Do you have a question about the XC70 2012 and is the answer not in the manual?
Questions and answers
Matt
April 15, 2025
Simultaneous multiple faults that cause limp mode, no power steering and speedo doesn’t work, but then clears
1 comments:
Mr. Anderson
April 15, 2025
Simultaneous multiple faults in a 2012 Volvo XC70—such as limp mode, loss of power steering, and a non-functioning speedometer—could be caused by an issue with the vehicle's CAN (Controller Area Network) communication system or a problem in the wiring and fuses (Group 37). A failure in the CAN system can disrupt communication between critical modules, affecting engine management, steering, and instrument cluster functions.
2. Damage or malfunction of the SRS/SIPS bag/IC system. Work involving the SRS/SIPS bag/IC systems or other components in the vehicle that may affect the SRS/SIPS bag/IC systems must always be performed by an authorized Volvo workshop. In case of doubt, consult the SRS and SIPS bag/IC service manual.
Table of Contents 1:3 Control modules Vehicles with SRS (Airbag)/SIPS bag/ IC (Inflatable curtain) ............. 2 Overview locations............44 Explanations ..............6 Overview designations..........45 How to use the wiring diagrams 1:2....... 7 Central Electronic Module (CEM) 1:3 ......46 Data communication high speed CAN ......
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Table of Contents 2:3 Group 33 Starting system Group 37 Wiring and fuses Starting system 4-Cyl. Turbo ........92 Diagnostics system ............ 135 Starting system 5- & 6-Cyl........... 93 Outlet 12 V ..............136 Starting system 4-Cyl. Diesel........94 Cable harness towbar/tow hitch 4-pin V70 ....
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Table of Contents 3:3 Group 76 Shock absorbers Group 89 Body other Four-C ..............170 Radiator masking blind ..........212 Group 83 Doors and openings Connectors..........213 Central locking front doors LHD......... 171 Central locking front doors RHD ........ 172 Branching points ........248 Central locking rear doors..........
Explanations Abbreviations Groups Other Group 26 = Cooling system = Adaptive Cruise Control Group 27 = Engine controls = Silver plated Group 28 = Ignition and control system = Gold plated Group 32 = Alternator and voltage regulator AUTO = Automatic transmission Group 33 = Starting system BLIS...
How to use the wiring diagrams 1:2 The descriptions below apply in general The systems are shown in non active to all wiring diagram manuals, although status, i.e. with “key removed” and when not all sections are necessarily con- doors, hatches and hood are closed. tained in this manual.
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How to use the wiring diagrams 2:2 List of symbols = System voltage = Ground connection via wiring = Ground connection in component/chassis = Screened wire = Junction point = Twisted cable = Electrical connection = Variant = CAN communication = CAN high data signal (CAN H) = CAN low data signal (CAN L) = LIN communication...
Fuses Distribution box in engine compartment F1-F7 15/31 Distribution box in engine compartment Fuse function 11A/1 4/56 Central Electronic Module (CEM) 10/2 Lamp housing, front right relay in CEM Fuse in the Central Electronic Module (CEM) relay in CEM F9-F11 Fuses in the Central Electronic Module (CEM) relay in CEM Fuse in the Central Electronic Module (CEM)
Fuses Distribution box in engine compartment F8-F21 15/31 Distribution box in engine compartment Fuse function 11B/8 2/182 Relay, headlight washer motor 6/104 Washer motor headlights 2/182 11B/9 Wiper Motor Module (WMM) 11B/10 Combustion Preheater Module (CPM) 4/106 Control module, remote parking heater start 11B/11 4/31 Passenger compartment fan control module...
Fuses Distribution box in engine compartment F32-F37 15/31 Distribution box in engine compartment Fuse function 11B/32 Electromagnetic clutch, climate control system 2/22 11B/33 2/22 Relay, climate control system 2/239 Relay coolant pump. 11B/34 6/25 Starter motor 2/35 4/46 Engine Control Module (ECM) 2/35 11B/35 4/109...
