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 General information
  4
• 3 Repair instructions
  5
• 3.1 Contact corrosion
  5
• 3.2 Routing and attachment of lines
  5
• Starter, current supply, CCS
  6
• 1 Battery
  6
• 1.1 General description - battery
  6
• 1.2 Assembly overview – battery
  6
• 1.3 Disconnecting and connecting battery
  8
• 1.4 Removing and installing battery
  12
• 1.5 Checking battery
  18
• 1.6 Charging battery
  19
• 2 Starter motor
  20
• 2.1 Assembly overview – starter
  20
• 2.2 Removing and installing starter
  21
• 2.3 Checking starter
  55
• 3 Alternator
  56
• 3.1 Assembly overview - alternator
  56
• 3.2 Removing and installing alternator
  73
• 3.3 Checking alternator
  109
• 3.4 Repairing alternator
  109
• 3.5 Checking poly V-belt
  118
• 4 Cruise control system (CCS)
  119
• 5 Start/stop system
  120
• 5.1 General description - start/stop system
  120
• 5.2 Removing and installing start-stop operation button
  121
• 5.3 Removing and installing voltage stabiliser
  121
• 5.4 Removing and installing battery monitoring control unit
  125
• Gauges, instruments
  126
• 1 Dash panel insert
  126
• 1.1 General description - dash panel insert
  126
• 1.2 Renewing dash panel insert
  127
• 1.3 Removing and installing dash panel insert
  127
• 1.4 Pin assignment - dash panel insert
  128
• 1.5 Warning lamp symbols in dash panel insert
  128
• 1.6 Coding dash panel insert
  129
• 2 Horn
  131
• 2.1 Removing and installing treble horn and bass horn
  131
• 2.2 Checking treble horn and bass horn
  132
• Windscreen wash/wipe system
  133
• 1 Windscreen wiper system
  133
• 1.1 Moving wipers to service position
  133
• 1.2 Deactivating APP function of windscreen wiper motor
  133
• 1.3 Removing and installing wiper arms
  134
• 1.4 Removing and installing wiper frame with linkage and wiper motor
  136
• 1.5 Removing and installing wiper motor
  138
• 1.6 Removing and installing wiper blades
  139
• 1.7 Renewing windscreen wiper rubber
  141
• 1.8 Adjusting windscreen wiper park position
  143
• 1.9 Removing and installing rain and light sensor
  144
• 1.10 Coding rain and light sensor
  147
• 2 Windscreen washer system
  148
• 2.1 Assembly overview - windscreen washer system
  148
• 2.2 Removing and installing washer fluid reservoir
  150
• 2.3 Removing and installing filler pipe for washer fluid reservoir
  153
• 2.4 Removing and installing windscreen and rear window washer pump V59
  154
• 2.5 Removing and installing windscreen washer fluid level sender G33
  157
• 2.6 Removing and installing windscreen spray jets
  159
• 2.7 Adjusting spray jets for windscreen washer system
  160
• 3 Rear window wiper system
  161
• 3.1 Assembly overview - rear window wiper system
  161
• 3.2 Removing and installing rear window wiper arm
  163
• 3.3 Removing and installing rear window wiper motor
  165
• 3.4 Adjusting rear window wiper park position
  168
• 3.5 Removing and installing rear window wiper blade
  170
• 3.6 Renewing rear window wiper rubber
  171
• 4 Rear window washer system
  174
• 4.1 Assembly overview - rear window washer system
  174
• 4.2 Removing and installing rear window spray jet
  178
• 4.3 Adjusting spray jet for rear window washer system
  178
• 5 Headlight washer system
  179
• 5.1 General description - headlight washer system
  179
• 5.2 Assembly overview - headlight washer system
  179
• 5.3 Removing and installing headlight washer system pump V11
  181
• 5.4 Removing and installing spray jet pop-up cylinders
  183
• 5.5 Removing and installing spray jet retainer
  187
• 5.6 Adjusting headlight washer system spray jets
  188
• 5.7 Bleeding headlight washer system
  188
• 6 Washer fluid line hose couplings
  189
• 7 Hose repair
  190
• Lights, bulbs, switches - exterior
  191
• 1 Headlights
  192
• 1.1 Assembly overview – headlight
  192
• 1.2 Removing and installing headlight
  201
• 1.3 Adjusting headlights
  212
• 1.4 Adjusting headlight installation position
  212
• 1.5 Removing and installing front turn signal bulb M5/M7
  218
• 1.6 Removing and installing bulb for daytime running light and side light
  224
• 1.7 Removing and installing daytime running light and main beam bulb
  226
• 1.8 Removing and installing side light bulb M1/M3
  227
• 1.9 Removing and installing main beam and dipped beam bulb
  231
• 1.10 Removing and installing dipped beam bulb M29/M31
  233
• 1.11 Removing and installing main beam bulb M30/M32
  237
