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 Operation and safety notes for gas discharge lamps
  2
• 2 Repair instructions
  4
• 2.1 Contact corrosion
  4
• 2.2 Routing and attachment of lines
  4
• 3 Battery
  5
• 3.1 Battery - general notes
  5
• 3.2 Types of battery
  5
• Starter, current supply, CCS
  6
• 1 Battery
  6
• 1.1 Assembly overview – battery
  6
• 1.2 Removing and installing battery
  8
• 1.3 Adapting battery monitor control unit J367
  11
• 1.4 Disconnecting and connecting battery
  11
• 1.5 Removing and installing battery tray
  14
• 1.6 Checking battery
  14
• 1.7 Charging battery
  15
• 1.8 Removing and installing earth wire with battery monitor control unit J367
  15
• 1.9 Adapting battery monitor control unit J367
  16
• 2 Alternator
  18
• 2.1 Assembly overview - alternator
  18
• 2.2 Removing and installing alternator
  20
• 2.3 Checking alternator
  35
• 2.4 Checking poly V-belt
  35
• 2.5 Removing and installing poly V-belt pulley
  36
• 2.6 Removing and installing voltage regulator
  46
• 3 Starter motor
  50
• 3.1 Assembly overview – starter
  50
• 3.2 Removing and installing starter
  53
• 3.3 Checking starter
  63
• 4 Cruise control system (CCS)
  64
• 5 Start/stop system
  65
• 5.1 General description - start/stop system
  65
• 5.2 Removing and installing voltage stabiliser
  66
• Gauges, instruments
  68
• 1 Dash panel insert
  68
• 1.1 Assembly overview - dash panel insert
  68
• 1.2 Assembly overview - additional instruments
  68
• 1.3 Removing and installing dash panel insert KX2
  69
• 1.4 Removing and installing additional instruments
  71
• 1.5 Warning lamp symbols on dash panel insert
  72
• 1.6 Multi-pin connector pin assignment on dash panel insert
  74
• 1.7 Removing and installing ambient temperature sensor
  75
• 2 Horn
  76
• 2.1 Assembly overview - horn
  76
• 2.2 Removing and installing treble horn H2 and bass horn H7
  76
• Windscreen wash/wipe system
  78
• 1 Windscreen wiper system
  78
• 1.1 Assembly overview - windscreen wiper system
  78
• 1.2 Moving wipers to service position
  79
• 1.3 Removing and installing wiper arms
  79
• 1.4 Adjusting wiper arms
  81
• 1.5 Renewing windscreen wiper rubber
  82
• 1.6 Removing and installing wiper motor V
  83
• 1.7 Renewing wiper motor
  84
• 1.8 Removing and installing rain and light sensor
  85
• 1.9 Repairing rain and light sensor G397
  88
• 2 Windscreen washer system
  90
• 2.1 Assembly overview - windscreen washer system
  90
• 2.2 Removing and installing washer fluid reservoir
  91
• 2.3 Removing and installing windscreen washer fluid level sender
  93
• 2.4 Removing and installing windscreen washer pump
  93
• 2.5 Removing and installing spray jets
  94
• 2.6 Adjusting spray jets
  95
• 3 Washer fluid lines
  96
• 3.1 Repairing washer fluid lines
  96
• Lights, bulbs, switches - exterior
  97
• 1 Headlights
  97
• 1.1 Assembly overview – headlight
  97
• 1.2 Removing and installing headlight
  100
• 1.3 Removing and installing carrier plate for headlights
  101
• 1.4 Adjusting headlights
  103
• 1.5 Adjusting headlight installation position
  103
• 1.6 Converting headlights from driving on right to driving on left
  105
• 1.7 Converting headlights from driving on left to driving on right
  105
• 1.8 Removing and installing headlight range control motor V48/V49
  105
• 1.9 Removing and installing dipped-beam headlight bulb
  108
• 1.10 Removing and installing gas discharge bulb L13/L14
  110
• 1.11 Removing and installing side light bulb M1/M3
  112
• 1.12 Removing and installing daytime running light bulb L174/L175
  113
• 1.13 Removing and installing gas discharge bulb control unit J343/J344
  115
• 2 Fog lights
  116
• 2.1 Assembly overview - fog lights
  116
• 2.2 Removing and installing fog light
  117
• 2.3 Removing and installing fog light bulb L22/L23
  120
• 2.4 Adjusting fog lights
  121
• 3 Side marker light
