Electrical system

Chapter overview

• Technical data
  1
• 1 Battery
  1
• 1.1 Types of battery
  1
• 1.2 Battery - general notes
  1
• 1.3 Fundamental issues
  1
• Starter, current supply, CCS
  2
• 1 Battery
  2
• 1.1 Assembly overview - battery
  2
• 1.2 Removing and installing battery
  4
• 1.3 Checking battery
  7
• 1.4 Disconnecting and connecting battery
  7
• 1.5 Charging battery
  12
• 1.6 Removing and installing earth cable with battery monitor control unit J367
  12
• 1.7 Pyrotechnical battery isolator
  14
• 1.8 Adapting battery monitor control unit J367
  17
• 2 Jump start point
  18
• 2.1 Assembly overview - jump-start terminal
  18
• 2.2 Removing and installing jump starting point
  18
• 3 Starter motor
  20
• 3.1 Assembly overview - starter
  20
• 3.2 Removing and installing starter motor
  29
• 3.3 Checking starter
  55
• 4 Alternator
  56
• 4.1 Assembly overview - alternator
  56
• 4.2 Removing and installing alternator
  63
• 4.3 Checking alternator
  82
• 4.4 Checking poly V-belt
  82
• 4.5 Removing and installing poly V-belt pulley
  83
• 4.6 Removing and installing voltage regulator
  88
• 4.7 Securing B+ (battery positive) wire to alternator
  90
• 5 Start/stop system
  91
• 5.1 Components of start/stop system
  91
• 5.2 Removing and installing voltage stabiliser J532
  92
• 6 Cruise control system (CCS)
  94
• 6.1 General notes
  94
• 6.2 Activating and deactivating cruise control system (CCS)
  94
• 7 Adaptive cruise control (ACC)
  95
• 7.1 Installing adaptive cruise control
  95
• 7.2 Overview of fitting locations - adaptive cruise control
  95
• 7.3 Removing and installing adaptive cruise control unit
  96
• 7.4 Removing and installing adaptive cruise control button
  97
• 7.5 Calibrating adaptive cruise control
  97
• Gauges, instruments
  99
• 1 Dash panel insert
  99
• 1.1 General description
  99
• 1.2 Assembly overview - dash panel insert
  101
• 1.3 Removing and installing dash panel insert
  104
• 2 Clock
  106
• 2.1 Removing and installing clock
  106
• 3 Horn
  108
• 3.1 Assembly overview - horn
  108
• 3.2 Removing and installing horn
  109
• Windscreen wash/wipe system
  110
• 1 windscreen wiper system
  110
• 1.1 General description
  110
• 1.2 Assembly overview - windscreen wiper system
  110
• 1.3 Removing and installing wiper blade
  112
• 1.4 Renewing windscreen wiper rubber
  112
• 1.5 Removing and installing wiper arms
  114
• 1.6 Adjusting wiper arms
  114
• 1.7 Removing and installing wiper motor
  115
• 1.8 Removing and installing rain and light sensor
  121
• 2 Windscreen washer system
  126
• 2.1 General notes
  126
• 2.2 Assembly overview - windscreen washer system
  126
• 2.3 Removing and installing washer fluid reservoir
  128
• 2.4 Removing and installing windscreen washer pump
  132
• 2.5 Removing and installing windscreen washer fluid level sender
  133
• 2.6 Removing and installing washer jets
  133
• 2.7 Adjusting spray jets
  133
• 3 Headlight washer system
  134
• 3.1 General notes
  134
• 3.2 Assembly overview - headlight washer system
  134
• 3.3 Removing and installing headlight washer system pump
  135
• 3.4 Removing and installing washer jets
  136
• 3.5 Adjusting spray jets
  136
• 3.6 Removing and installing pop-up cylinder
  136
• 3.7 Bleeding headlight washer system
  138
• 3.8 Adapting headlight washer system
  138
• 4 Washer fluid lines
  139
• 4.1 Headlight washer system
  139
• 4.2 Hose repair
  139
• Lights, bulbs, switches - exterior
  140
• 1 Headlights
  141
• 1.1 Assembly overview - headlight
  141
• 1.2 Removing and installing headlights MX1 / MX2
  150
• 1.3 Adjusting headlights MX1 / MX2
  154
• 1.4 Adjusting headlight installation position
  154
• 1.5 Converting headlights for use when driving on the left or right
  156
• 1.6 Removing and installing headlight dipped beam bulb M29 / M31
  163
