2008 S40 Trunk Malfunction
 

Hey guys, I'm a 2008 S40 owner. These days I encountered a trunk malfunction: it won't open anymore. Here I'm gonna share all I learned during these days.

So, if you encountered a trunk malfunction, please follow this checklist:

1. Is the trunk's button switch broken?
=If so, buy a button switch from Volvo retailers and replace it. Use screw drivers to undo the button column over the number plate and then replace it.
Here is exactly an example of solving this kind of trunk malfunction: =If not, proceed to the next item

2. Is the trunk's wiring hardness broken? Because S40's trunk wiring hardness would bends 180 degrees when you close the trunk, after a few years it would be broken.
=If so, consult your owner's manual and check your car if it's U.S. model or not. If it's U.S. model, it would be equipped with an emergency latch inside the trunk lid, you will be able to open the trunk temporarily by using this way, and then proceed to replace the wiring hardness.
Here is an example: =If not, proceed to the next item

3. Fuse malfunction caused the trunk won't open
=If so, Consult your owner's manual, and the fuse compartment is located in front of the right front seat. Follow the manual's guide to unlock the compartment and check the fuse for Trunk (which is No. 77 item in the compartment). If the fuse is blown, congratulations this is the easiest problem that can cause the trunk malfunction, you can buy a new fuse and replace the blown one.
While actually I don't think this would be possible. Because the circuits for trunk related electrics won't really be overloaded...
=If not, then you don't have any other item to turn to.

Why?

Because if your beloved S40 is not a U.S. model car, and your trunk cannot be opened, you will have no solutions to open it, not to mention to fix the malfunction. For many other cars, they all have manual ways to open the trunk if the electric one is broken. But here in Volvo S40, wow, the designer rely everything of trunk release switch on the electrics, and the electrics are so unreliable to withstand the metal fatigue!

If you are in the same situation as me, I would say, the mechanics in Volvo distributors have told me that in this case the only way out will be cutting and breaking the whole trunk lid and trunk lock from inside and then replace them all. I won't do something like that, it's pretty heartbreaking to do so. I will leave it there.

So, hope you guys won't encounter the same thing, and replace your trunk's wiring hardness on a regular basis before it finally went down. And also, try to install an emergency latch if your S40 is not U.S. model.

Thanks for reading and hope everything goes fine with you.

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You say to use the key to release the trunk? Just where does the key go in?
I've had my car for about 8 months and had a wire in the harness broken - fixed it and it worked for a short time.. but now it's not working again....
Unfortunately, there is No Pull Cord/ Emergency Release Cord.
I had to climb in the trunk and unbolt the lock to get the trunk open.. but am not quite sure what the problem is now?
So I got a Bungy Cord holding the trunk closed for now.
I have a 2009 S-40. the Specs for Fuse #77 say:
77 12-volt socket in cargo area; auxiliary equipment control module (AEM) 15A
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Manufacturer: Volvo Geely Sweden Volvo Geely Sweden
Brand: Volvo
Model: S40
Year: 2009
Engine: 2.4L In-Line B5244S4
Trim 718-2.4i
Engine 1617-5 Cyl 2.4 L GAS
Body
NumDoors 4
BodyType Sedan

YV1MS382692459404
General Information
MFR Model CodeS40 2.4I A
Body Type 4dr Car
Pass Doors 4
Alternative Name
Alternative Body 4dr Car
Drivetrain Front Wheel Drive
Original Pricing MSRP$28,550.00
Invoice$24,158.00
Destination Charge $795.00
Engine & Powertrain
Type5 Cylinder Engine
Displacement L/CI/
Fuel Type Gasoline Fuel
Horsepower 168.0 @ 6000
Fuel Economy20.0 City / 31.0 Highway MPG
Fuel Capacity15.0 gal
Net Torque170.0 @ 4400
Tech Specs
Manufactured BySweden Passenger Cars
Suspension Type - FrontMacPherson Strut
Suspension Type - RearMulti-Link
Front Tire SizeP205/50R17, P205/55R16
Rear Tire SizeP205/50R17, P205/55R16
Brake ABS System4-wheel
Wheelbase103.9 in 103.9 min 103.9 max
__________________________________________________ ______________



