Electrical system

Chapter overview

• Technical data
  1
• 1 Notes on safety
  1
• 1.1 Safety precautions when working on the high-voltage system
  1
• 1.2 Safety precautions when working in the vicinity of high-voltage components
  2
• 1.4 Safety precautions when working on the coolant system
  2
• 2 Repair instructions
  3
• 2.1 Contact corrosion
  3
• 2.2 Routing and securing wiring
  3
• Starter, current supply, CCS
  4
• 1 Battery
  4
• 1.1 Assembly overview - battery
  4
• 1.2 Removing and installing battery
  5
• 1.3 Disconnecting and reconnecting battery
  6
• 1.4 Removing and installing battery tray
  9
• 1.5 Checking battery
  10
• 1.6 Charging battery
  10
• 1.7 Removing and installing earth wire with battery monitor control unit J367
  10
• 1.8 Adapting battery monitor control unit J367
  11
• 2 Alternator
  12
• 2.1 Alternator
  12
• 3 Starter
  13
• 3.1 Starter
  13
• 4 Cruise control system (CCS)
  14
• 4.1 Cruise control system (CCS)
  14
• Gauges, instruments
  15
• 1 Dash panel insert
  15
• 1.1 General notes
  15
• 1.2 Assembly overview - dash panel insert K
  15
• 1.3 Removing and installing dash panel insert K
  18
• 2 Horn
  21
• 2.1 Assembly overview - horn
  21
• 2.2 Removing and installing treble horn H2 / bass horn H7
  22
• Windscreen wash/wipe system
  23
• 1 Windscreen wiper system
  23
• 1.1 Assembly overview - windscreen wiper system
  23
• 1.2 Moving wipers to service position
  24
• 1.3 Removing and installing wiper blade
  24
• 1.4 Removing and installing wiper arms
  25
• 1.5 Adjusting wiper arms
  27
• 1.6 Renewing windscreen wiper rubber
  28
• 1.7 Removing and installing wiper motor V
  29
• 1.8 Renewing wiper motor V
  31
• 2 Windscreen washer system
  34
• 2.1 Assembly overview - windscreen washer system
  34
• 2.2 Removing and installing washer fluid reservoir
  35
• 2.3 Removing and installing windscreen and rear window washer pump V59
  36
• 2.4 Removing and installing washer jets
  36
• 2.5 Adjusting spray jets
  37
• 3 Rear window wiper system
  38
• 3.1 Assembly overview - rear window wiper system
  38
• 3.2 Removing and installing wiper blade
  39
• 3.3 Removing and installing wiper arm
  39
• 3.4 Adjusting wiper arm
  40
• 3.5 Removing and installing rear window wiper motor V12
  40
• 4 Rear window washer system
  42
• 4.1 Assembly overview - rear window washer system
  42
• 4.2 Removing and installing washer jet
  42
• 4.3 Adjusting spray jet
  43
• 5 Washer fluid lines
  44
• 5.1 Repairing washer fluid lines
  44
• Lights, bulbs, switches - exterior
  45
• 1 Headlight
  45
• 1.1 Assembly overview - headlight
  45
• 1.2 Removing and installing headlight
  46
• 1.3 Adjusting headlights
  48
• 1.4 Adjusting headlight installation position
  48
• 1.5 Removing and installing front turn signal bulb M5 / M7
  50
• 1.6 Installing repair kit for headlight housing
  51
• 1.7 Changing headlights over from driving on right to driving on left
  53
• 1.8 Changing headlights over from driving on left to driving on right
  53
• 1.9 Removing and installing headlight range control actuator V48 / V49
  53
• 1.11 Removing and installing side light bulb M1 / M3
  56
• 2 Daytime running lights
  58
• 2.1 Assembly overview - daytime running lights
  58
• 2.2 Removing and installing daytime running light bulb L174 / L175
  59
• 2.3 Removing and installing light strip for daytime running light
  60
• 3 Turn signal repeater
  61
• 3.1 Removing and installing turn signal repeater
  61
• 3.2 Removing and installing turn signal repeater bulb M18 / M19
  62
• 4 Tail lights
  63
• 4.1 Assembly overview - tail lights in body
  63
• 4.2 Removing and installing bulb carrier
  64
• 4.3 Removing and installing tail light bulb M2 / M4
  64
• 4.4 Removing and installing tail light
  64
• 4.5 Removing and installing rear fog light bulb L46 / L47
  65
• 4.6 Removing and installing brake and tail light bulb M21 / M22
  66
• 4.7 Removing and installing reversing light bulb M16 / M17
  66
• 4.8 Removing and installing turn signal bulb M6 / M8
  67
• 5 High-level brake light
  68
