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
• 1.2 Safety precautions when using test and measuring equipment during a road test
  1
• 2 Repair notes
  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
  8
• 1.3 Disconnecting and connecting battery
  14
• 1.4 Removing and installing battery tray
  17
• 1.5 Checking battery
  22
• 1.6 Charging battery
  22
• 1.7 Removing and installing earth wire with battery monitor control unit J367
  22
• 1.8 Adapting battery monitor control unit J367
  24
• 2 Jump-start connection
  25
• 2.1 Assembly overview - jump-start connection
  25
• 2.2 Removing and installing jump-start connection
  25
• 3 Alternator
  29
• 3.1 Assembly overview - alternator
  29
• 3.2 Removing and installing alternator
  31
• 3.3 Checking alternator
  42
• 3.4 Removing and installing poly V-belt pulley
  42
• 3.5 Removing and installing voltage regulator
  51
• 4 Starter motor
  55
• 4.1 Assembly overview – starter
  55
• 4.2 Removing and installing starter
  57
• 4.3 Checking starter
  63
• 5 Cruise control system (CCS)
  64
• 6 Start/stop system
  65
• 6.1 General description - start/stop system
  65
• 7 Adaptive cruise control
  66
• 7.1 Overview of fitting locations - adaptive cruise control
  66
• 7.2 Removing and installing automatic distance control unit
  66
• 7.3 Calibrating adaptive cruise control
  67
• Gauges, instruments
  68
• 1 Dash panel insert
  68
• 1.1 Assembly overview - dash panel insert
  68
• 1.2 Removing and installing dash panel insert KX2
  69
• 2 Horn
  74
• 2.1 Assembly overview - horn
  74
• 2.2 Removing and installing treble horn H2 and bass horn H7
  74
• Windscreen wash/wipe system
  76
• 1 Windscreen wiper system
  76
• 1.1 Assembly overview - windscreen wiper system
  76
• 1.2 Moving wipers to service position
  78
• 1.3 Removing and installing wiper blade
  78
• 1.4 Removing and installing wiper arms
  79
• 1.5 Adjusting wiper arms
  81
• 1.6 Removing and installing wiper motor V
  83
• 1.7 Removing and installing rain and light sensor
  85
• 2 Windscreen washer system
  89
• 2.1 Assembly overview - windscreen washer system
  89
• 2.2 Removing and installing filler neck of washer fluid reservoir
  91
• 2.3 Removing and installing washer fluid reservoir
  91
• 2.4 Removing and installing windscreen washer fluid level sender
  94
• 2.5 Removing and installing windscreen washer pump
  94
• 2.6 Removing and installing spray jets
  95
• 2.7 Adjusting spray jets
  96
• 3 Rear window wiper system
  98
• 3.1 Assembly overview - rear window wiper system
  98
• 3.2 Removing and installing wiper blade
  99
• 3.3 Removing and installing wiper arm
  99
• 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
  104
• 4.3 Removing and installing rear window washer pump
  105
• 4.4 Removing and installing spray jet
  105
• 4.5 Adjusting spray jet
  105
• 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
  112
• 1.3 Adjusting headlights
  115
• 1.4 Adjusting headlight installation position
  115
• 1.5 Removing and installing front turn signal bulb M5/M7
  116
• 1.6 Installing repair kit for headlight housing
  117
• 1.7 Converting headlights from driving on right to driving on left
  118
• 1.8 Converting headlights from driving on left to driving on right
  118
• 1.9 Removing and installing headlight range control motor V48/V49
  119
• 1.10 Removing and installing headlight dipped beam bulb
  122
• 1.11 Removing and installing headlight main beam bulb M30/M32
  124
• 1.12 Removing and installing daytime running light
  125
• 1.13 Removing and installing bulbs for cornering light L148/L149
  127
• 1.14 Removing and installing output module 1 for LED headlight A31/A27
  127
• 2 Fog lights
  129
• 2.1 Assembly overview - fog lights
  129
• 2.2 Removing and installing fog light
  129
• 2.3 Removing and installing fog light bulb L22/L23
  129
• 2.4 Adjusting fog lights
  130
• 3 Lights in exterior mirror
  131
• 3.1 Assembly overview - lights in exterior mirror
  131
• 3.2 Removing and installing turn signal
  133
• 4 Tail lights
  134
• 4.1 Assembly overview - tail light cluster in body
  134
• 4.2 Removing and installing bulb carrier
  136
• 4.3 Removing and installing tail light cluster
  136
• 4.4 Adjusting installation position of tail light
  137
• 4.5 Removing and installing tail light bulb M2/M4
  138
• 4.6 Removing and installing rear fog light bulb L46/L47