Fuses Distribution box in engine compartment F39-F44 15/31 Distribution box in engine compartment Fuse function 11B/39 7/15 Front oxygen sensor, bank 1, 6-Cyl. 7/82 Rear oxygen sensor, bank 1, 6-Cyl. 7/103 Front heated oxygen sensor bank 2, 6-Cyl. W/O T 7/104 Rear heated oxygen sensor bank 2, 6-Cyl.
Fuses Distribution box in passenger compartment F18 - F22 15/36 Distribution box in passenger compartment Fuse function 11C/18 3/281 Infotainment Control Module (ICM) 4/124 Accessory USB unit (AUU) 16/1 Integrated Audio Module (IAM) 16/159 Control module, cellular phone handsfree 11/1 Fuse in extra fuse holder, passenger compartment 11C/19 16/60...
Fuses Distribution box in passenger compartment F25 - F30 15/36 Distribution box in passenger compartment Fuse function 11C/25 2/141 Refrigeration box relay 4/131 Control module back massage left 4/133 Control module back massage right 10/276 Lighting center armrest rear 1 10/277 Lighting center armrest rear 2 10/280...
Fuses Distribution box in engine compartment, cold zone F10 F11 F12 2/246 2/166 15/37 I013222 15/37 Distribution box cold zone in engine compartment, Start/Stop function Fuse function 11A/1 9/42 PTC-element 11A/2 4/56C5:1 Central Electronic Module (CEM) 11A/3 2/88 Relay, 15-feed rear 11C/23-11C/30 Fuses in distribution box passenger compartment 2/88...
Fuses Battery PF1-PF2 1/1 Battery Fuse function 11A/1-11A/7 Fuses in the engine compartment distribution box 11B/8-11B/14 Fuses in the engine compartment distribution box 11B/16-11B/22 Fuses in the engine compartment distribution box 2/31 11B/23 Fuses in the engine compartment distribution box 11B/27-11B/32 Fuses in the engine compartment distribution box 11B/33...
Control modules Overview designations Unit Designation Unit Designation 6/26 Alternator Control Module (ACM) 4/115 Park Brake Module (PBM) 7/159 Air Quality Sensor (AQS) 3/127 Passenger Door Module (PDM) 16/105 Audio module (AUD) 16/60 Phone Module (PHM) 4/16 Brake Control Module (BCM) 4/52 Power Seat Module (PSM) Climate control module (CCM)
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Connector 74/504:49-57 - 74/504B 74/504 57-pin natural Engine compartment harness Floor harness 4/16C1:22 Brake Control Module (BCM) VT-BN 7/164:4 Body Sensor Cluster VT-BN Stability Sensor (BSC) 4/16C1:29 Brake Control Module (BCM) 7/164:1 Body Sensor Cluster GN-BU GN-BU Stability Sensor (BSC) 73/3019 Branching point GY-OG...
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Connector 74/507:1-22 74/507 26-pin black Harness front door, left Floor harness 3/126C2:3 Driver Door Module (DDM) 73/5005 Branching point GY-OG GY-OG 3/127C2:3 Passenger Door Module (PDM) 3/126C2:15 Driver Door Module (DDM) VT-OG 73/5006 Branching point VT-OG 3/127C2:15 Passenger Door Module (PDM) 6/36:4 Lock motor, central locking, LH 4/56C2:11...
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Connector 74/507:23-26 - 74/508:1-19 74/507 26-pin black Harness front door, left Floor harness 16/4.2:2 Left-hand front door speaker 74/407:1 Connector GY-BK GY-BK 73/5079 Branching point 7/208:1 Pressure sensor front door left 4/9C1:57 Supplemental restraint YE-RD YE-RD system module (SRS) 7/208:2 Pressure sensor front door left VT-OG 4/9C1:58...
