Electrical system

Chapter overview

• Technical data
  1
• Starter, current supply, CCS
  2
• 1 Battery
  2
• 1.1 Assembly overview - battery
  2
• 1.2 Assembly overview - pyrotechnic battery isolator
  4
• 1.3 Disconnecting and connecting battery
  4
• 1.4 Removing and installing battery
  9
• 1.5 Checking battery
  16
• 1.6 Charging battery
  16
• 1.7 Removing and installing battery isolator
  17
• 1.8 Adapting battery monitor control unit J367
  19
• 2 Jump-start connection
  20
• 2.1 Assembly overview - jump-start connection
  20
• 2.2 Removing and installing jump starting point
  20
• 3 Alternator
  22
• 3.1 Assembly overview - alternator
  22
• 3.2 Removing and installing alternator
  28
• 3.3 Checking alternator with voltage regulator CX1
  48
• 3.4 Repairing alternator with voltage regulator CX1
  48
• 3.5 Checking poly V-belt
  49
• 3.6 Removing and installing poly V-belt pulley
  49
• 3.7 Removing and installing voltage regulator
  54
• 4 Starter motor
  58
• 4.1 Assembly overview – starter
  58
• 4.2 Removing and installing starter
  66
• 4.3 Checking starter B
  88
• 5 Cruise control system (CCS)
  89
• 6 Start/stop system
  90
• 6.1 Components of start/stop system
  90
• 6.2 Removing and installing voltage stabiliser J532
  91
• 7 Adaptive cruise control (ACC)
  93
• 7.1 Components of adaptive cruise control
  93
• 7.2 Overview of fitting locations - adaptive cruise control
  93
• 7.3 Removing and installing adaptive cruise control button E357
  94
• 7.4 Removing and installing adaptive cruise control unit J428
  94
• 7.5 Calibrating adaptive cruise control
  95
• Gauges, instruments
  97
• 1 Dash panel insert
  97
• 1.1 Removing and installing dash panel insert K
  97
• 1.2 Multi-pin connector pin assignment on dash panel insert K
  99
• 2 Horn
  100
• 2.1 Removing and installing treble horn H2 , bass horn H7
  100
• 2.2 Removing and installing horn plate
  100
• Windscreen wash/wipe system
  101
• 1 Windscreen wiper system
  101
• 1.1 Assembly overview - windscreen wiper system
  101
• 1.2 Removing and installing wiper blade
  102
• 1.3 Removing and installing wiper arms
  102
• 1.4 Adjusting wiper arms
  104
• 1.5 Renewing windscreen wiper rubber
  105
• 1.6 Removing and installing wiper motor V
  106
• 1.7 Deactivating APP function of wiper motor
  110
• 1.8 Removing and installing rain and light sensor G397
  111
• 2 Windscreen washer system
  114
• 2.1 Assembly overview - windscreen washer system
  114
• 2.2 Removing and installing washer fluid reservoir
  116
• 2.3 Removing and installing washer pump V5 / windscreen and rear window washer pump V59
  120
• 2.4 Removing and installing windscreen washer fluid level sender G33
  121
• 2.5 Removing and installing washer jets
  122
• 2.6 Adjusting spray jets
  122
• 3 Rear window wiper system
  123
• 3.1 Assembly overview - rear window wiper system
  123
• 3.2 Removing and installing wiper blade
  123
• 3.3 Removing and installing wiper arm
  124
• 3.4 Adjusting wiper arm
  125
• 3.5 Removing and installing rear window wiper motor V12
  126
• 4 Rear window washer system
  128
• 4.1 Assembly overview - rear window washer system
  128
• 4.2 Removing and installing spray jet
  129
• 4.3 Adjusting spray jet
  129
• 5 Headlight washer system
  130
• 5.1 Assembly overview - headlight washer system
  130
• 5.2 Removing and installing headlight washer system pump V11
  131
• 5.3 Removing and installing washer jets
  132
• 5.4 Adjusting spray jets
  132
• 5.5 Removing and installing pop-up cylinder
  132
• 6 Washer fluid lines
  134
• 6.1 Repairing washer fluid lines
  134
• Lights, bulbs, switches - exterior
  135
• 1 Headlights
  135
• 1.1 Assembly overview - headlight
  135
• 1.2 Removing and installing headlights MX1 / MX2
  139
• 1.3 Adjusting headlights MX1 / MX2
  145
• 1.4 Adjusting headlight installation position
  145
• 1.5 Removing and installing front turn signal bulb M5 / M7
  147
• 1.6 Removing and installing headlight dipped beam bulb M29 / M31
  149
• 1.7 Removing and installing headlight main beam bulb M30 / M32
  151
• 1.8 Removing and installing gas discharge bulb L13 / L14
  153
• 1.9 Removing and installing bulb for daytime running light/side light M1 / M3
  155
• 1.10 Removing and installing headlight range control motor V48 / V49
  157
• 1.11 Installing repair kit for headlight housing
  161
• 1.12 Converting headlights from driving on right to driving on left
  164
• 1.13 Converting headlights from driving on left to driving on right
  166
• 1.14 Removing and installing swivel module position sensor G474 / G475
  168
• 1.15 Removing and installing dynamic cornering light control motor V318 / V319
  169
• 1.16 Removing and installing gas discharge bulb control unit J343 / J344
  169
• 1.17 Removing and installing output module for headlight J667 / J668
  170
• 2 Fog lights
  172
• 2.1 Assembly overview - fog lights
  172
• 2.2 Removing and installing fog light