• 1.7 Removing and installing headlight main beam bulb M30 / M32
  167
• 1.8 Removing and installing static cornering light bulb
  170
• 1.9 Removing and installing side light bulb M1 / M3
  174
• 1.10 Removing and installing turn signal bulb M5 / M7
  177
• 1.11 Removing and installing headlight range control motor V48 / V49
  180
• 1.12 Headlight holder
  183
• 1.13 Repairing headlight retaining tabs
  184
• 1.14 Removing and installing gas discharge bulb
  188
• 1.15 Removing and installing bulb for daytime running light/side light
  191
• 1.16 Headlight holder
  193
• 1.17 Dip beam screen motor V294 / V295
  193
• 1.19 Cornering light and headlight range control unit J745
  195
• 1.20 Vehicle level sender
  196
• 1.21 Removing and installing control unit for daytime running light and side light J860 / J861
  197
• 2 Fog lights
  198
• 2.1 Assembly overview - fog lights
  198
• 2.2 Removing and installing fog light
  199
• 2.3 Removing and installing fog light bulb L22 / L23
  200
• 2.4 Checking fog lights
  200
• 2.5 Adjusting fog lights
  201
• 3 Side marker light
  202
• 3.1 Removing and installing side marker bulb (for USA and Canada only)
  202
• 4 Front turn signal lamp
  204
• 4.1 Removing and installing front turn signal
  204
• 4.2 Removing and installing front turn signal bulb M5 / M7
  205
• 4.3 Checking front turn signal
  206
• 5 Lights in exterior mirror
  207
• 5.1 Assembly overview - lights in exterior mirror
  207
• 5.2 Removing and installing turn signal repeater bulb L131 / L132
  207
• 5.3 Entry light in exterior mirror W52 / W53
  208
• 6 Tail lights
  211
• 6.1 General notes
  211
• 6.2 Assembly overview - tail lights in rear lid
  211
• 6.3 Assembly overview - tail lights in body
  214
• 6.4 Removing and installing tail light MX3 / MX4
  215
• 6.5 Removing and installing tail light cluster in rear lid MX5 / MX6
  221
• 6.6 Removing and installing brake and tail light bulb M21 / M22
  229
• 6.7 Removing and installing rear turn signal bulb M6 / M8
  230
• 7 High-level brake light
  232
• 7.1 General notes
  232
• 7.2 Removing and installing bulb for high-level brake light M25
  232
• 7.3 Checking high-level brake light bulb M25
  233
• 8 Number plate light
  234
• 8.1 Removing and installing number plate light X
  234
• 8.2 Checking number plate light X
  235
• 9 Steering column switch module (SCSM)
  236
• 9.1 Assembly overview - steering column switch module (SCSM)
  236
• 9.2 Removing and installing steering column switch module (SCSM)
  238
• 9.3 Removing and installing steering column electronics control unit
  243
• 9.4 Airbag coil connector and return ring with slip ring F138 ► 10.2009
  249
• 9.5 Segment sender for steering angle sender G85 ► 10.2009
  250
• 10 Ignition/starter switch and lock cylinder
  252
• 10.1 Ignition/starter switch
  252
• 10.2 Lock cylinder
  252
• 11 Parking aid
  253
• 11.1 General description
  253
• 11.2 Assembly overview - parking aid
  254
• 11.3 Removing and installing parking aid control unit
  256
• 11.4 Removing and installing front parking aid senders
  258
• 11.5 Removing and installing rear parking aid senders
  263
• 11.7 Repairing parking aid sender retainers in rear bumper cover
  267
• 11.8 Parking aid warning buzzer
  269
• 12 Park assist steering
  272
• 12.1 General description
  272
• 12.2 Assembly overview - park assist steering
  273
• 12.3 Removing and installing park assist steering control unit
  275
• 12.4 Repairing park assist steering sender retainers in front bumper cover
  276
• 12.5 Removing and installing front parking aid warning buzzer
  277
• 12.6 Removing and installing rear parking aid warning buzzer
  279
• 13 Lane departure warning (Lane Assist)
  280
• 13.1 General description
  280
• 13.2 Assembly overview - lane departure warning
  281
• 13.3 Removing and installing lane departure warning control unit
