  222
• 1.7 Removing and installing footwell light bulb W9 / W10
  223
• 1.8 Removing and installing Central locking SAFELOCK function warning lamp K133
  224
• 1.9 Removing and installing selector lever position display Y6
  225
• 1.10 Removing and installing right luggage compartment light W35
  225
• 1.11 Removing and installing bulb for right luggage compartment light W35
  226
• 1.12 Removing and installing illuminated vanity mirror W20 / W14
  227
• 1.13 Removing and installing bulb for illuminated vanity mirror W20 / W14
  228
• 1.14 Removing and installing front interior light WX1
  229
• 1.15 Removing and installing bulb for front interior light W13 / W15 / W19
  232
• 1.16 Removing and installing rear interior light WX2
  235
• 1.17 Removing and installing bulb for rear centre reading light W44
  236
• 2 Controls
  239
• 2.1 Overview of fitting locations - controls in dash panel
  240
• 2.2 Overview of fitting locations - controls in front doors
  241
• 2.3 Overview of fitting locations - controls in rear doors
  242
• 2.4 Overview of fitting locations - controls in luggage compartment
  243
• 2.5 Overview of fitting locations - controls in roof trim
  244
• 2.6 Removing and installing rotary light switch EX1
  244
• 2.7 Removing and installing regulator for switch and instrument illumination E20
  245
• 2.8 Removing and installing headlight range control regulator E102
  246
• 2.9 Removing and installing heated seat regulator E94 / E95
  246
• 2.10 Removing and installing TCS and ESP button E256
  247
• 2.11 Removing and installing Start/Stop operation button E693
  247
• 2.12 Heated rear window button E230
  247
• 2.13 Removing and installing hazard warning light button E229
  248
• 2.15 Removing and installing parking aid button E266
  248
• 2.16 Removing and installing driving mode selection button E735
  249
• 2.17 Removing and installing buttons in dash panel
  249
• 2.18 Removing and installing operating unit for window regulator in driver door E512
  251
• 2.19 Removing and installing window regulator switch in front passenger door E107
  252
• 2.20 Removing and installing mirror adjustment switch E43
  252
• 2.21 Removing and installing driver side interior locking button for central locking system E308
  253
• 2.22 Removing and installing door contact switch F2 / F3
  253
• 2.23 Removing and installing rear door contact switches F10 / F11
  254
• 2.24 Removing and installing rear lid contact switch for anti-theft alarm F123
  254
• 2.25 Removing and installing rear window regulator switch in door E52 / E54
  254
• 2.26 Removing and installing vanity mirror contact switch F147 / F148
  255
• 3 Further lights and controls in vehicle interior
  256
• 3.1 Overview of fitting locations - further lights and controls in vehicle interior
  256
• 3.2 Removing and installing sunroof button E325
  256
• 3.3 Removing and installing tyre pressure monitor display button E492
  257
• 4 Anti-theft alarm
  258
• 4.1 Assembly overview - interior monitor
  258
• 4.2 Removing and installing alarm horn H12
  258
• 4.3 Activating and deactivating anti-theft alarm
  260
• 4.4 Removing and installing anti-theft alarm sensor G578
  260
• 5 Immobiliser
  263
• 5.1 Removing and installing immobilizer control unit J362
  263
• 5.2 Removing and installing immobiliser reader coil D2
  263
• 6 Cigarette lighter, socket
  264
• 6.1 Removing and installing cigarette lighter U1
  264
• 6.2 Removing and installing 12 V socket
  264
• Wiring
  265
• 1 Relay carriers, fuse holders, electronics boxes
  265
• 1.1 Overview of fitting locations - relay carriers, fuse holders, E-boxes
  265
• 1.2 Removing and installing electronics box (E-box)
  267
• 1.3 Removing and installing bracket for electronics box
  270
• 1.4 Removing and installing fuse holder C SC
  272
• 1.5 Removing and installing relay and fuse carrier 1 SR1
  274
• 2 Control units
  277
• 2.1 Overview of fitting locations - control units
  277
• 2.2 Removing and installing onboard supply control unit J519
  278
• 2.3 Removing and installing data bus diagnostic interface J533
  279
• 3 Connectors
  280
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  280
• 4 Releasing and dismantling connector housings
  281
• 5 Repairing aerial wires
  282
• 6 Fibre optic cables
  283
• 7 Vehicle diagnosis, testing and information systems
  284
• 8 Driving sound and engine sound
  285
• 8.1 Overview of fitting locations - driving sound and engine sound
  285
• 8.2 Removing and installing engine sound generator control unit J943
  286