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Connector 74/508:20-26 - 74/509 74/508 26-pin black Harness front door, right Floor harness 3/127C1:13 Passenger Door Module 73/5023 Branching point BK-GN BK-GN (PDM), LHD 73/5024 Branching point, LHD 73/5037 Branching point, RHD 3/126C1:2 Driver Door Module (DDM), VT-RD 11C/8:2 Fuses in distribution box VT-RD passenger compartment 3/127C1:2...
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Connector 74/510 - 74/511:1-11 74/510 16-pin black Harness rear door right Floor harness 3/129:2 Right rear door module (RDM) 11C/10:2 Fuse in distribution box YE-RD YE-RD passenger compartment 3/129:13 Right rear door module (RDM) BK-GN 73/5023 Branching point BK-GN 73/5025 Branching point 16/5:1 Right-hand rear door speaker...
Cable harness routing in vehicle Harness front door, left 73/5024 I05206 Cable harness routing in vehicle Harness front door, right TP 39217202 XC70(08-) & S80(07-) 2012...
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Component illustrations 3/6 - 3/35 Switch, hazard warning flashers 3/21 Power window switch, right rear door Switch, heated rear window/rearview mirrors 3/25 Power sunroof switch Contact brake light 3/26 Switch unit, power driver’s seat 3/10 Reversing light contact 3/27 Switch unit, power passenger seat 3/19 Power window switch, rear left door 3/35...
Page 291
Component illustrations 3/35 - 3/85 3/35 Trunk handle switch, S80 3/78 Lock unit, tailgate V70 3/80 Switch, central locking system, driver’s door 3/37 Contact horn 3/82 Switch, central locking system, passenger door 3/60 Switch, auxiliary lights 3/83 Switch, passenger door power window 3/62 Hood alarm contact...
Page 292
Component illustrations 3/86 - 3/129 3/86 Power window switch, right rear door 3/117 Switch unit, ceiling light 3/93 Contact, driver’s seat belt buckle 3/126 Driver Door Module (DDM) 3/94 Contact, passenger seat belt buckle 3/127 Passenger Door Module (PDM) 3/111 Light Switch Module (LSM) 3/128 Left rear door module (LDM) 3/112 Climate control system 3/129 Right rear door module (RDM)
Page 293
Component illustrations 3/130 - 3/218 3/130 Steering Wheel Module (SWM) 3/157 Switch, passenger side airbag 3/131 Steering wheel switch right (SWSR) 3/173 Switch, trunk lid/tailgate private lock 3/132 Start Control Module (SCU) 3/176 Power window switches, driver’s door 3/135 RTI switch 3/217 Contact, LH rear belt buckle 3/156 Gear Selector Module (GSM) 3/218 Contact, center rear belt buckle...
Page 294
Component illustrations 3/219 - 3/275 3/219 Contact, RH rear belt buckle 3/271 Contact, immobilizer, clutch pedal 3/225 Switch unit, Continuously Controlled Damping (CCD) 3/272 Switch, parking brake 3/255 Position sensor, driver’s seat 3/273 Lock contact, LH front door 3/256 Position sensor, passenger seat 3/274 Lock contact, RH front door 3/267 Switch unit, telematics 3/275 Lock contact, LH rear door...
Page 299
Component illustrations 4/110 - 5/1 4/120 Parking Assistance Camera module (PAC) 4/110 Trailer Module (TRM) 4/115 Park Brake Module (PBM) 4/124 Accessory USB unit (AUU) 4/116 Power Operated Tailgate Module (POT), V70 4/131 Control module back massage left 4/119 Remote Keyless Entry (TRX) 4/133 Control module back massage right 4/119.2...
Page 300
Component illustrations 6/1 - 6/28 Wiper Motor Module (WMM) 6/19 Driver seat motor, forward/backward 6/20 Passenger seat motor, forward/backward Central locking motor, trunk lid 6/16 Driver seat motor, backrest angle 6/25 Starter motor 6/17 Driver seat motor, up/down front edge 6/26 Alternator Control Module (ACM) 6/18...
