2012 B7 Passat 3.6 with a weird issue

[VW_R36suit]

Hello guys.

Bought a new battery about 6 months ago. Didn't drive the car for 5 days and was on my way to work and it was flat. Got a jumo and few days later same.

One day I walk outside and I hear the priming noise before I evwn unlock the car. Pull the FP fuse and it stops. Just to be sure I changed it, with no change. So I drive around like normal stop the car and lock it. No priming sound. My best guess is the sound starts about 20 minutes after locking the car.

Some extra info.
Car locks perfectly.
All lights are off.
Fuel economy is good.
Power is factory standard.
Literally other than this it is fine.

If anyone has ever experienced this and has a fix I'd be super great full as currently I'm removing the fuse at night to avoid battery drain.

[MIG]

That's a pretty weird issue, what's the fuse number you are pulling?

I will check out the wiring diagrams tonight, but if I remember correctly, the BCM controls the fuel pump module under the rear seats.
I would be testing the input to the enable signal at the pump module and be seeing if the BCM is commanding the pump on.

[VW_R36suit]

I think fuse 27

[VW_R36suit]

That's a pretty weird issue, what's the fuse number you are pulling?

I will check out the wiring diagrams tonight, but if I remember correctly, the BCM controls the fuel pump module under the rear seats.
I would be testing the input to the enable signal at the pump module and be seeing if the BCM is commanding the pump on.

I think fuse 27? Was complicated reading it backwards as all the fuse diagrams where LHD.

I can run a test for errors as I have the OBD11

[MIG]

SC27 feeds the fuel pump module directly; that's the one under the back seats.

Here is the pinout of the module,

Pin 1 = Power in (SC27)
Pin 2 = ECU PWM
Pin 3 = Power in (SC10)
Pin 4 = Fuel gauge out
Pin 5 = Gnd (Control)
Pin 6 = Gnd (Pump) 55256
Pin 7 = BCM pin T52b/38 pump enable
Pin 8 = Fuel gauge two out (AWD only)

I would check to see if a signal is present on pins 2 and 7 when the unit starts to prime itself.

[VW_R36suit]

SC27 feeds the fuel pump module directly; that's the one under the back seats.

Here is the pinout of the module,

Pin 1 = Power in (SC27)
Pin 2 = ECU PWM
Pin 3 = Power in (SC10)
Pin 4 = Fuel gauge out
Pin 5 = Gnd (Control)
Pin 6 = Gnd (Pump) 55256
Pin 7 = BCM pin T52b/38 pump enable
Pin 8 = Fuel gauge two out (AWD only)

I would check to see if a signal is present on pins 2 and 7 when the unit starts to prime itself.

I have seen a few videos on YouTube of this module getting replaced.

What type of tools would you recommend?

Thanks super appreciate the help.

[MIG]

A cheap multimeter and some T-Pins to back probe the connector should be plenty to troubleshoot the issue.

Check out this YouTube channel; this guy goes over troubleshooting different modules etc
DiagnoseDan - YouTube (https://www.youtube.com/@Diagnosedan)

[VW_R36suit]

A cheap multimeter and some T-Pins to back probe the connector should be plenty to troubleshoot the issue.

Check out this YouTube channel; this guy goes over troubleshooting different modules etc
DiagnoseDan - YouTube (https://www.youtube.com/@Diagnosedan)

Really appreciate the help.

Will take me some time to gwt around to this, so hopefully next week. Have 2 children with car seats and best to start next week.

[VW_R36suit]

I checked the OBD11 scan for error ans got tbis

Fuel pump relay - open circuit/short circuit to ground?

[MIG]

Have you got the full scan results?

It's pointing to the most likely cause being the fuel pump module, but I would want to test it to be sure, don't want to throw the parts cannon at it :P

[VW_R36suit]

Have you got the full scan results?

It's pointing to the most likely cause being the fuel pump module, but I would want to test it to be sure, don't want to throw the parts cannon at it :P
Its big lol

Some are easily explained. I've converted interior to LED, changed the mirrors also, and and externally all changed except the driving/Parker/highs.

Also my parking sensors haven't been fixed from my accident. They actually returned my car without fixing it, and have to this date haven't managed to get them operational. Insurance company is well onto them for bad repairs.