  281
• 13.4 Removing and installing windscreen heater for lane departure warning
  282
• 13.5 Calibrating lane departure warning camera
  283
• 13.6 Coding lane departure warning control unit
  283
• 14 Entry and start authorisation
  284
• 14.1 Assembly overview - entry and start authorisation aerials and sensors
  284
• 14.2 General description
  286
• 14.3 Emergency starting when communication between ID sender and control unit is defective
  288
• 14.4 Electronic ignition lock D9
  288
• 14.5 Removing and installing control unit for terminal control and engine start J942
  288
• 14.6 Convenience system central control unit J393
  289
• 14.7 Entry and start authorisation aerials and sensors
  290
• 14.8 Checking entry and start system aerials and sensors
  297
• 14.9 Removing and installing rear lid power opening sender G750 / G760
  301
• 14.10 Adapting entry and start authorisation functions
  302
• Lights, bulbs, switches - interior
  303
• 1 Lights
  303
• 1.1 Overview of fitting locations - lights in dash panel
  303
• 1.2 Overview of fitting locations - lights in front doors
  305
• 1.3 Overview of fitting locations - lights in rear doors
  306
• 1.4 Overview of fitting locations - lights in luggage compartment
  307
• 1.5 Overview of fitting locations - lights in roof trim
  308
• 1.6 Removing and installing glove compartment light W6
  308
• 1.7 Removing and installing bulb for glove compartment light W6
  309
• 1.8 Removing and installing footwell light W9 / W10
  309
• 1.9 Removing and installing footwell light bulb W9 / W10
  310
• 1.11 Central locking SAFELOCK function warning lamp K133
  312
• 1.12 Removing and installing entry light W31 / W32 / W33 / W34
  313
• 1.13 Removing and installing luggage compartment light W3
  314
• 1.14 Removing and installing bulb for luggage compartment light W3
  315
• 1.15 Removing and installing cigarette lighter illumination bulb L28
  316
• 1.16 Removing and installing illuminated vanity mirror W20 / W14
  316
• 1.17 Removing and installing vanity mirror light bulb L31
  317
• 1.18 Removing and installing front interior light WX1
  317
• 1.19 Removing and installing centre reading light W39 / W40
  320
• 1.20 Removing and installing rear interior light WX2
  321
• 1.21 Removing and installing bulb for rear reading light W11 / W12
  322
• 2 Controls
  326
• 2.1 Fitting locations overview - controls in dash panel
  327
• 2.2 Fitting locations overview - controls in front doors
  329
• 2.3 Fitting locations overview - controls in rear doors
  330
• 2.4 Fitting locations overview - controls in centre console
  331
• 2.5 Fitting locations overview - controls in luggage compartment
  332
• 2.6 Fitting locations overview - controls in roof trim
  333
• 2.7 Removing and installing light switch E1
  333
• 2.9 Removing and installing electronic ignition lock D9
  335
• 2.10 Removing and installing hazard warning light switch E3
  337
• 2.11 Removing and installing glove compartment light switch E26
  340
• 2.12 Removing and installing driver side switch module
  341
• 2.13 Removing and installing front left window regulator switch E40
  342
• 2.14 Removing and installing rear left window regulator switch in driver door E53
  342
• 2.17 Removing and installing childproof lock button E318
  343
• 2.18 Removing and installing mirror adjustment switch E43
  343
• 2.19 Removing and installing driver side interior locking button for central locking system E308
  344
• 2.20 Removing and installing rear window regulator switch E52 / E54
  345
• 2.21 Removing and installing remote release button for fuel filler flap and rear lid E463
  346
• 2.23 Removing and installing window regulator switch in front passenger door E107
  347
• 2.24 Removing and installing electromechanical parking brake button E538
  348