Page 301
Component illustrations 6/32 - 6/56 6/38 Left-hand headlight level adjustment motor 6/32 Rear window wiper motor, V70 6/39 Right-hand headlight level adjustment motor 6/33 Fuel pump 6/48 Damper Motor Module (DMM), recirculation 6/35 Fuel pump, auxiliary heater 6/36 Lock motor, central locking, LH front 6/55 Lock motor, central locking, RH front door...
Page 302
Component illustrations 6/57 - 6/73 6/57 Lock motor, central locking, LH rear door 6/62 Power door mirror, left 6/58 Motor, front driver’s door power window 6/63 Power door mirror, right 6/59 Motor, rear left power window 6/67 Pump, fuel leakage control 6/60 Motor, front passenger door power 6/71...
Page 303
Component illustrations 6/95 - 6/120 6/95 Damper Motor Module (DMM), 6/104 High pressure headlight washer temperature, left side motor 6/96 Damper Motor Module (DMM), temperature, right side 6/114 Vacuum pump 6/99 Engine EGR, 4-Cyl. Diesel 6/120 Throttle unit, 4-Cyl. 6/102 Damper Motor Module (DMM), defroster 6/120 Throttle unit, 5-Cyl.
Page 304
Component illustrations 6/120 - 6/164 6/120 Throttle unit, Diesel 6/142 Motor folding head restraint right 6/142 I06208 6/127 Washer motor 6/146 Lock motor, rear left brake disc 6/139 Upper actuating motor, intake manifold 6/147 Lock motor, rear right brake disc 6/140 Lower actuating motor, intake manifold 6/149...
Page 305
Component illustrations 6/165 - 7/15 6/165 Motor tailgate opening left Oil pressure monitor 6/165 I03169 Pressure sensor, climate control system 6/169 Left pump back massage 7/12 Solar sensor, twilight sensor and indicator alarm 6/170 Right pump back massage Brake fluid level sensor 7/15 Front heated oxygen sensor, 4-Cyl.
Page 306
Component illustrations 7/15 - 7/31 7/15 Front oxygen sensor, bank 1, 6-Cyl. 7/24 Front knock sensor 7/15 Front heated oxygen sensor, Diesel 7/25 Impulse sensor, 4-Cyl. 7/16 Sensor, coolant temperature 7/25 Impulse sensor, 5-Cyl. & Diesel 7/17 Mass airflow sensor (MAF) 7/25 Impulse sensor, 6-Cyl.
Page 323
Component illustrations 9/24 - 10/1 9/24 Refrigeration box 9/39 Heating element camera 9/25 Rear 12V outlet 9/42 PTC-element 9/30 Auxiliary heater 9/43 Heated windshield washer nozzle, left 9/44 Heated windshield washer nozzle, right 9/32 PTC resistor, crankcase ventilation 9/38 Electrically heated fuel filter 10/1 Lamp housing, front left TP 39217202 XC70(08-) &...
Page 324
Component illustrations 10/2 - 10/15 10/2 Lamp housing, front right 10/11 Front left running/parking light 10/3 License plate lighting, V70 10/12 Front right running/parking light 10/3 License plate lighting, S80 10/13 Front left direction indicator 10/5 Fog light, front left 10/14 Front right direction indicator 10/15 Direction indicator rear-view mirror left...
Page 328
Component illustrations 10/54 - 10/70 10/54 Direction indicator, left rear, V70 10/65 Auxiliary light, front right 10/54 Direction indicator, rear left, S80 10/66 Right-hand low beam 10/55 Reversing light left, V70 10/68 Left-hand high beam 10/55 Reversing light left, S80 10/69 Auxiliary light, front left 10/64 Right-hand high beam 10/70 Left-hand low beam...