• 1.12 Removing and installing bulb for static cornering light M51/M52
  240
• 1.13 Removing and installing gas discharge bulb L13/L14
  242
• 1.15 Removing and installing dynamic cornering light control motor V318/V319
  244
• 1.16 Removing and installing swivel module position sensor G475/G474
  245
• 1.17 Removing and installing dipped beam screen
  245
• 1.18 Removing and installing gas discharge bulb control unit J343/J344
  245
• 1.19 Removing and installing output module for headlight J667/J668
  247
• 1.21 Removing and installing cornering light and headlight range control unit J745
  251
• 1.22 Coding cornering light and headlight range control unit J745
  252
• 1.23 Headlight conversion for left-hand/right-hand traffic
  253
• 1.24 Removing and installing headlight range control motor V48/V49
  274
• 1.25 Removing and installing front left vehicle level sender G78
  277
• 1.26 Removing and installing rear left vehicle level sender G76
  279
• 1.27 Installing repair kit for headlight housing
  282
• 2 Fog lights
  295
• 2.1 Removing and installing fog light
  295
• 2.2 Removing and installing fog light bulb
  297
• 2.3 Adjusting fog lights
  298
• 3 Side turn signals
  299
• 3.1 Removing and installing side turn signals
  299
• 3.2 Removing and installing turn signal light bulb
  301
• 4 Tail lights
  302
• 4.1 Assembly overview - tail light
  302
• 4.2 Removing and installing tail light cluster
  304
• 4.3 Removing and installing tail light bulb carrier
  307
• 5 High-level brake light
  308
• 5.1 Removing and installing high-level brake light
  308
• 5.2 Removing and installing additional brake light bulb/LEDs
  309
• 6 Number plate light
  310
• 6.1 Removing and installing number plate light
  310
• 6.2 Removing and installing bulb for number plate light
  311
• 7 Steering column switch module, vehicles up to model year 2010
  312
• 7.4 Removing and installing steering column electronics control unit J527
  315
• 7.5 Removing and installing coil connector F350
  317
• 7.6 Removing and installing turn signal switch E2
  318
• 7.7 Removing and installing windscreen wiper switch E
  320
• 7.8 Removing and installing steering column switch module base
  321
• 7.9 Coding steering column electronics control unit
  323
• 7.10 Steering column electronics control unit - final control diagnosis
  323
• 8 Steering column switch module, vehicles as of model year 2011
  325
• 8.4 Removing and installing steering column electronics control unit J527
  329
• 8.5 Steering column combination switch E595
  333
• 8.6 Steering column switch module base
  335
• 8.7 Coding steering column electronics control unit J527
  339
• 9 Rear parking aid
  340
• 9.1 General description - rear parking aid system
  340
• 9.2 Assembly overview - rear parking aid system
  341
• 9.3 Removing and installing rear parking aid control unit
  342
• 9.4 Adapting rear parking aid control unit
  343
• 9.5 Removing and installing rear parking aid senders
  343
• 9.6 Removing and installing parking aid system warning buzzer
  344
• 10 Park assist steering
  346
• 10.1 General description - park assist steering
  346
• 10.2 Assembly overview - park assist steering
  348
• 10.3 Removing and installing parking aid control unit J446
  350
• 10.4 Coding parking aid control unit J446
  351
• 10.5 Adapting parking aid control unit J446
  351
• 10.6 Removing and installing front parking aid senders
  352
• 10.7 Removing and installing rear parking aid senders
  355
• 10.8 Removing and installing front park assist steering sender
  359
• 10.9 Removing and installing rear park assist steering sender
  362
• 10.10 Renewing parking aid sender or park assist steering sender
  365
• 10.11 Renewing retainers for parking aid senders or park assist steering senders
  366
• 10.12 Removing and installing park assist steering button E581
  371
• 10.13 Removing and installing parking aid button E266
  371
• 10.14 Removing and installing front parking aid warning buzzer
  371
• 10.15 Removing and installing rear parking aid warning buzzer
  372
• 10.16 Adapting parking aid warning buzzer
  373
• 11 Towing bracket
  374
• 11.1 General description - towing bracket
  374
• 11.2 Removing and installing trailer socket U10
  374
• 11.3 Pin assignment of trailer socket U10
  377
• 11.4 Removing and installing trailer detector control unit
  378
• Lights, bulbs, switches - interior
  381
• 1 Lights and controls in the dash panel
  381
• 1.1 Removing and installing light switch
  381