Ok here is the lisr reduced down to fit. All errors included.

OBDeleven vehicle history log

Date: 2023-06-14 11:16

VIN: WVWZZZ3CZCE132682
Car: Volkswagen Passat
Year: 2012
Body type: Variant
Engine: BWS
Mileage: 148980 KM

-----
Fault
Control unit: 01 Engine
Active faults: 0
Inactive faults: 0
System description: 3,6 FSI EU5
Software number: 03H906023L
Software version: 2758
Hardware number: 03H907309A
Hardware version: H04
Serial number: 00000000000000
ODX name: EV_ECM36FSI01103H906023L
ODX version: 002011
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04

-----
Fault
Control unit: 02 Transmission
Active faults: 0
Inactive faults: 0
System description: GSG DSG AG6 512
Software number: 02E300014C
Software version: 3102
Hardware number: 02E927770AL
Hardware version: F10
Serial number: 00001111240875
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04

-----
Fault
Control unit: 03 Brakes
Active faults: 0
Inactive faults: 0
System description: J104 C2 450M VECB
Software number: 3AA614109AJ
Software version: 0023
Hardware number: 3AA614109AJ
Hardware version: K03
Serial number: 00000005255230
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04

-----
Fault
Control unit: 08 Air Conditioning
Active faults: 0
Inactive faults: 0
System description: Climatronic
Software number: 3AA907044C
Software version: 0101
Hardware number: 3AA907044C
Hardware version: H03
ODX name: EV_Climatronic
ODX version: A01010
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04

-----
Fault
Control unit: 09 Central Electrics
Active faults: 4
Inactive faults: 0
System description: BCM PQ47 H
Software number: 3AA937087G
Software version: 0464
Hardware number: 3AA937087G
Hardware version: 421
Faults:
00984 - Left Tail Light Lamp Open circuit/short circuit to B+
static
Priority: 2
Frequency counter: 1
Driving cycle: 192
Mileage: 148642 km
00985 - Right Tail Light Lamp Open circuit/short circuit to B+
static
Priority: 2
Frequency counter: 1
Driving cycle: 192
Mileage: 148642 km
01259 - Fuel pump relay Open circuit/short circuit to ground
Intermittent
Priority: 5
Frequency counter: 2
Driving cycle: 235
Mileage: 148645 km
01519 - Right back-up light bulb Open circuit/short circuit to B+
static
Priority: 2
Frequency counter: 1
Driving cycle: 192
Mileage: 148642 km


Mileage: 148860 km
Date: 2023-06-10 14:04

-----
Fault
Control unit: 10 Parking Assistance
Active faults: 6
Inactive faults: 0
System description: PARKHILFE PLA
Software number: 3AA919475L
Software version: 0025
Hardware number: 4H0919475E
Hardware version: H06
Serial number: 56261201901792
ODX name: EV_EPHVA2C000000000
ODX version: 002008
Faults:
B107631 - Left rear park assist sensors No signal
static
Mileage: 148644 km
Priority: 3
Malfunction frequency counter: 1
Unlearning counter: 192
B107931 - Right rear park assist sensors No signal
static
Mileage: 148644 km
Priority: 3
Malfunction frequency counter: 1
Unlearning counter: 192
B107731 - Center left rear park assist sensors No signal
static
Mileage: 148644 km
Priority: 3
Malfunction frequency counter: 1
Unlearning counter: 192
B107831 - Center right rear park assist sensors No signal
static
Mileage: 148644 km
Priority: 3
Malfunction frequency counter: 1
Unlearning counter: 192
B107D31 - Side left rear park assist sensors No signal
static
Mileage: 148644 km
Priority: 3
Malfunction frequency counter: 1
Unlearning counter: 192
B107E31 - Side right rear park assist sensors No signal
static
Mileage: 148644 km
Priority: 3
Malfunction frequency counter: 1
Unlearning counter: 192


Mileage: 148860 km
Date: 2023-06-10 14:04

-----
Fault
Control unit: 13 Adaptive Cruise Control
Active faults: 0
Inactive faults: 0
System description: AC201 RDW A 036
Software number: 3AA907567A
Software version: 0170
Hardware number: 3AA907567
Hardware version: 000
Serial number: 00000000530614
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04

