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 Application notes and safety information for LED headlights
  1
• 1.4 Safety precautions – electrical system
  2
• 2 Repair instructions
  3
• 2.1 Rules for cleanliness
  3
• 2.2 General information
  3
• 2.3 Contact corrosion
  3
• 2.4 ESD workplace
  4
• 2.5 Routing and attachment of lines
  4
• 3 Battery
  5
• 3.1 Battery - general notes
  5
• 3.2 Types of battery
  5
• 4 Hazard classification for high-voltage system
  6
• Starter, current supply, CCS
  7
• 1 Battery
  7
• 1.1 Assembly overview – battery
  7
• 1.2 Assembly overview – battery partition
  8
• 1.3 Checking battery
  9
• 1.4 Charging battery
  9
• 1.5 Disconnecting and connecting battery
  10
• 1.6 Removing and installing battery
  14
• 1.7 Removing and installing battery partition
  19
• 1.8 Removing and installing battery tray
  20
• 1.9 Removing and installing battery isolator
  21
• 1.10 Removing and installing earth wire with battery monitor control unit J367
  22
• 1.11 Adapting battery monitor control unit J367
  24
• 2 Alternator
  25
• 2.1 Assembly overview - alternator
  25
• 2.2 Removing and installing alternator
  26
• 2.3 Checking alternator
  30
• 2.4 Checking poly V-belt
  30
• 2.5 Removing and installing poly V-belt pulley
  31
• 2.6 Removing and installing voltage regulator
  37
• 3 Starter motor
  40
• 3.1 Assembly overview – starter
  40
• 3.2 Checking starter
  41
• 3.3 Removing and installing starter
  41
• 4 Cruise control system (CCS)
  52
• 5 Start/stop system
  53
• 5.1 General description - start/stop system
  53
• 5.2 Overview of fitting locations - start/stop system
  53
• 6 Adaptive cruise control
  55
• Gauges, instruments
  56
• 1 Dash panel insert
  56
• 1.1 Assembly overview - dash panel insert
  56
• 1.3 Removing and installing ambient temperature sensor
  59
• 2 Horn
  60
• 2.1 Assembly overview - horn
  60
• 2.2 Removing and installing horn or dual tone horn H1/bass horn H7
  60
• 3 Tachograph DTCO 4.0
  62
• 3.1 Removing and installing tachograph G24
  62
• 3.2 Removing and installing tachograph sender G75
  64
• 3.3 Removing and installing aerial module for tachograph R393
  72
• Windscreen wash/wipe system
  73
• 1 Windscreen wiper system
  73
• 1.1 Assembly overview - windscreen wiper system
  73
• 1.2 Moving wipers to service position
  74
• 1.3 Removing and installing wiper blade
  75
• 1.4 Removing and installing wiper arms
  76
• 1.5 Adjusting wiper arms
  78
• 1.6 Removing and installing wiper frame with linkage and wiper motor V
  80
• 1.7 Renewing wiper motor
  81
• 1.8 Removing and installing rain and light sensor
  85
• 2 Windscreen washer system
  90
• 2.1 Assembly overview - windscreen washer system
  90
• 2.2 Removing and installing filler pipe for washer fluid reservoir
  91
• 2.3 Removing and installing washer fluid reservoir
  92
• 2.4 Removing and installing windscreen washer fluid level sender
  95
• 2.5 Removing and installing windscreen washer pump
  95
• 2.6 Removing and installing spray jets
  96
• 2.7 Adjusting spray jets
  97
• 3 Rear window wiper system
  99
• 3.1 Assembly overview - rear window wiper system
  99
• 3.2 Removing and installing wiper blade
  101
• 3.3 Removing and installing wiper arm
  103
• 3.4 Adjusting wiper arm
  106
• 3.5 Removing and installing rear window wiper motor V12
  107
• 4 Rear window washer system
  113
• 4.1 Assembly overview - rear window washer system
  113
• 4.2 Removing and installing washer fluid reservoir
  116
• 4.3 Removing and installing rear window washer pump
  116
• 4.4 Removing and installing spray jet
  116
• 4.5 Adjusting spray jet
  118
• 5 Washer fluid lines
  119
• 5.1 Washer fluid line hose couplings
  119
• 5.2 Repairing washer fluid lines
  119
• Lights, bulbs, switches - exterior
  120
• 1 Headlights
  120
• 1.1 Assembly overview – headlight
  120
• 1.2 Removing and installing headlight
  125
• 1.3 Adjusting headlights
  128
• 1.4 Adjusting headlight installation position
  128
