Electrical system

Chapter overview

• Technical data
  1
• 1 Safety information
  1
• 1.1 Safety measures for working on vehicles with high-voltage system
  1
• 1.2 Safety measures for working in the vicinity of high-voltage components
  2
• 1.3 Safety measures for using testing and measuring instruments during a road test
  2
• 2 Repair notes
  3
• 2.1 Contact corrosion
  3
• 2.2 Routing and attachment of lines
  3
• 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
  7
• 1.3 Disconnecting and connecting battery
  8
• 1.4 Removing and installing battery tray
  10
• 1.5 Checking battery
  11
• 1.6 Charging battery
  11
• 1.7 Removing and installing earth wire with battery monitor control unit J367
  11
• 1.8 Adapting battery monitor control unit J367
  12
• 2 Cruise control system (CCS)
  13
• Gauges, instruments
  14
• 1 Dash panel insert
  14
• 1.1 Removing and installing dash panel insert KX2
  14
• 2 Horn
  16
• 2.1 Assembly overview - horn
  16
• 2.2 Removing and installing treble horn H2 and bass horn H7
  16
• Windscreen wash/wipe system
  18
• 1 Windscreen wiper system
  18
• 1.1 Assembly overview - windscreen wiper system
  18
• 1.2 Moving wipers to service position
  19
• 1.3 Removing and installing wiper blade
  19
• 1.4 Removing and installing wiper arms
  20
• 1.5 Adjusting wiper arms
  22
• 1.6 Removing and installing wiper motor V
  23
• 1.7 Renewing wiper motor
  24
• 1.8 Deactivating APP function of wiper motor
  27
• 1.9 Removing and installing rain and light sensor
  27
• 2 Windscreen washer system
  31
• 2.1 Assembly overview - windscreen washer system
  31
• 2.2 Removing and installing washer fluid reservoir
  32
• 2.3 Removing and installing windscreen washer pump
  33
• 2.4 Removing and installing washer jets
  34
• 2.5 Adjusting spray jets
  35
• 3 Rear window wiper system
  36
• 3.1 Assembly overview - rear window wiper system
  36
• 3.2 Removing and installing wiper blade
  37
• 3.3 Removing and installing wiper arm
  37
• 3.4 Adjusting wiper arm
  38
• 3.5 Removing and installing rear window wiper motor V12
  39
• 4 Rear window washer system
  41
• 4.1 Assembly overview - rear window washer system
  41
• 4.2 Removing and installing spray jet
  41
• 4.3 Adjusting spray jet
  42
• 5 Washer fluid lines
  43
• 5.1 Repairing washer fluid lines
  43
• Lights, bulbs, switches - exterior
  44
• 1 Headlights
  44
• 1.1 Assembly overview - headlight
  44
• 1.2 Removing and installing headlight
  45
• 1.3 Adjusting headlights
  47
• 1.4 Adjusting headlight installation position
  47
• 1.5 Removing and installing front turn signal bulb M5 / M7
  48
• 1.6 Installing repair kit for headlight housing
  50
• 1.7 Converting headlights from driving on right to driving on left
  53
• 1.8 Converting headlights from driving on left to driving on right
  53
• 1.9 Removing and installing headlight range control motor V48 / V49
  53
• 1.10 Removing and installing dipped beam bulb
  54
• 1.11 Removing and installing LED module for daytime running light and side light L176 / L177
  56
• 2 Daytime running light
  57
• 2.1 Assembly overview - daytime running lights
  57
• 2.2 Removing and installing daytime running light bulb L174 / L175
  57
• 2.3 Removing and installing light strip for daytime running light
  60
• 3 Fog lights
  61
• 3.1 Assembly overview - fog lights
  61
• 3.2 Removing and installing fog light
  62
• 3.3 Removing and installing fog light bulb L22 / L23
  63
• 3.4 Adjusting fog lights
  64
• 4 Lights in exterior mirror
  65
• 4.1 Removing and installing turn signal
  65
• 4.2 Removing and installing turn signal repeater bulb L131 / L132
  65
• 5 Tail lights
  66
• 5.1 Assembly overview - tail lights in body
  66
• 5.2 Removing and installing bulb carrier
  67
• 5.3 Removing and installing tail light cluster
  67
• 5.4 Removing and installing tail light bulb M2 / M4
  68
• 5.5 Removing and installing rear fog light
  69
• 5.6 Removing and installing rear fog light bulb L46 / L47
  69
• 5.7 Removing and installing brake and tail light bulb M21 / M22
  70
• 5.8 Removing and installing reversing light bulb
  70
• 5.9 Removing and installing turn signal bulb