Fuses list with amperage Note: Fuses 1-18 are relays/circuit breakers and should only be replaced by an specialized technician.
Number Description Amperage
1 Coolant fan (radiator) 50A
2 Power steering 80A
3 Feed to passenger compartment fuse box 60A
4 Feed to passenger compartment fuse box 60A
5 Element; climate unit 80A
6 Not in use
7 ABS pump 30A
8 ABS valves 20A
9 Engine control module (ECM) 30A
10 Climate system blower 40A
11 Headlight washers 20A
12 Feed to heated rear window 30A
13 Starter motor relay 30A
14 Trailer connector 40A
15 Not in use
16 Feed to audio system 30A
17 Windshield wipers 30A
18 Feed to passenger compartment fuse box 40A
19 Not in use
20 Horn 15A
21 Not in use
22 Not in use
23 Engine control module (ECM)/transmission control module (TCM) 10A
24 Not in use
25 Not in use
26 Ignition switch 15A
27 A/C compressor; water shut-off valve 10A
28 Not in use
29 Front fog lights (option) 15A
30 Engine control module (ECM) 3A
31 Generator voltage regulator 10A
32 Fuel injectors 10A
33 Heated oxygen sensor; vacuum pump 20A
34 Ignition coils; engine control module; climate unit pressure sensor 10A
35 Engine sensor valves; A/C relay; relay coil water shut-off valve 15A
36 Engine control module (ECM); throttle sensor 10A
37 Not in use
38 Not in use
39 Not in use
40 Not in use
41 Not in use
42 Not in use
43 Audio system; Volvo Navigation system (option); 15A
44 Supplemental Restrain System (SRS) 10A
45 12-volt socket in rear seat 15A
46 Lighting – glove compartment; instrument panel; and footwells 5A
47 Interior lighting 5A
48 Tailgate wiper/washers; Windshield washers 15A
49 Supplemental Restrain System (SRS); Occupant Weight Sensor (OWS) 10A
50 Not in use
51 Park assist (until 2007); AWD; Bi-Xenon headlights (2007 only); fuel filter relay (from 2008) 10A
52 Transmission control module (TCM); 5A
53 ABS; power steering; Bi-Xenon headlights (up to 2006) 10A
54 Engine control module and turbo; ECM (until 2007); Park assist (from 2008); Bi-Xenon headlights (from 2008) 10A
55 Not in use
56 Alarm siren control module; Volvo Navigation System Remote Control (2008 on) 10A
57 On-board diagnostic socket; brake light switch; 15A
58 Right high beam; auxiliary lights relay; 7.5A
59 Left high beam 7.5A
60 Heated driver’s seat (option) 15A
61 Heated passenger’s seat (option) 15A
62 Moonroof (option) 20A
63 Power window and door lock – rear passenger’s side door 20A
64 Audio system; Volvo Navigation system (option); 5A
65 Audio system; 5A
66 Audio system control module (ICM); climate system; 10A
67 Not in use
68 Cruise control 5A
69 Climate system; rain sensor (option) 5A
70 Not in use
71 Not in use
72 Not in use
73 Moonroof; front ceiling lighting; auto-dim mirror; seat belt reminder 5A
74 Fuel pump relay 15A
75 Not in use
76 Not in use
77 12-volt socket in cargo area; auxiliary equipment control module (AEM) 15A
78 Not in use
79 Back-up lights 5A
80 Not in use
81 Power window and door lock – rear driver’s side door 20A
82 Power window and door lock – front passenger’s side door 25A
83 Power window and door lock – front driver’s side door 25A
84 Power passenger’s seat 25A
85 Power driver’s seat 25A
86 Interior lighting relay; cargo compartment light; power seats
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ENGINE COMPARTMENT FUSES
№ A Protected Component
1 50 Cooling Fan Control Modul
2 80 Electrical Power Steering Module (EPS)
3 60 Сomfort Relay (R18), Central Electronic Module (CEM), Fuse №: 45, 48, 49, 60, 61, 62, 63, 68, 69, 80 (2008-2013), 84, 85
4 60 High Beam Relay, Reverse Interlock Solenoid (Manual Transmission - 2004), Central Electronic Module (CEM), Fuse №: 55, 58, 59, 74, 77
5 80 PTC Element
6 60 Diesel (2004-2005): Glow Plug Control Module