• 1.3 Removing and installing front passenger side airbag deactivated warning lamp
  383
• 1.4 Removing and installing hazard warning light switch E229
  384
• 2 Lights and controls in front doors
  387
• 2.1 Removing and installing operating unit for window regulator in driver door E512
  387
• 2.2 Removing and installing window regulator switch in front passenger door E107
  389
• 2.3 Removing and installing mirror adjustment switch E43
  390
• 2.5 Removing and installing door contact switch F2/F3/F10/F11
  393
• 3 Lights and controls in sliding doors
  394
• 3.1 Removing and installing contact strip in left sliding door
  394
• 3.2 Removing and installing contact strip in right sliding door
  396
• 3.3 Removing and installing rear door contact switches
  396
• 4 Lights and controls in the centre console
  398
• 4.1 Removing and installing buttons in centre console storage compartment
  398
• 5 Lights and controls in luggage compartment
  400
• 5.1 Removing and installing luggage compartment light
  400
• 5.2 Removing and installing bulb for luggage compartment light
  401
• 5.3 Removing and installing luggage compartment light switch F5
  402
• 5.4 Removing and installing central locking switch in left wing door F213
  402
• 5.5 Removing and installing rear door contact switches
  402
• 5.6 Removing and installing rear lid release switch E165
  402
• 6 Lights and controls in the roof trim
  404
• 6.1 Removing and installing front interior light, vehicles as of 06.07
  404
• 6.2 Removing and installing bulb for front interior light, vehicles as of 06.07
  405
• 6.4 Removing and installing bulb for front interior light
  407
• 6.5 Removing and installing bulb for front reading light
  408
• 6.6 Removing and installing left centre reading lamp and right centre reading lamp
  409
• 6.7 Removing and installing rear left interior light and rear right interior light
  410
• 6.8 Removing and installing bulbs for centre reading lights and rear interior lights
  411
• 6.9 Removing and installing vanity mirror light
  412
• 6.10 Removing and installing light for vanity mirror
  413
• 7 Lights and controls in engine compartment
  414
• 7.1 Removing and installing bonnet contact switch
  414
• 8 Other interior lights and controls
  415
• 9 Cigarette lighter and 12 V socket
  417
• 9.1 Removing and installing cigarette lighter U1
  417
• 9.2 Removing and installing 12 V socket
  417
• 10 Immobiliser
  419
• 10.1 General description - immobiliser
  419
• 10.2 Removing and installing immobiliser control unit
  419
• 10.3 Removing and installing immobiliser reader coil
  419
• 10.4 Removing and installing ignition key variable code transponder
  419
• 10.5 Adapting ignition keys to the immobiliser
  420
• 10.6 Adapting ignition keys to the convenience system
  420
• 11 Anti-theft alarm system
  422
• 11.1 General description - anti-theft alarm system (ATA)
  422
• 11.3 Removing and installing interior monitoring sensor
  423
• 11.4 Removing and installing vehicle inclination sender
  424
• 11.5 Removing and installing central locking and anti-theft alarm system aerial
  425
• 11.6 Removing and installing alarm horn
  425
• 11.7 Reading alarm sources of anti-theft alarm
  426
• 12 Ignition/starter switch and lock cylinder
  428
• 12.1 Removing and installing ignition/starter switch
  428
• 12.2 Checking ignition/starter switch
  432
• 12.3 Removing and installing lock cylinder
  433
• 12.4 Removing and installing steering lock housing
  439
• 12.5 Removing and installing ignition key withdrawal lock solenoid
  439
• Wiring
  442
• 1 Relay carriers, fuse holders, electronics boxes
  442
• 1.1 Overview of fitting locations - relay carriers, fuse holders, E-boxes
  442
• 1.2 Removing and installing fuse holder on left beneath dash panel
  443
• 1.3 Removing and installing relay carrier on left of dash panel
  444
• 1.4 Removing and installing relay carrier on onboard supply control unit
  445
• 1.5 Removing and installing electronics box on left side of engine compartment
  448
• 2 Select Control units
  454
• 2.3 Removing and installing data bus diagnostic interface
  463
• 2.4 Removing and installing convenience system central control unit
  465
• 2.5 Removing and installing special vehicle control unit
  468
• 3 Connectors
  478
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  478
• 3.2 Converting airbag and belt tensioner wire
  478
• 4 Renewing lambda probe
  483
• 5 Vehicle diagnosis, testing and information systems
  484