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 Contact corrosion
  2
• 2.2 Routing and attachment of lines
  2
• 3 Battery
  3
• 3.1 Battery - general notes
  3
• 3.2 Types of battery
  3
• Starter, current supply, CCS
  4
• 1 Battery
  4
• 1.1 Assembly overview – battery
  4
• 1.2 Removing and installing battery
  6
• 1.3 Disconnecting and connecting battery
  9
• 1.4 Removing and installing battery tray
  11
• 1.5 Checking battery
  12
• 1.6 Charging battery
  12
• 1.7 Removing and installing earth wire with battery monitor control unit J367
  12
• 1.8 Adapting battery monitor control unit J367
  13
• 2 Alternator
  14
• 2.1 Assembly overview - alternator
  14
• 2.2 Removing and installing alternator
  15
• 2.3 Checking alternator
  23
• 2.4 Removing and installing poly V-belt pulley
  24
• 2.5 Removing and installing voltage regulator
  33
• 3 Starter motor
  37
• 3.1 Assembly overview – starter
  37
• 3.2 Removing and installing starter
  40
• 4 Cruise control system (CCS)
  49
• 5 Start/stop system
  50
• 5.1 General description - start/stop system
  50
• 5.2 Overview of fitting locations - start/stop system
  50
• 6 Adaptive cruise control
  51
• 6.1 Overview of fitting locations - adaptive cruise control
  51
• 6.2 Removing and installing automatic distance control unit
  51
• 6.3 Calibrating adaptive cruise control
  52
• Gauges, instruments
  54
• 1 Dash panel insert
  54
• 1.1 Assembly overview - dash panel insert
  54
• 1.2 Removing and installing dash panel insert KX2
  55
• 2 Horn
  61
• 2.1 Assembly overview – horn (8Y0)
  61
• 2.2 Removing and installing left horn H33
  61
• 2.3 Assembly overview – horn (8Y1)
  63
• 2.4 Removing and installing treble horn H2 and bass horn H7
  63
• Windscreen wash/wipe system
  65
• 1 Windscreen wiper system
  65
• 1.1 Assembly overview - windscreen wiper system
  65
• 1.2 Moving wipers to service position
  67
• 1.3 Removing and installing wiper blade
  67
• 1.4 Removing and installing wiper arms
  69
• 1.5 Adjusting wiper arms
  70
• 1.6 Removing and installing wiper motor V
  72
• 1.7 Deactivating APP function of wiper motor
  73
• 1.8 Removing and installing rain and light sensor
  73
• 1.9 Repairing rain and light sensor
  75
• 2 Windscreen washer system
  79
• 2.1 Assembly overview - windscreen washer system
  79
• 2.2 Removing and installing washer fluid reservoir
  80
• 2.3 Removing and installing windscreen washer fluid level sender
  83
• 2.4 Removing and installing windscreen washer pump
  84
• 2.5 Removing and installing spray jets
  85
• 2.6 Adjusting spray jets
  86
• 3 Washer fluid lines
  87
• 3.1 Repairing washer fluid lines
  87
• Lights, bulbs, switches - exterior
  88
• 1 Headlights
  88
• 1.1 Assembly overview – headlight
  88
• 1.2 Removing and installing headlight
  89
• 1.3 Adjusting headlights
  94
• 1.4 Adjusting headlight installation position
  94
• 1.5 Removing and installing front turn signal bulb M5/M7
  95
• 1.6 Removing and installing headlight range control motor V48/V49
  97
• 1.7 Removing and installing dipped-beam headlight bulb
  97
• 1.8 Removing and installing headlight main beam bulb M30/M32
  97
• 1.9 Removing and installing side light bulb M1/M3
  97
• 1.11 Removing and installing bulbs for cornering light L148/L149
  98
• 1.12 Removing and installing output module for headlight J667/J668
  98
• 1.13 Removing and installing output module 1 for LED headlight A31/A27
  98
• 2 Fog light
  99
• 2.1 Assembly overview - fog lights
  99
• 2.2 Removing and installing fog light
  99
• 2.3 Removing and installing fog light bulb L22/L23
  100
• 2.4 Adjusting fog lights
  101
• 3 Lights in exterior mirror
  102
• 3.1 Assembly overview - lights in exterior mirror
  102
• 3.2 Removing and installing turn signal
  104
• 3.3 Removing and installing entry light in exterior mirror
  105
• 4 Tail light clusters
  107
• 4.1 Assembly overview - tail light cluster in body
  107
• 4.2 Assembly overview - tail lights in rear lid
  108
• 4.3 Removing and installing tail light in rear lid
  110
• 4.4 Adjusting installation position of tail light
  111