  139
• 4.7 Removing and installing brake and tail light bulb M21/M22
  140
• 4.8 Removing and installing reversing light bulb
  141
• 4.9 Removing and installing turn signal bulb
  142
• 5 High-level brake light
  143
• 5.1 Assembly overview – high-level brake light
  143
• 5.2 Removing and installing high-level brake light
  143
• 6 Number plate light
  146
• 6.1 Removing and installing number plate light X4/X5
  146
• 6.2 Removing and installing bulb for number plate light X4/X5
  147
• 7 Entry and start authorisation system
  148
• 7.1 Overview of fitting locations - entry and start authorisation system
  148
• 7.2 Overview of fitting locations - keyless entry system
  149
• 7.3 Removing and installing interface for entry and start system J965
  150
• 7.5 Removing and installing interior aerial 1 for entry and start system R138
  152
• 7.6 Removing and installing interior aerial 2 for entry and start system R139
  153
• 7.7 Removing and installing left entry and start authorisation aerial R200
  153
• 7.8 Removing and installing right entry and start authorisation aerial R201
  154
• 7.9 Removing and installing rear bumper aerial for entry and start system R136
  154
• 8 Steering column switch module
  155
• 8.1 Assembly overview - steering column switch module
  155
• 8.2 Removing and installing lock cylinder
  157
• 8.3 Removing and installing ignition key withdrawal lock solenoid N376
  160
• 8.4 Removing and installing ignition/starter switch
  160
• 8.5 Removing and installing steering column switch module
  162
• 8.6 Removing and installing steering column electronics control unit J527
  166
• 8.7 Removing and installing turn signal switch E2
  168
• 8.8 Removing and installing cruise control system switch E45
  172
• 8.9 Removing and installing intermittent wiper switch E22
  172
• 8.10 Removing and installing base for steering column combination switch
  172
• 8.11 Removing and installing steering lock housing
  173
• 9 Parking aid
  176
• 9.1 Assembly overview – parking aid
  176
• 9.2 Removing and installing parking aid control unit J446
  179
• 9.3 Removing and installing front parking aid warning buzzer H22
  180
• 9.4 Removing and installing rear parking aid warning buzzer H15
  181
• 9.5 Removing and installing front parking aid senders
  182
• 9.6 Removing and installing rear parking aid senders
  183
• 10 Park assist steering
  185
• 10.1 Assembly overview - park assist steering
  185
• 10.2 Removing and installing park assist steering control unit J791
  186
• 10.3 Removing and installing front senders
  186
• 10.4 Removing and installing rear senders
  186
• 11 Automatic headlight range control
  188
• 11.1 Assembly overview - automatic headlight range control
  188
• 11.2 Removing and installing headlight range control unit
  189
• 12 Blind Spot Monitor
  191
• 12.1 Assembly overview - Blind Spot Monitor
  191
• 12.3 Removing and installing Blind Spot Monitor control unit J1086/J1087
  192
• Lights, bulbs, switches - interior
  194
• 1 Lights
  194
• 1.1 Overview of fitting locations - lights in dash panel
  194
• 1.2 Overview of fitting locations - lights in front doors
  195
• 1.3 Overview of fitting locations - lights in centre console
  196
• 1.4 Overview of fitting locations - lights in luggage compartment
  197
• 1.5 Overview of fitting locations - lights in roof trim
  198
• 1.6 Removing and installing front footwell light K268/K269
  200
• 1.7 Removing and installing bulb for front footwell light L151/L152
  201
• 1.8 Removing and installing Central locking SAFELOCK function warning lamp K133
  202
• 1.9 Removing and installing storage compartment illumination bulb L120
  203
• 1.10 Removing and installing interior door handle illumination bulb L146/L147
  203
• 1.11 Removing and installing bulb for background lighting in front door L164/L165
  204
• 1.12 Removing and installing light for left dashboard ambient lighting L229
  205
• 1.13 Removing and installing light for right dashboard ambient lighting L230
  205
• 1.14 Removing and installing light for centre dashboard ambient lighting L231
  206
• 1.15 Removing and installing selector lever position display Y26
  207
• 1.16 Removing and installing luggage compartment light W3
  207
• 1.17 Removing and installing bulb for luggage compartment light W3
  207
• 1.18 Removing and installing illuminated vanity mirror W20/W14