  172
• 2.4 Adjusting fog lights
  174
• 3 Lights in exterior mirror
  175
• 3.1 Assembly overview - lights in exterior mirror
  175
• 3.2 Removing and installing entry light in exterior mirror W52 / W53
  175
• 4 Tail lights
  178
• 4.1 Assembly overview - tail lights in body
  178
• 4.2 Assembly overview - tail lights in rear lid
  179
• 4.3 Removing and installing tail light MX3 / MX4
  181
• 4.4 Removing and installing tail light MX5 / MX6
  185
• 4.5 Removing and installing tail light cluster bulb
  188
• 5 High-level brake light
  193
• 5.1 Removing and installing bulb for high-level brake light M25
  193
• 6 Number plate light
  197
• 6.1 Removing and installing number plate light X
  197
• 6.2 Removing and installing bulb for number plate light X
  199
• 7 Entry and start authorisation system
  200
• 7.1 Assembly overview - entry and start authorisation system
  200
• 7.4 Removing and installing interior aerial for entry and start authorisation
  209
• 7.5 Removing and installing luggage compartment aerial for entry and start authorisation R137
  214
• 7.6 Removing and installing rear bumper aerial for entry and start system R136
  215
• 7.7 Checking entry and start system aerials and sensors
  216
• 7.8 Removing and installing rear lid power opening sender G750 / G760
  217
• 8 Steering column switch module (SCSM)
  219
• 8.1 Assembly overview - steering column switch module (SCSM)
  219
• 8.2 Removing and installing steering column switch module (SCSM)
  220
• 8.3 Removing and installing steering column electronics control unit J527
  227
• 9 Parking aid
  232
• 9.1 Assembly overview – parking aid
  232
• 9.2 Removing and installing parking aid control unit J446
  233
• 9.3 Removing and installing front parking aid warning buzzer H22
  234
• 9.4 Removing and installing rear parking aid warning buzzer H15
  235
• 9.5 Adjusting volume and frequency of rear parking aid warning buzzer H15
  236
• 9.6 Removing and installing front parking aid senders G252 / G253 / G254 / G255
  236
• 9.7 Removing and installing rear parking aid senders G203 / G204 / G205 / G206
  237
• 10 Park assist steering
  238
• 10.1 Assembly overview - park assist steering
  238
• 10.2 Removing and installing park assist steering control unit J791
  239
• 10.3 Removing and installing front sender for park assist steering G568 / G569
  240
• 10.4 Removing and installing rear park assist steering sender G716 / G717
  242
• 10.5 Removing and installing front parking aid warning buzzer H22
  244
• 10.6 Removing and installing park assist steering control unit J791
  244
• 11 Automatic headlight range control
  246
• 12 Towing bracket
  247
• 12.1 Removing and installing trailer detector control unit J345
  247
• 13 Lane departure warning
  249
• 13.1 Assembly overview - lane departure warning
  249
• 13.2 General description
  249
• 13.3 Removing and installing front camera for driver assist systems R242
  250
• 13.4 Removing and installing windscreen heater for front sensors Z113
  252
• Lights, bulbs, switches - interior
  253
• 1 Lights
  253
• 1.1 Overview of fitting locations - lights in dash panel
  254
• 1.2 Overview of fitting locations - lights in front doors
  255
• 1.3 Overview of fitting locations - lights in rear doors
  256
• 1.4 Overview of fitting locations - lights in luggage compartment
  256
• 1.5 Overview of fitting locations - lights in roof trim
  259
• 1.6 Removing and installing glove compartment light W6
  259
• 1.7 Removing and installing bulb for glove compartment light W6
  261
• 1.8 Removing and installing footwell light W9 / W10
  261
• 1.9 Removing and installing footwell light bulb W9 / W10
  262
• 1.11 Removing and installing Central locking SAFELOCK function warning lamp K133
  264
• 1.12 Removing and installing entry light W31 / W32 / W33 / W34
  265
• 1.13 Removing and installing cigarette lighter illumination bulb L28
  267
• 1.14 Removing and installing luggage compartment light W3
  267
• 1.15 Removing and installing bulb for luggage compartment light W3
  269
• 1.16 Removing and installing illuminated vanity mirror W20 / W14
  269
• 1.17 Removing and installing vanity mirror light bulb L31
  270
• 1.18 Removing and installing front interior light W1
  271
• 1.19 Removing and installing centre reading light W39 / W40
  271
• 1.20 Removing and installing front interior light WX1
  271
• 1.21 Removing and installing bulbs for front interior light W1
  272
• 1.22 Removing and installing bulbs for centre reading light W39 / W40
  273
• 1.23 Removing and installing rear interior light W43
  274
• 1.24 Removing and installing rear reading light W11 / W12
  274
• 1.25 Removing and installing rear interior light WX2 , Saloon
  274
• 1.27 Removing and installing rear reading light W11 / W12 , Estate
  276
• 1.28 Removing and installing bulb for rear reading light W11 / W12 , Estate
  277
• 2 Controls