  122
• 3.1 Removing and installing front side marker light
  122
• 3.2 Removing and installing side marking light bulb
  122
• 4 Lights in exterior mirror
  124
• 4.1 Assembly overview - lights in exterior mirror
  124
• 4.2 Removing and installing turn signal repeater bulb L131/L132
  124
• 4.3 Removing and installing entry light in exterior mirror
  125
• 5 Front turn signals
  127
• 5.1 Assembly overview - front turn signals
  127
• 5.2 Removing and installing front turn signal
  128
• 5.3 Removing and installing front turn signal bulb
  131
• 6 Tail lights
  133
• 6.1 Assembly overview - tail light cluster in body
  133
• 6.2 Removing and installing bulb carrier
  135
• 6.3 Removing and installing tail light cluster
  136
• 6.4 Removing and installing rear fog light
  136
• 6.5 Removing and installing rear fog light bulb L46/L47
  138
• 6.6 Removing and installing brake and tail light bulb M21/M22
  138
• 6.7 Removing and installing reversing light bulb
  139
• 6.8 Removing and installing turn signal bulb
  140
• 7 High-level brake light
  142
• 7.1 Removing and installing high-level brake light
  142
• 8 Number plate light
  145
• 8.1 Removing and installing number plate light X4/X5
  145
• 8.2 Removing and installing bulb for number plate light X4/X5
  145
• 9 Entry and start authorisation system
  147
• 9.1 Overview of fitting locations - entry and start authorisation system
  147
• 9.2 Removing and installing entry and start authorisation control unit J518
  150
• 9.3 Removing and installing door exterior handle contact sensor G415/G416
  153
• 9.4 Removing and installing interior aerial 1 for entry and start authorisation R138
  153
• 9.5 Removing and installing interior aerial 2 for entry and start authorisation R139
  154
• 9.6 Removing and installing driver side aerial for entry and start system R134
  154
• 9.9 Removing and installing rear bumper aerial for entry and start system R136
  156
• 9.10 Checking entry and start system aerials and sensors
  157
• 10 Steering column switch module
  158
• 10.1 Assembly overview - steering column switch module
  158
• 10.2 Removing and installing steering column electronics control unit J527
  162
• 10.3 Coding steering column electronics control unit J527
  164
• 10.4 Removing and installing steering column combination switch
  165
• 10.5 Removing and installing base for steering column combination switch
  171
• 10.6 Removing and installing ignition/starter switch
  183
• 10.7 Checking ignition/starter switch
  184
• 10.8 Removing and installing lock cylinder
  185
• 10.9 Removing and installing steering lock housing
  187
• 10.10 Removing and installing ignition key withdrawal lock solenoid N376
  188
• 11 Parking aid
  189
• 11.1 Assembly overview – parking aid
  189
• 11.2 Removing and installing parking aid control unit J446
  191
• 11.3 Adapting parking aid control unit J446 functions
  191
• 11.4 Removing and installing front parking aid warning buzzer H22
  192
• 11.5 Removing and installing rear parking aid warning buzzer H15
  193
• 11.6 Adapting volume and frequency of front parking aid warning buzzer
  194
• 11.7 Adapting volume and frequency of rear parking aid warning buzzer
  195
• 11.8 Removing and installing front parking aid senders
  195
• 11.9 Removing and installing rear parking aid senders
  198
• 11.10 Bonding sender bracket in bumper cover or in radiator grille
  200
• 11.11 Repairing sender bracket in bumper cover
  202
• 11.12 Renewing parking aid senders
  202
• 11.13 Testing parking aid senders
  203
• 12 Automatic headlight range control
  204
• 12.1 Assembly overview - automatic headlight range control
  204
• 12.2 Removing and installing headlight range control unit
  205
• 12.3 Making basic headlight setting
  206
• 13 Blind Spot Monitor
  208
• 13.1 Assembly overview - Blind Spot Monitor
  208