  208
• 1.19 Renewing front interior light bulb W1/W13/W19
  209
• 1.20 Renewing bulb for rear interior light W43
  213
• 1.21 Removing and installing bulb for rear reading light W11/W12
  214
• 2 Controls
  216
• 2.1 Overview of fitting locations - controls in dash panel
  217
• 2.2 Overview of fitting locations - controls in front doors
  219
• 2.3 Overview of fitting locations - controls in rear doors
  219
• 2.4 Overview of fitting locations - controls in centre console
  220
• 2.5 Overview of fitting locations - controls in luggage compartment
  221
• 2.6 Overview of fitting locations - controls in roof trim
  222
• 2.7 Removing and installing rotary light switch EX1
  225
• 2.8 Removing and installing headlight range control regulator E102
  225
• 2.9 Removing and installing TCS and ESP button E256
  227
• 2.10 Removing and installing parking aid button E266
  227
• 2.11 Removing and installing park assist steering button E581
  227
• 2.12 Removing and installing Start/Stop operation button E693
  227
• 2.13 Removing and installing driving mode selection button E735
  227
• 2.15 Removing and installing switch module in centre console
  229
• 2.16 Removing and installing hazard warning light switch EX3
  229
• 2.17 Removing and installing buttons for seat heating E653/E654
  230
• 2.18 Removing and installing exterior mirror adjuster EX11
  230
• 2.19 Removing and installing operating unit for window regulator in driver door E512
  231
• 2.20 Removing and installing window regulator switch in front passenger door EX27
  232
• 2.22 Removing and installing door contact switch F2/F3
  234
• 2.23 Removing and installing rear window regulator switch in door E52/E54
  234
• 2.24 Removing and installing rear door contact switches F10/F11
  235
• 2.25 Removing and installing the starter button E378
  235
• 2.26 Removing and installing rear lid contact switch
  236
• 2.27 Removing and installing vanity mirror contact switch F147/F148
  236
• 2.28 Removing and installing sunroof button E325
  236
• 2.29 Removing and installing front interior light/reading light
  237
• 2.30 Removing and installing rear interior light/reading light
  240
• 3 Anti-theft alarm
  243
• 3.1 Assembly overview - interior monitor
  243
• 3.2 Removing and installing alarm horn H12
  243
• 3.3 Removing and installing anti-theft alarm sensor G578
  244
• 4 Immobiliser
  246
• 4.1 Removing and installing immobiliser control unit
  246
• 4.2 Removing and installing immobiliser reader coil
  246
• 5 Towing bracket
  248
• 5.1 Assembly overview - socket, trailer detector control unit
  248
• 5.2 Trailer socket
  248
• 5.3 Removing and installing trailer detector control unit J345
  249
• 6 Front camera for driver assist systems
  250
• 6.1 Assembly overview - front camera for assist systems
  250
• 6.2 Removing and installing front camera for driver assist systems R242
  250
• 6.3 Calibrating front camera for driver assist systems R242
  252
• 7 Cigarette lighter, socket
  261
• 7.1 Removing and installing cigarette lighter U1
  261
• 7.2 Removing and installing socket illumination bulb L42
  261
• 7.3 Removing and installing rear cigarette lighter illumination bulb L32
  261
• 7.4 Removing and installing electric socket U
  261
• Wiring
  262
• 1 Relay carriers, fuse holders, electronics boxes
  262
• 1.1 Overview of fitting locations - relay carriers, fuse holders, E-boxes
  262
• 1.2 Assembly overview - fuse holder A SA
  264
• 1.3 Assembly overview - main fuse carrier
  266
• 1.4 Removing and installing electronics box (E-box)
  266
• 1.5 Removing and installing relay and fuse holder in electronics box
  268
• 1.6 Removing and installing relay and fuse holder behind dash panel on driver side
  270
• 1.7 Removing and installing fuse holder A SA
  273
• 1.8 Removing and installing main fuse carrier
  275
• 2 Select 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
• 2.4 Removing and installing bracket for onboard supply control unit J519
  280
• 2.5 Removing and installing parking aid control unit J446/park assist steering control unit J791
  280
• 3 Connectors
  282
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  282
• 4 Releasing and dismantling connector housings
  283
• 5 Repairing aerial wires
  284
• 6 Fibre optic cables
  285
• 7 Vehicle diagnosis, testing and information systems
  286