  278
• 2.1 Fitting locations overview - controls in dash panel
  279
• 2.2 Fitting locations overview - controls in front doors
  281
• 2.3 Overview of fitting locations - controls in rear doors
  282
• 2.4 Overview of fitting locations - controls in centre console
  283
• 2.5 Fitting locations overview - controls in luggage compartment
  284
• 2.6 Fitting locations overview - controls in roof trim
  286
• 2.7 Removing and installing light switch E1
  286
• 2.9 Removing and installing electronic ignition lock D9
  288
• 2.10 Removing and installing hazard warning light button E229
  291
• 2.11 Removing and installing glove compartment light switch E26
  292
• 2.12 Removing and installing key-operated switch to deactivate front passenger side airbag E224
  293
• 2.13 Removing and installing front driver side window regulator button E710
  294
• 2.15 Removing and installing front passenger side window regulator button, in driver door E715
  294
• 2.16 Removing and installing rear passenger side window regulator button, in driver door E714
  294
• 2.17 Removing and installing childproof lock button E318
  294
• 2.18 Removing and installing driver side button module
  294
• 2.19 Removing and installing mirror adjustment switch E43
  296
• 2.20 Removing and installing driver side interior locking button for central locking system E308
  297
• 2.21 Removing and installing rear lid remote release button E233
  298
• 2.22 Removing and installing window regulator switch in front passenger door E107
  299
• 2.23 Removing and installing rear window regulator button E711 / E713
  300
• 2.24 Removing and installing electromechanical parking brake button E538
  301
• 2.25 Removing and installing auto-hold button E540
  301
• 2.26 Removing and installing TCS and ESP button E256
  301
• 2.27 Removing and installing entry and start authorisation button E408
  301
• 2.28 Removing and installing shock absorber damping adjustment button E387
  301
• 2.29 Removing and installing Start/Stop operation button E693
  302
• 2.30 Removing and installing rear roller blind switch E149
  302
• 2.31 Removing and installing tyre pressure monitor display button E492
  302
• 2.32 Removing and installing parking aid button E266
  302
• 2.33 Removing and installing park assist steering button E581
  302
• 2.34 Removing and installing switch module in centre console EX23 / EX30
  302
• 2.35 Removing and installing heated rear seat switch with regulator E128 / E129
  304
• 2.37 Removing and installing luggage compartment light switch F5
  306
• 2.38 Removing and installing vanity mirror contact switch F147 / F148
  306
• 2.39 Removing and installing front interior light button E326 , reading light button E457 / E458
  307
• 2.40 Removing and installing sliding sunroof adjustment regulator E139
  307
• 2.41 Removing and installing garage door operating unit E284
  307
• 2.42 Removing and installing interior monitoring deactivation switch E267
  308
• 2.43 Removing and installing bonnet contact switch F266
  309
• 3 Immobiliser
  311
• 3.1 General description
  311
• 3.2 Removing and installing immobilizer reading unit D1
  312
• 3.3 Immobiliser control unit J362
  312
• 3.4 Ignition key
  312
• 3.5 Online system test
  313
• 4 Anti-theft alarm
  314
• 4.1 Assembly overview - anti-theft alarm system
  314
• 4.2 Activating and deactivating anti-theft alarm
  315
• 4.3 Removing and installing alarm horn H12
  316
• 4.4 Removing and installing interior monitor send and receive module 1 G303
  318
• 4.5 Removing and installing interior monitoring sensor G273
  321
• 4.6 Removing and installing vehicle inclination sender G384
  321
• 5 Lane change assist
  322
• 5.1 Removing and installing lane change assist warning lamp in exterior mirror K233 / K234
  322
• 5.2 Removing and installing lane change assist control unit J769 / J770
  323
• 5.3 Calibrating lane change assist
  324
• 5.4 Calibrating lane change assist control unit J769 / J770
  329
• 6 Cigarette lighter, sockets
  332
• 6.1 Removing and installing cigarette lighter U1
  332
• 6.2 Removing and installing DC/AC converter with socket, 12 V-230 V U13
  332
• Wiring
  335
• 1 Relay carriers, fuse holders, electronics boxes
  335
• 1.1 Removing and installing electronics box (E-box)
  335
• 1.2 Removing and installing main fuse holder in electronics box
  341
• 1.3 Removing and installing dash panel fuse holder
  341
• 1.4 Removing and installing relay and fuse holder behind dash panel on driver side
  342
• 2 Select Control units
  346
• 2.1 Removing and installing onboard supply control unit J519
  346
• 2.2 Removing and installing data bus diagnostic interface J533
  350
• 2.3 Removing and installing convenience system central control unit J393
  351
• 3 Connectors
  356
• 3.1 Repairing electrical wiring harnesses and plug-in connections
  356
• 4 Vehicle diagnosis, testing and information systems
  357