Page 329
Component illustrations 10/72 - 10/148 10/127 Lighting, cargo compartment, left- hand side, V70 10/72 Front ashtray lighting 10/127 Lighting, cargo compartment, left- hand side, S80 10/114 Left-hand vanity mirror lighting 10/128 Lighting, cargo compartment, right- hand side, V70 10/115 Right-hand vanity mirror lighting 10/128 Lighting, cargo compartment, right- hand side, S80 10/125 Left-hand front courtesy lighting...
Page 330
Component illustrations 10/149 - 10/281 10/252 Sill lighting, rear passenger side, 10/149 Lighting, right front door mirror 10/150 Rear reading light 10/276 Lighting center armrest rear 1 10/249 Sill lighting, front driver’s side 10/277 Lighting center armrest rear 2 10/250 Sill lighting, front passenger side 10/280 Lighting cooler compartment left 10/251 Sill lighting, rear driver’s side, S80 10/281 Lighting cooler compartment right...
Page 331
Component illustrations 10/282 - 11D/A 10/282 Lighting door compartment front left 10/287 Lighting floor passenger side 10/283 Lighting door compartment front 11A/no. Main fuses in the engine right compartment fuse box 11B/no. Fuses in the engine compartment fuse box 10/284 Lighting door compartment rear left 10/285 Lighting door compartment rear 11C/no.Fuses in distribution box passenger right...
Page 332
Component illustrations 11/no. - 16/6 11/no. Fuse in extra fuse holder, passenger compartment 16/1 Integrated Audio Module (IAM) 15/31 Distribution box in engine compartment 16/3 Right-hand front door speaker 15/32 Distribution box in cargo compartment 16/4 Left-hand front door speaker 15/36 Distribution box in passenger compartment 16/5...
Page 333
Component illustrations 16/10 - 16/47 16/10 Horn 1 16/30 Loudspeaker mid-range right front 16/30 I05115 16/11 Horn 2 16/35 Siren Control Module (SCM) 16/16 Window antenna amplifier 16/36 TV receiver 16/26 Center dashboard speaker 16/45 Portable navigation system 16/29 Loudspeaker mid-range left front 16/47 Antenna GSM/GPS/RDAR 16/29 I05116...
Index 1:2 Data communication Intermediate speed CAN ... 51 Data communication MOST ........55 Abbreviations ..............6 Data communication, LIN ..........53 Accessory USB unit (AUU) ........143 Diagnostics system ........... 135 Active headlight ............115 Differential Electronic Module (DEM) ......
List of components 1:7 Battery 3/156 Gear Selector Module (GSM) 3/157 Switch, passenger side airbag 2/14 Relay, glow plug system 3/173 Switch, trunk lid/tailgate private lock 2/16 Rear window wiper relay, V70 3/176 Power window switches, driver’s door 2/17 Relay, horn 3/217 Contact, LH rear belt buckle 2/22...
Page 352
List of components 2:7 4/102 Steering Column Lock Module (SCL) 6/120 Throttle unit, 5-Cyl. 4/106 Control module, remote parking heater start 6/120 Throttle unit, 6-Cyl. 4/109 Glow plug control module 6/120 Throttle unit, Diesel 4/110 Trailer Module (TRM) 6/127 Washer motor 4/115 Park Brake Module (PBM) 6/139...
Page 353
List of components 3:7 7/103 Rear heated oxygen sensor, 5-Cyl. 7/174 Differential pressure sensor, particle filter 7/103 Front oxygen sensor, bank 2, 6-Cyl. 7/175 Occupant weight sensor, seat belt reminder 7/104 Rear oxygen sensor, bank 2, 6-Cyl. 7/178 Front impact sensor, right 7/108 Left-hand rear side impact sensor 7/179...