• 13.2 Removing and installing warning lamp for Blind Spot Monitor K303/K304
  208
• 13.3 Removing and installing Blind Spot Monitor control unit J1086/J1087
  209
• 13.4 Calibrating Blind Spot Monitor
  210
• Lights, bulbs, switches - interior
  218
• 1 Lights
  218
• 1.1 Overview of fitting locations - lights in luggage compartment
  218
• 1.2 Overview of fitting locations - lights in roof trim
  219
• 1.3 Removing and installing footwell light W9/W10
  219
• 1.4 Removing and installing front footwell illumination bulb L151/L152
  220
• 1.5 Removing and installing Central locking SAFELOCK function warning lamp K133
  221
• 1.6 Removing and installing luggage compartment light W3
  222
• 1.7 Removing and installing illuminated vanity mirror W20/W14
  224
• 1.8 Renewing front interior light bulb W1/W13/W19
  226
• 2 Controls
  228
• 2.1 Overview of fitting locations - controls in dash panel
  228
• 2.2 Overview of fitting locations - controls in front doors
  229
• 2.3 Overview of fitting locations - controls in centre console
  230
• 2.4 Overview of fitting locations - controls in roof trim
  231
• 2.5 Removing and installing rotary light switch EX1
  232
• 2.6 Removing and installing regulator for switch and instrument illumination E20
  234
• 2.7 Removing and installing headlight range control regulator E102
  234
• 2.8 Removing and installing Start/Stop operation button E693
  235
• 2.9 Removing and installing parking aid button E266
  236
• 2.11 Removing and installing hazard warning lights button E229
  238
• 2.12 Removing and installing mirror adjuster switch E43/E168
  239
• 2.13 Removing and installing operating unit for window regulator in driver door E512
  241
• 2.14 Removing and installing window regulator switch in front passenger door E107
  242
• 2.17 Removing and installing rear lid remote release button E233
  245
• 2.18 Removing and installing tyre pressure monitor display button E492
  246
• 2.19 Removing and installing door contact switch F2/F3
  247
• 2.20 Removing and installing starter button E378
  248
• 2.21 Removing and installing button 1 for tilting roof E582
  248
• 2.22 Removing and installing front interior light/reading light
  249
• 2.23 Removing and installing garage door operating unit E284
  253
• 2.24 Removing and installing interior monitoring deactivation switch E267
  254
• 3 Anti-theft alarm
  256
• 3.1 Assembly overview - interior monitor
  256
• 3.2 Removing and installing alarm horn H12
  258
• 3.3 Activating and deactivating anti-theft alarm
  259
• 3.4 Removing and installing interior monitoring sensor G273
  259
• 4 Immobiliser
  261
• 4.1 Removing and installing immobiliser control unit
  261
• 4.2 Removing and installing immobiliser reader coil
  263
• 4.3 Ignition key
  263
• Wiring
  265
• 1 Relay carriers, fuse holders, electronics boxes
  265
• 1.1 Overview of fitting locations - relay carriers, fuse holders, E-boxes
  265
• 1.2 Removing and installing electronics box (E-box)
  266
• 1.3 Removing and installing relay and fuse holder in electronics box
  267
• 1.4 Removing and installing relay and fuse holder behind dash panel on driver side
  269
• 2 Select Control units
  272
• 2.1 Overview of fitting locations - control units
  272
• 2.2 Removing and installing onboard supply control unit J519
  273
• 2.3 Adapting onboard supply control unit J519 functions
  275
• 2.4 Removing and installing converter box J935
  275
• 2.5 Removing and installing garage door operation control unit
  276
• 2.6 Removing and installing data bus diagnostic interface J533
  276
• 2.7 Adapting data bus diagnostic interface functions J533 functions
  279
• 2.8 Driver door control unit J386
  279
• 2.9 Front passenger door control unit J387
  280
• 3 Connectors
  281
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  281
• 4 Repairing aerial wires
  282
• 5 Vehicle diagnosis, testing and information systems
  283