• 4.5 Removing and installing tail light cluster
  112
• 4.6 Removing and installing tail light bulb M2/M4
  113
• 4.7 Removing and installing rear fog light bulb L46/L47
  113
• 4.8 Removing and installing brake and tail light bulb M21/M22
  113
• 4.9 Removing and installing reversing light bulb
  113
• 4.10 Removing and installing turn signal bulb
  113
• 5 High-level brake light
  115
• 5.1 Assembly overview – high-level brake light
  115
• 5.2 Removing and installing high-level brake light
  115
• 5.3 Removing and installing high-level brake light
  116
• 6 Number plate light
  117
• 6.1 Removing and installing number plate light X4/X5
  117
• 6.2 Removing and installing bulb for number plate light X4/X5
  118
• 7 Entry and start authorisation system
  119
• 7.1 Overview of fitting locations - entry and start authorisation system
  119
• 7.2 Overview of fitting locations - keyless entry system
  121
• 7.3 Removing and installing interface for entry and start system J965
  124
• 7.4 Removing and installing door exterior handle contact sensor G415/G416
  127
• 7.5 Removing and installing driver side aerial for entry and start system R134
  127
• 7.7 Removing and installing rear bumper aerial for entry and start system R136
  127
• 7.8 Removing and installing interior aerial 1 for entry and start system R138
  128
• 7.9 Removing and installing interior aerial 2 for entry and start system R139
  129
• 8 Steering column switch module
  130
• 8.1 Assembly overview - steering column switch module
  130
• 8.2 Removing and installing lock cylinder
  132
• 8.3 Removing and installing ignition key withdrawal lock solenoid N376
  134
• 8.4 Removing and installing ignition/starter switch
  135
• 8.5 Removing and installing steering column switch module
  137
• 8.6 Removing and installing steering column electronics control unit J527
  143
• 8.7 Removing and installing turn signal switch E2
  149
• 8.8 Removing and installing cruise control system switch E45
  152
• 8.9 Removing and installing intermittent wiper switch E22
  152
• 8.10 Removing and installing immobiliser reader coil D2
  152
• 8.11 Removing and installing base for steering column combination switch
  153
• 8.12 Removing and installing steering lock housing
  153
• 9 Parking aid
  155
• 9.1 Assembly overview – parking aid
  155
• 9.2 Removing and installing parking aid control unit J446
  156
• 9.3 Removing and installing front parking aid warning buzzer H22
  157
• 9.4 Removing and installing rear parking aid warning buzzer H15
  158
• 9.5 Removing and installing front parking aid senders
  159
• 9.6 Removing and installing rear parking aid senders
  159
• 10 Blind Spot Monitor
  161
• 10.1 Assembly overview - Blind Spot Monitor
  161
• 10.2 Removing and installing warning lamp for Blind Spot Monitor K303/K304
  162
• 10.3 Removing and installing Blind Spot Monitor control unit J1086/J1087
  163
• 10.4 Calibrating Blind Spot Monitor
  164
• Lights, bulbs, switches - interior
  173
• 1 Lights
  173
• 1.1 Overview of fitting locations - lights in dash panel
  173
• 1.2 Overview of fitting locations - lights in front doors
  174
• 1.3 Overview of fitting locations - lights in centre console
  175
• 1.4 Overview of fitting locations - lights in luggage compartment
  176
• 1.5 Overview of fitting locations - lights in roof trim
  177
• 1.6 Removing and installing front footwell light K268/K269
  179
• 1.7 Removing and installing front footwell illumination bulb L151/L152
  181
• 1.9 Removing and installing storage compartment illumination bulb L120
  182
• 1.10 Removing and installing Central locking SAFELOCK function warning lamp K133
  182
• 1.11 Removing and installing reflectors in door
  183
• 1.12 Removing and installing entry light W92/W93
  184
• 1.14 Removing and installing light for door ambient lighting W86/W87
  185
• 1.15 Removing and installing selector lever position display Y26
  185
• 1.16 Removing and installing luggage compartment light W3
  186
• 1.17 Removing and installing illuminated vanity mirror W20/W14
  187