• 1.5 Removing and installing front turn signal bulb M5/M7
  129
• 1.6 Removing and installing headlight range control motor V48/V49
  130
• 1.7 Removing and installing headlight dipped beam bulb M29/M31
  136
• 1.8 Removing and installing headlight main beam bulb M30/M32
  140
• 1.9 Removing and installing side light bulb M1/M3
  144
• 1.10 Removing and installing daytime running light bulb L174/L175
  144
• 1.12 Removing and installing output module 1 for LED headlights A27/A31
  146
• 1.13 Removing and installing LED headlight fan
  147
• 2 Fog lights
  150
• 2.1 Assembly overview - fog lights
  150
• 2.2 Removing and installing fog light
  150
• 2.3 Removing and installing fog light bulb L22/L23
  151
• 2.4 Adjusting fog lights
  152
• 3 Turn signal repeater
  153
• 3.1 Removing and installing turn signal repeater
  153
• 3.2 Removing and installing turn signal repeater bulb M18/M19
  154
• 4 Lights in sill panel moulding
  156
• 4.1 Removing and installing entry light
  156
• 5 Tail light clusters
  157
• 5.1 Assembly overview – tail lights
  157
• 5.2 Removing and installing bulb carrier
  160
• 5.3 Removing and installing tail light cluster
  161
• 5.4 Removing and installing tail light bulb M2/M4
  165
• 5.5 Removing and installing rear fog light bulb L46/L47
  168
• 5.6 Removing and installing brake light bulb M9/M10
  169
• 5.7 Removing and installing reversing light bulb M16/M17
  172
• 5.8 Removing and installing turn signal bulb M6/M8
  174
• 6 High-level brake light
  178
• 6.1 Removing and installing high-level brake light
  178
• 7 Number plate light
  182
• 7.1 Removing and installing number plate light X4/X5
  182
• 7.2 Removing and installing bulb for number plate light X4/X5
  184
• 8 Steering column switch module
  187
• 8.1 Assembly overview - steering column switch module
  187
• 8.2 Removing and installing steering column switch module
  188
• 8.3 Removing and installing steering column electronics control unit J527
  191
• 8.4 Removing and installing base for steering column combination switch
  193
• 8.5 Removing and installing turn signal switch E2
  193
• 8.6 Removing and installing cruise control system switch E45
  194
• 8.7 Removing and installing intermittent wiper switch E22
  195
• 8.8 Removing and installing ignition/starter switch
  195
• 8.9 Removing and installing lock cylinder
  196
• 8.10 Removing and installing steering lock housing
  199
• 8.11 Removing and installing ignition key withdrawal lock solenoid N376
  201
• 9 Automatic headlight range control
  202
• 9.1 Assembly overview - automatic headlight range control
  202
• 9.2 Removing and installing headlight range control unit
  202
• 10 Towing bracket
  204
• 10.1 Assembly overview - towing bracket socket
  204
• 10.2 Removing and installing trailer socket
  204
• 10.3 Removing and installing trailer detector control unit J345
  207
• Lights, bulbs, switches - interior
  208
• 1 Lights
  208
• 1.1 Overview of fitting locations - lights in dash panel
  208
• 1.2 Overview of fitting locations - lights in luggage compartment
  209
• 1.3 Overview of fitting locations - lights in roof trim
  210
• 1.4 Removing and installing glove compartment light W6
  211
• 1.5 Removing and installing front left footwell light K268/front right footwell light K269
  213
• 1.6 Removing and installing luggage compartment light W3
  214
• 1.8 Removing and installing surround lighting in rear lid W61/W62
  216
• 1.9 Removing and installing front interior light W1
  217
• 1.10 Removing and installing rear interior light/reading light
  219
• 2 Controls
  224
• 2.1 Overview of fitting locations - controls in dash panel
  226
• 2.2 Overview of fitting locations - controls in front doors
  228
• 2.3 Overview of fitting locations - controls in luggage compartment
  229
• 2.4 Overview of fitting locations - controls in roof trim
  230
• 2.5 Removing and installing rotary light switch EX1
  231
• 2.6 Removing and installing regulator for switch and instrument illumination E20
  233