• 5.1 Removing and installing high-level brake light
  68
• 6 Number plate light
  70
• 6.1 Removing and installing number plate light X
  70
• 6.2 Removing and installing bulb for number plate light X
  70
• 7 Steering column switch module (SCSM)
  72
• 7.1 Removing and installing steering column switch module (SCSM)
  72
• 8 Parking aid system
  75
• 8.1 Overview of fitting locations - parking aid system
  75
• 8.2 Removing and installing parking aid control unit J446
  76
• 8.3 Removing and installing rear parking aid warning buzzer H15
  76
• 8.4 Adapting volume and frequency of rear parking aid warning buzzer H15
  77
• 8.5 Removing and installing rear parking aid senders G203 / G206 / G796
  77
• 8.6 Coding parking aid control unit J446
  79
• 8.7 Adapting parking aid control unit J446
  79
• 9 Emergency braking function
  80
• 9.1 Removing and installing emergency braking function sensor unit J939
  80
• Lights, bulbs, switches - interior
  82
• 1 Lights
  82
• 1.1 Removing and installing central locking SAFELOCK function warning lamp K133
  82
• 1.2 Checking central locking SAFELOCK function warning lamp K133
  82
• 1.3 Renewing bulbs for front interior light W1
  83
• 1.4 Removing and installing warning lamp for airbag deactivated on front passenger side K145
  84
• 2 Controls
  85
• 2.1 Removing and installing light switch E1
  85
• 2.2 Removing and installing headlight range control adjuster E102
  86
• 2.3 Removing and installing hazard warning light button E229
  87
• 2.4 Removing and installing switch module in middle of dash panel
  87
• 2.5 Removing and installing pushbutton for heated rear window E230
  88
• 2.6 Removing and installing button for seat heating E654 / E653
  88
• 2.7 Removing and installing key-operated switch to deactivate front passenger side airbag E224
  88
• 2.8 Removing and installing operating unit for window regulator in driver door E512
  89
• 2.9 Removing and installing front window regulator switch E40 / E41
  91
• 2.10 Removing and installing mirror adjustment switch E43
  92
• 2.11 Removing and installing driver side interior locking button for central locking system E308
  92
• 2.12 Removing and installing front interior light W1
  93
• 2.13 Removing and installing reading light bulbs W13 / W19
  96
• 2.14 Removing and installing centre console switch module EX23
  97
• 2.15 Removing and installing pushbutton for emergency braking function E773
  98
• 2.16 Removing and installing sliding sunroof adjustment regulator EX4
  98
• 3 Other interior lights and controls
  100
• 3.1 Removing and installing horn plate
  100
• 3.2 Removing and installing ignition/starter switch D
  100
• 3.3 Checking ignition/starter switch D
  101
• 3.4 Removing and installing lock cylinder
  101
• 3.5 Removing and installing steering lock housing
  103
• 4 Immobiliser
  106
• 4.1 Removing and installing immobiliser control unit
  106
• 4.2 Removing and installing reader coil
  107
• 5 Cigarette lighter, sockets
  108
• 5.1 Removing and installing cigarette lighter
  108
• 5.2 Removing and installing bulb for illuminating cigarette lighter
  108
• 5.3 Removing and installing 12 V socket
  108
• Wiring
  109
• 1 Relay carriers, fuse holders, electronics boxes
  109
• 1.1 Removing and installing electronics box (electronics box)
  109
• 1.2 Removing and installing relay and fuse holder in electronics box
  110
• 1.3 Removing and installing relay and fuse holder behind dash panel on driver side
  113
• 2 Control units
  119
• 2.1 Removing and installing onboard supply control unit
  119
• 2.2 Removing and installing data bus diagnostic interface
  122
• 3 Connectors
  123
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  123
• 4 Releasing and dismantling connector housings
  124
• 4.1 Releasing and dismantling connector housings
  124
• 5 Repair of aerial wires
  125
• 5.1 Repair of aerial wires
  125
• 6 Repair of fibre optic cables
  126
• 6.1 Repair of fibre optic cables
  126
• 7 Vehicle diagnostic, testing and information systems
  127
• 7.1 Vehicle diagnostic, testing and information systems
  127