Page 354
List of components 4:7 8/51 Igniter side airbag front driver’s seat 9/13 Seat Heating Module (SHM), passenger side 8/52 Igniter side airbag front passenger seat 9/14 Control module, rear left seat heater 8/55 Igniter, rear left belt tensioner 9/15 Control module, RH rear seat heater 8/56 Igniter, rear right belt tensioner 9/16...
Page 355
List of components 5:7 10/50 Brake light, left, V70 15/31 Distribution box in engine compartment 10/50 Brake light left, S80 15/32 Distribution box in cargo compartment 10/51 Tail lamp 1 left, V70 15/36 Distribution box in passenger compartment 10/51 Tail lamp 1 left, S80 15/37 Distribution box cold zone in engine 10/52...
Page 356
List of components 6:7 17/13 Data link connector 31/1 Ground connection, PTC 17/19 12 V outlet, cargo compartment, V70 31/2 Ground connection, Left wheel housing 17/19 12 V outlet, cargo compartment, S80 31/3 Ground connection, Body battery 17/37 4-pin outlet, tow hitch cable harness 31/4 Ground connection, engine 17/38...
Page 358
List of components 1:7 Battery 3/156 Gear Selector Module (GSM) 3/157 Switch, passenger side airbag 2/14 Relay, glow plug system 3/173 Switch, trunk lid/tailgate private lock 2/16 Rear window wiper relay, V70 3/176 Power window switches, driver’s door 2/17 Relay, horn 3/217 Contact, LH rear belt buckle 2/22...
Page 359
List of components 2:7 4/102 Steering Column Lock Module (SCL) 6/120 Throttle unit, 5-Cyl. 4/106 Control module, remote parking heater start 6/120 Throttle unit, 6-Cyl. 4/109 Glow plug control module 6/120 Throttle unit, Diesel 4/110 Trailer Module (TRM) 6/127 Washer motor 4/115 Park Brake Module (PBM) 6/139...
Page 360
List of components 3:7 7/103 Rear heated oxygen sensor, 5-Cyl. 7/174 Differential pressure sensor, particle filter 7/103 Front oxygen sensor, bank 2, 6-Cyl. 7/175 Occupant weight sensor, seat belt reminder 7/104 Rear oxygen sensor, bank 2, 6-Cyl. 7/178 Front impact sensor, right 7/108 Left-hand rear side impact sensor 7/179...
Page 361
List of components 4:7 8/51 Igniter side airbag front driver’s seat 9/13 Seat Heating Module (SHM), passenger side 8/52 Igniter side airbag front passenger seat 9/14 Control module, rear left seat heater 8/55 Igniter, rear left belt tensioner 9/15 Control module, RH rear seat heater 8/56 Igniter, rear right belt tensioner 9/16...
Page 362
List of components 5:7 10/50 Brake light, left, V70 15/31 Distribution box in engine compartment 10/50 Brake light left, S80 15/32 Distribution box in cargo compartment 10/51 Tail lamp 1 left, V70 15/36 Distribution box in passenger compartment 10/51 Tail lamp 1 left, S80 15/37 Distribution box cold zone in engine 10/52...
Page 363
List of components 6:7 17/13 Data link connector 31/1 Ground connection, PTC 17/19 12 V outlet, cargo compartment, V70 31/2 Ground connection, Left wheel housing 17/19 12 V outlet, cargo compartment, S80 31/3 Ground connection, Body battery 17/37 4-pin outlet, tow hitch cable harness 31/4 Ground connection, engine 17/38...
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Do you have a question about the XC70 2012 and is the answer not in the manual?
Questions and answers
Simultaneous multiple faults that cause limp mode, no power steering and speedo doesn’t work, but then clears
Simultaneous multiple faults in a 2012 Volvo XC70—such as limp mode, loss of power steering, and a non-functioning speedometer—could be caused by an issue with the vehicle's CAN (Controller Area Network) communication system or a problem in the wiring and fuses (Group 37). A failure in the CAN system can disrupt communication between critical modules, affecting engine management, steering, and instrument cluster functions.
This answer is automatically generated