60 Diesel 4-Cyl.: Glow Plug
70 Diesel 5-Cyl.: Glow Plug Control Module
7 30 2006-2012: Brake Control Module (BCM) (Pump)
40 2013: Brake Control Module (BCM) (Pump)
8 20 Brake Control Module (BCM) (Valves)
9 30 Main Relay (Engine Management System), Fuse №: 32, 33, 34, 35, 36
10 40 Fan Control Module
11 20 C30, S40, V50: Headlight Washer Motor Relay, High Pressure Headlight Washer Pump
20 С70: Convertible Roof Module (CRM), Headlight Washer Motor Relay, High Pressure Headlight Washer Pump
12 30 Heated Rear Window Relay, Heated Rear Window
13 30 Starter Motor
14 40 Trailer Module (TRM), 13-pin Outlet (Tow Hitch Cable Harnes)
15 30 С70: Convertible Roof Module (CRM)
16 30 C30, S40, V50: Infotainment Relay, Audio Module (AUD), Fuse №: 22, 43, 64, 65, 66, 67
40 С70: Infotainment Relay, Audio Module (AUD), Fuse №: 22, 43, 64, 65, 66, 67
17 30 Wiper Motor Module (WMM)
18 40 Reversing Light Relay, Interior Lighting Relay, Central Electronic Module (CEM), Fuse №: 46, 47, 56, 57, 79, 81, 82, 83, 86
19 - -
20 15 Horn Relay, Horn 1 & 2
21 20 Combustion Preheater Module (CPM)
22 15 2005: Subwoofer Module (SUB)
25 2006-2011: Subwoofer Module (SUB)
20 2011-2013: Subwoofer Module (SUB)
25 С70: Subwoofer Module (SUB)
23 10 Transmission Control Module (TCM), Engine Control Module (ECM (5-Cyl.))
15 6-speed PowerShift - MPS6 (2009-2013): Transmission Control Module (TCM)
24 20 Diesel: PTC-Resistor - Crankcase Ventilation (5-Cyl. - 2006-2013), Electrically Heated Fuel Filter
25 10 2010-: Secondary Battery (1.6l Diesel), Central Electronic Module (CEM (1.6l Diesel))
26 15 Starter Motor Relay, Start Control Module (SCU), Engine Control Module (2004-2005), Central Electronic Module (CEM), Fuse №: 44, 51, 52, 53, 54, 73 and Fuse in Holder
27 10 Electromagnetic Clutch (Climate Control System)
28 10 2005: Climate Control Module (CCM), Multimedia Module (MMM)
29 15 Front Fog Lights Relay, Front Left/Right Fog Light
30 3 Diesel 4-Cyl.: Engine control module (ECM (2.0l Diesel, 1.6l Petrol))
10 2010-2013: Coolant Pump (1.6l Diesel)
31 10 2004-2005 (Diesel): Alternator (Voltage Regulator)
10 2006-2013 (4-Cyl.): Alternator (Voltage Regulator)
32 10 Petrol (2004): Injectors
10 2005: Fuel Filter Pre-Heater Relay, Front Heated Oxygen Sensor, Injectors (Petrol), Valve Coolant
10 2006-2013: Mass Airflow Sensor (MAF) (5-Cyl. Diesel), Regulator Motor (Turbo), Front Heated Oxygen Sensor (4-Cyl.), Rear Heated Oxygen Sensor (4-Cyl.), Injection Valves (5-Cyl.), Coolant Valve (4-Cyl. 2.0L Diesel), Rear Heated Oxygen Sensor (4-Cyl. 1.6L Diesel (2007)), Glow Plug System Relay (2008-2013), Intercooler Bypass Valve (1.6l Diesel), Fuel Flow Control Valve (2011)
33 20 2004: Fuel Filter Pre-Heater Relay (Diesel), Vacuum Pump, Front/Rear Heated Oxygen Sensor
20 2005: Vacuum Pump, Front/Rear/Middle Heated Oxygen Sensor
20 2006-2013: Vacuum Pump Switch, Engine Control Module (ECM (5-Cyl. Diesel)), Vacuum Pump (5-Cyl.), Front Heated Oxygen Sensor (5-Cyl.), Rear Heated Oxygen Sensor (5-Cyl.), Center Heated Oxygen Sensor (5-Cyl. without Turbo), PTC-Resistor - Crankcase Ventilation (4-Cyl. 2.0L), Heated Fuel Filter (Diesel), Vacuum Pump Relay (2010-2013)
34 10 2004: Engine Control Module (ECM), Fuel Volume Control Valve (Diesel), Fuel Pressure Control Valve (Diesel), Spark Plug and Ignition Coil
10 2005: Engine Control Module (ECM - 5-Cyl.), Injection Valves, Injector, Fuel Volume Control Valve (Diesel), Spark Plug and Ignition Coil, Transformer - Ignition Coils, PTC Resistor - Oil Trap