  71
• 6 High-level brake light
  72
• 6.1 Assembly overview - high-level brake light
  72
• 6.2 Removing and installing high-level brake light
  72
• 7 Number plate light
  75
• 7.1 Removing and installing number plate light X4 / X5
  75
• 7.2 Removing and installing bulb for number plate light X4 / X5
  75
• 8 Steering column switch module
  76
• 8.1 Assembly overview - steering column switch module
  76
• 8.2 Removing and installing steering column switch module
  77
• 8.3 Removing and installing steering column electronics control unit J527
  79
• 8.4 Removing and installing base for steering column combination switch
  81
• 8.5 Removing and installing turn signal switch E2
  81
• 8.6 Removing and installing cruise control system switch E45
  81
• 8.7 Removing and installing intermittent wiper switch E22
  81
• 8.8 Removing and installing ignition/starter switch
  82
• 8.9 Removing and installing lock cylinder
  82
• 8.10 Removing and installing steering lock housing
  84
• 8.11 Removing and installing ignition key withdrawal lock solenoid N376
  86
• 9 Parking aid
  87
• 9.1 Assembly overview – parking aid
  87
• 9.2 Removing and installing parking aid control unit J446
  87
• 9.3 Removing and installing rear parking aid warning buzzer H15
  88
• 9.4 Removing and installing rear parking aid senders
  89
• 10 Emergency braking function
  91
• 10.1 Removing and installing City Emergency Braking System
  91
• Lights, bulbs, switches - interior
  93
• 1 Lights
  93
• 1.1 Removing and installing Central locking SAFELOCK function warning lamp K133
  93
• 1.2 Renewing front interior light bulb W1
  93
• 1.3 Removing and installing bulb for front reading light W13 / W19
  95
• 2 Controls
  97
• 2.1 Removing and installing rotary light switch EX1
  97
• 2.2 Removing and installing headlight range control regulator E102
  98
• 2.3 Removing and installing switch module in middle of dash panel
  98
• 2.4 Removing and installing hazard warning light button E229
  100
• 2.5 Removing and installing heated rear window button
  100
• 2.6 Removing and installing buttons for seat heating E653 / E654
  100
• 2.7 Removing and installing button for driver assist systems E617
  100
• 2.8 Removing and installing mirror adjustment switch E43 / E168
  101
• 2.9 Removing and installing operating unit for window regulator in driver door E512
  101
• 2.10 Removing and installing front window regulator switch
  102
• 2.11 Removing and installing driver side interior locking button for central locking system E308
  103
• 2.12 Removing and installing centre console switch module
  104
• 2.13 Removing and installing button for emergency braking function
  105
• 2.14 Removing and installing sliding sunroof adjustment regulator
  105
• 2.15 Removing and installing front interior light/reading light
  106
• 3 Immobiliser
  111
• 3.1 Removing and installing immobiliser control unit
  111
• 3.2 Removing and installing immobiliser reader coil
  111
• 4 Front camera for assist systems
  112
• 4.1 Assembly overview - front camera for assist systems
  112
• 4.2 Removing and installing front camera for driver assist systems R242
  112
• 4.3 Calibrating front camera for driver assist systems R242
  114
• 5 Cigarette lighter, socket
  121
• 5.1 Removing and installing cigarette lighter U1
  121
• 5.2 Removing and installing electric socket U
  121
• 5.3 Removing and installing bulb for illuminating cigarette lighter
  121
• Wiring
  122
• 1 Relay carriers, fuse holders, electronics boxes
  122
• 1.1 Removing and installing electronics box (E-box)
  122
• 1.2 Removing and installing relay and fuse holder in electronics box
  124
• 1.3 Removing and installing relay and fuse holder behind dash panel on driver side
  126
• 2 Control units
  132
• 2.1 Removing and installing onboard supply control unit J519
  132
• 2.2 Removing and installing data bus diagnostic interface J533
  133
• 3 Connectors
  134
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  134
• 4 Releasing and dismantling connector housings
  135
• 5 Repairing aerial wires
  136
• 6 Vehicle diagnosis, testing and information systems
  137