• 1.18 Removing and installing bulb for illuminated vanity mirror W20/W14
  187
• 1.19 Removing and installing bulb for front interior light W1
  188
• 1.20 Rear interior light
  191
• 1.21 Removing and installing bulb for rear interior light W43, equipment version 2
  192
• 1.22 Removing and installing bulb for rear reading light W11/W12
  193
• 1.23 Renewing bulb of rear interior light W47/W48
  193
• 2 Controls
  195
• 2.1 Overview of fitting locations - controls in dash panel
  195
• 2.2 Overview of fitting locations - controls in front doors
  196
• 2.3 Overview of fitting locations - controls in rear doors
  197
• 2.4 Overview of fitting locations - controls in centre console
  198
• 2.5 Overview of fitting locations - controls in luggage compartment
  199
• 2.6 Overview of fitting locations - controls in roof trim
  200
• 2.7 Removing and installing rotary light switch EX1
  202
• 2.8 Removing and installing TCS and ESP button E256
  204
• 2.9 Removing and installing parking aid button E266
  204
• 2.10 Removing and installing park assist steering button E581
  204
• 2.11 Removing and installing Start/Stop operation button E693
  204
• 2.12 Removing and installing driving mode selection button E735
  204
• 2.13 Removing and installing switch module in centre console EX23/EX30
  204
• 2.14 Removing and installing hazard warning light switch EX3
  206
• 2.15 Removing and installing buttons for seat heating E653/E654
  207
• 2.16 Removing and installing exterior mirror adjuster EX11
  207
• 2.17 Removing and installing operating unit for window regulator in driver door E512
  208
• 2.18 Removing and installing front passenger side window regulator button E716
  208
• 2.20 Removing and installing rear lid remote release button E233
  210
• 2.21 Removing and installing door contact switch F2/F3
  210
• 2.22 Removing and installing rear window regulator button E711/E713
  211
• 2.23 Removing and installing rear door contact switches F10/F11
  211
• 2.25 Removing and installing the starter button E378
  212
• 2.26 Removing and installing rear lid contact switch
  213
• 2.27 Removing and installing vanity mirror contact switch F147/F148
  213
• 2.28 Removing and installing sunroof button E325
  213
• 2.29 Removing and installing front interior light/reading light
  214
• 2.30 Removing and installing front reading light button E633/E634
  215
• 3 Anti-theft alarm system
  216
• 3.1 Assembly overview - interior monitor
  216
• 3.2 Removing and installing alarm horn/signal horn for anti-theft alarm system
  218
• 3.3 Removing and installing anti-theft alarm sensor G578
  220
• 4 Front camera for driver assist systems
  222
• 4.1 Removing and installing front camera for driver assist systems
  222
• 5 Cigarette lighter, socket
  223
• 5.1 Removing and installing cigarette lighter U1
  223
• 5.2 Removing and installing socket illumination bulb L42
  223
• 5.3 Removing and installing rear cigarette lighter illumination bulb L32
  223
• 5.4 Removing and installing electric socket U
  223
• Wiring
  224
• 1 Relay carriers, fuse holders, electronics boxes
  224
• 1.1 Overview of fitting locations - relay carriers, fuse holders, E-boxes
  224
• 1.2 Removing and installing electronics box (E-box)
  226
• 1.3 Removing and installing relay and fuse holder in electronics box
  228
• 1.4 Removing and installing relay and fuse holder behind dash panel on driver side
  231
• 2 Select Control units
  232
• 2.1 Overview of fitting locations - control units
  232
• 2.2 Removing and installing onboard supply control unit J519
  232
• 2.3 Removing and installing data bus diagnostic interface J533
  234
• 2.4 Removing and installing bracket for onboard supply control unit J519
  235
• 2.5 Renewing bracket for onboard supply control unit J519
  236
• 2.6 Removing and installing bracket for parking aid control unit J446
  236
• 3 Connectors
  238
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  238
• 4 Releasing and dismantling connector housings
  239
• 5 Repairing aerial wires
  240
• 6 Fibre optic cables
  241
• 7 Vehicle diagnosis, testing and information systems
  242