• 2.7 Removing and installing headlight range control regulator E102
  233
• 2.9 Removing and installing tyre pressure monitor display button E492
  234
• 2.10 Removing and installing centre switch module 4 in dash panel EX49
  235
• 2.11 Removing and installing centre switch module 2 in dash panel EX35
  236
• 2.13 Removing and installing centre switch module in dash panel EX22
  237
• 2.14 Removing and installing centre switch module 3 in dash panel EX48
  237
• 2.15 Removing and installing hazard warning light switch EX3
  238
• 2.16 Removing and installing buttons for seat heating E653/E654
  238
• 2.17 Removing and installing glove compartment light switch E26
  238
• 2.18 Removing and installing exterior mirror adjuster EX11
  239
• 2.19 Removing and installing operating unit for window regulator in driver door E512
  240
• 2.20 Removing and installing window regulator switch in front passenger door E107
  241
• 2.22 Removing and installing rear lid remote release button E233
  241
• 2.23 Removing and installing door contact switch F2/F3
  242
• 2.24 Removing and installing rear door contact switches F10/F11
  242
• 2.25 Removing and installing release button for rear lid lock cylinder F248
  243
• 2.26 Removing and installing rear lid closure button E574
  244
• 2.27 Removing and installing rear lid warning buzzer H32
  244
• 2.28 Removing and installing rear lid contact switch
  245
• 2.29 Removing and installing vanity mirror contact switch F147/F148
  245
• 2.30 Removing and installing button for front reading light button / door opening light
  245
• 2.31 Removing and installing button for rear interior light and reading light
  245
• 2.32 Removing and installing Telematics button module E734
  246
• 3 Anti-theft alarm
  247
• 3.1 Assembly overview - interior monitor
  247
• 3.2 Removing and installing alarm horn H12
  247
• 3.3 Removing and installing interior monitoring sensor G273
  248
• 3.4 Removing and installing interior monitoring sensor 3 G593
  249
• 4 Immobiliser
  251
• 4.1 Removing and installing immobiliser control unit
  251
• 4.2 Removing and installing immobiliser reader coil
  251
• 5 Cigarette lighter, socket
  252
• 5.1 Overview of fitting locations - DC/AC converter with socket, 12 V-230 V
  252
• 5.2 Assembly overview – DC/AC converter with socket, 12 V–230 V U13
  255
• 5.3 Assembly overview – sockets
  257
• 5.4 Removing and installing cigarette lighter U1
  260
• 5.5 Removing and installing socket illumination bulb L42
  260
• 5.6 Removing and installing rear cigarette lighter illumination bulb L32
  260
• 5.7 Removing and installing electric socket U
  260
• 5.8 Removing and installing DC/AC converter with socket, 12 V-230 V U13
  260
• 5.9 Removing and installing interior socket 2, 230 V, 110 V U17
  266
• 5.10 Removing and installing trim frame, front section
  268
• Wiring
  270
• 1 Relay carriers, fuse holders, electronics boxes
  270
• 1.1 Overview of fitting locations - relay carriers, fuse holders, E-boxes
  270
• 1.2 Removing and installing fuse holder D SD
  271
• 1.3 Removing and installing fuse holder A SA
  275
• 1.4 Removing and installing fuse holder K SK
  277
• 1.5 Removing and installing fuse holder H SH
  278
• 1.6 Removing and installing coupling station electronics box
  279
• 1.7 Removing and installing relay carrier and fuse holder in electronics box
  279
• 2 Select Control units
  280
• 2.1 Overview of fitting locations - control units
  280
• 2.2 Removing and installing onboard supply control unit J519
  281
• 2.3 Removing and installing data bus diagnostic interface J533
  281
• 2.4 Removing and installing special vehicle control unit J608
  282
• 2.5 Removing and installing rear lid power opening control unit J938
  283
• 3 Connectors
  285
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  285
• 4 Releasing and dismantling connector housings
  286
• 5 Repairing aerial wires
  287
• 6 Fibre optic cables
  288
• 7 Vehicle diagnosis, testing and information systems
  289