10 2006-2013: EGR Valve, Fuel Pressure Control Valve (2006-2007), Spark Plug and Ignition Coil, EGR Cooling Bypass Valve (2006-2008), Fuel Pressure Bypass Valve (Man), Injection Valves (1.6l), Fuel Volume Control Valve (4-Cyl. 2.0l Diesel), Fuel Flow Control Valve (4-Cyl. 1.6l Diesel), Pressure Monitor (Climate Control System (5-Cyl.)), Ignition Coils (Transformer (1.6l)), Glow Plug Control Module (GCU (5-Cyl. Diesel - 2008-)), EGR Valve (5-Cyl. Diesel - 2008-2013), Starter Motor Relay (1.6l Diesel - 2010-2013), Battery Relay (1.6l Diesel - 2010-2013), Secondary Battery Relay (1.6l Diesel - 2010-2013), Coolant Pump Relay (1.6l Diesel - 2010-2013), Engine Control Module (1.6l Diesel - 2010-2013), Front Heated Oxygen Sensor (4-Cyl. - 2011-2013)
35 10 2004 (E.E.): Climate Control System Relay, Fuel Leakage Control Pump, Mass Airflow Sensor (MAF), EVAP Valve, Intake Variable Valve Timing Solenoid, Turbocharger Control Valve, Variable Valve Timing Outlet Solenoid, Bypass Valve (Diesel), Variable Turbo Geometry Solenoid (Diesel), Expansion Tank Cut-off Valve (Diesel), Intake Control Valve (Diesel), PTC Resistor - Oil Trap
15 2004 (L.E.): Climate Control System Relay, Fuel Leakage Control Pump, Mass Airflow Sensor (MAF), EVAP Valve, Intake Variable Valve Timing Solenoid, Turbocharger Control Valve, Variable Valve Timing Outlet Solenoid, Bypass Valve (Diesel), Variable Turbo Geometry Solenoid (Diesel), Expansion Tank Cut-off Valve (Diesel), Intake Control Valve (Diesel), PTC Resistor - Oil Trap
15 2005: Climate Control System Relay, Fuel Leakage Control Pump, Engine EGR, Mass Airflow Sensor (MAF), Water Detection Sensor, Injection Valves, EVAP Valve, Intake Variable Valve Timing Solenoid, Turbocharger Control Valve, Power Steering Pressure Switch, Variable Valve Timing Outlet Solenoid, Bypass Valve (Diesel), Variable Turbo Geometry Solenoid (Diesel), Intake Valve Mixing Air/Fuel Control Valve (Diesel), PTC-Resistor Air Preheating
15 2006-2007: Climate Control System Relay, Fuel Leakage Control Pump, Engine EGR (1.6l Diesel - 2006-2011), Mass Airflow Sensor (MAF), Water Detection Sensor, Injection Valves, EVAP Valve, Intake Variable Valve Timing Solenoid, Turbocharger Control Valve, Power Steering Pressure Monitor, Variable Valve Timing Outlet Solenoid, Control Valve Inlet, Variable Turbo Geometry Solenoid (4-Cyl. Diesel), Valve Mixing Air/Fuel (5-Cyl. 1.8l & 2.0l), Engine Control Module (5-Cyl. Diesel), Crankcase Ventilation PTC-Resistor (5-Cyl. Petrol)
15 2008-2013: Climate Control System Relay, Engine Control Module (5-Cyl. Diesel), Fuel Leakage Control Pump (5-Cyl.), EGR Motor (1.6l Diesel, 1.8l Petrol), Mass Air Flow Sensor (MAF (5-Cyl. Petrol, 4-Cyl. Diesel)), Water Detection Sensor (4-Cyl. Diesel), Injection Valves (1.8l), EVAP Valve (Petrol), Intake Variable Valve Timing Solenoid (5-Cyl. Petrol), Turbocharger Control Valve (2.5l Turbo), Variable Intake Manifold Vacuum Valve (1.8l), Power Steering Pressure Switch (1.6l), Fuel Volume Control Valve (2.0l Diesel - 2008-2010), Exhaust Variable Valve Timing Solenoid (2.5l Turbo), Variable Turbo Geometry Solenoid (4-Cyl. Diesel), Air/Fuel Mixing Valve (1.8l), Intake Control Valve (2.0l Diesel), PTC-resistor - Crankcase Ventilation (5-Cyl. Petrol), EGR Cooling Bypass Valve (2011-2013)
36 10 Engine Control Module (ECM), Front Heated Oxygen Sensor (5-Cyl. Diesel - 2006-2013), Accelerator Pedal Sensor
20 Fuse in Holder:
Front Left/Right Auxiliary Lights
Relay
R1 2010-2013: Coolant Pump
R2 Horn
R3 2010-2013: Vacuum Pump
R4 Front Fog Light
R5 Fuel Filter Preheate
R6 2010-2013: Autostart
R7 2010-2013: Secondary Battery
R8 -
R9 Headlight Washer Motor
R10 Heated Rear Window
R11 Climate Control System
R12 Diesel (2008-2013): Glow Plug System
R13 Starter Motor
R14 Main (Engine Management System)

INSIDE FUSE COMPARTMENT
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I hope you'll still follow this post and be able to reply.


Thank You for the Helpful Info!