• 2.25 Removing and installing auto-hold button E540
  350
• 2.26 Removing and installing Tyre Pressure Monitoring System button E226
  350
• 2.27 Removing and installing TCS and ESP button E256
  350
• 2.28 Removing and installing shock absorber damping adjustment button E387
  350
• 2.29 Removing and installing rear roller blind switch E149
  350
• 2.30 Removing and installing parking aid button E266
  350
• 2.31 Removing and installing park assist steering button E581
  350
• 2.32 Removing and installing switch module in centre console EX23 / EX30
  351
• 2.33 Removing and installing luggage compartment light switch F5
  353
• 2.34 Removing and installing rear lid locking unit F256
  354
• 2.35 Removing and installing vanity mirror contact switch F147 / F148
  354
• 2.36 Removing and installing front interior light button E326 , reading light button E457 / E458
  355
• 2.37 Removing and installing rear reading light button E454 / E455
  355
• 2.39 Removing and installing bonnet contact switch F266
  356
• 2.40 Removing and installing garage door operating unit E284
  357
• 3 Immobiliser
  358
• 3.1 General description
  358
• 3.2 Immobiliser control unit J362
  359
• 3.3 Immobiliser reader unit D1
  360
• 3.4 Ignition key
  360
• 3.5 Online system test
  361
• 4 Anti-theft alarm (ATA)
  362
• 4.1 General description
  362
• 4.2 Assembly overview - anti-theft alarm (ATA)
  363
• 4.3 Activating and deactivating anti-theft alarm
  364
• 4.4 Interior monitoring sensor G273
  365
• 4.5 Interior monitor send and receive module 1 G303
  365
• 4.6 Vehicle inclination sender G384
  367
• 4.7 Central locking and anti-theft alarm system aerial R47
  367
• 4.8 Reading alarm sources of anti-theft alarm
  367
• 4.9 Adapting alarm delay on opening driver door
  368
• 4.10 Adapting sensitivity of interior monitoring system
  368
• 4.11 Adapting sensitivity of inclination sensor
  368
• 4.12 Alarm horn H12
  369
• 5 Lights and controls in front doors
  372
• 5.1 Components - front door locks
  372
• 6 Lights and controls in rear doors
  373
• 6.1 Components - rear door locks
  373
• 7 Lights and controls in the roof trim
  374
• 7.1 Automatic anti-dazzle interior mirror Y7
  374
• 8 Lights and controls in the centre console
  375
• 8.1 Removing and installing front ashtray illumination bulb
  375
• 8.2 Removing and installing cigarette lighter U1
  375
• 8.3 Removing and installing storage compartment illumination bulb L120
  375
• 8.4 Removing and installing DC/AC converter with socket, 12 V-230 V U13
  377
• 9 Lane change assist
  380
• 9.1 Removing and installing lane change assist warning lamp in exterior mirror K233 / K234
  380
• 9.2 Removing and installing lane change assist control unit J769 / J770
  381
• 9.3 Calibrating lane change assist
  382
• 9.4 Calibrating lane change assist control unit J769 / J770
  387
• Wiring
  390
• 1 Vehicle diagnosis, testing and information systems
  390
• 2 Relay carriers, fuse holders, electronics boxes
  391
• 2.1 Removing and installing fuse holder in dash panel
  391
• 2.2 Removing and installing electronics box in dash panel
  392
• 2.3 Relay carrier on left of dash panel
  393
• 2.4 Relay carrier on onboard supply control unit J519
  395
• 2.5 Removing and installing electronics box on left side of engine compartment
  396
• 2.6 Main fuse box
  400
• 3 Select Control units
  401
• 3.1 On-board supply control unit J519
  401
• 3.2 Data bus diagnostic interface J533
  407
• 3.3 Convenience system central control unit J393
  410
• 3.4 Driver door control unit J386
  416
• 3.5 Front passenger door control unit J387
  417
• 3.6 Rear left door control unit J388
  418
• 3.7 Rear right door control unit J389
  419
• 3.8 Trailer detector control unit J345
  419
• 4 Connectors
  423
• 4.1 Repairing electrical wiring harnesses and plug-in connections
  423