-----
Fault
Control unit: 14 Wheel Dampening
Active faults: 0
Inactive faults: 0
System description: DAEMPFUNGS-SG
Software number: 3C0907376A
Software version: 0071
Hardware number: 3C0907376
Hardware version: H07
Serial number: 11011203850002
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04



Fault
Control unit: 17 Dashboard
Active faults: 0
Inactive faults: 0
System description: KOMBI
Software number: 3AA920870C
Software version: 0609
Hardware number: 3AA920870C
Hardware version: H03
Serial number: 00000000000000
ODX name: EV_Kombi_UDS_VDD_RM09
ODX version: A04114
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04

-----
Fault
Control unit: 19 Gateway
Active faults: 0
Inactive faults: 0
System description: J533 Gateway
Software number: 7N0907530Q
Software version: 1623
Hardware number: 1K0907951
Hardware version: H41
Serial number: 060112F2002111
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04

-----
Fault
Control unit: 22 All Wheel Control
Active faults: 0
Inactive faults: 0
System description: Haldex 4Motion
Software number: 0BS907554C
Software version: 4016
Hardware number: 0BS907554C
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04
-----
Fault
Control unit: 25 Immobilizer
Active faults: 1
Inactive faults: 0
System description: IMMO 043
Software number: 3AA959433
Software version: 0400
Hardware number: 3AA959433
Hardware version: 008
Serial number: VWZCZ000000000
Faults:
02811 - Electronic steering column lock control module Faulty
Intermittent
Priority: 1
Frequency counter: 1
Driving cycle: 232
Mileage: 148644 km


Mileage: 148860 km
Date: 2023-06-10 14:04

-----
Fault
Control unit: 2E Media Player 3
Active faults: 0
Inactive faults: 0
System description: SG EXT.PLAYER
Software number: 5N0035342E
Software version: 0240
Hardware number: 5N0035342E
Hardware version: H13
Serial number: 7661686206
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04

-----

[VW_R36suit]

Hardware number: 3AA959433
Hardware version: 008
Serial number: VWZCZ000000000
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04

---------------------------------------------------------------
Fault
Control unit: 4F Central Electrics 2
Active faults: 0
Inactive faults: 0
System description: EZE_2
Software number: 7N0907532
Software version: 1623
Hardware number: 1K0907951
Hardware version: H41
Serial number: 060112F2002111
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04

---------------------------------------------------------------
Fault
Control unit: 52 Passenger Door
Active faults: 1
Inactive faults: 0
System description: TUER-SG BT
Software number: 3AA959702A
Software version: 0534
Hardware number: 3C0959792C
Hardware version: 002
Serial number: 0004221753
ODX name: EV_TSGBPQ35BRFVW46X
ODX version: A04001
Faults:
B11F501 - Front door warning light Electrical error
static
Mileage: 148645 km
Priority: 2
Malfunction frequency counter: 1
Unlearning counter: 193


Mileage: 148860 km
Date: 2023-06-10 14:04


---------------------------------------------------------------
Fault
Control unit: 61 Battery Regulation
Active faults: 1
Inactive faults: 0
System description: Batt.regelung
Software number: 7N0907534
Software version: 1623
Hardware number: 1K0907951
Hardware version: H41
Serial number: 060112F2002111
Faults:
02256 - Static current Upper limit exceeded
Intermittent
Priority: 7
Frequency counter: 3
Driving cycle: 237
Mileage: 148642 km


Mileage: 148860 km
Date: 2023-06-10 14:04

------

Fault
Control unit: 36 Driver Seat
Active faults: 0
Inactive faults: 0
System description: Sitzmemory
Software number: 3C8959760A
Software version: 2601
Hardware number: 3C8959760A
Hardware version: H05
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04

-----
Fault
Control unit: 42 Driver Door
Active faults: 0
Inactive faults: 0
System description: TUER-SG FT
Software number: 3AA959701A
Software version: 0534
Hardware number: 3C0959793C
Hardware version: 002
Serial number: 0004231783
ODX name: EV_TSGFPQ35BRFVW46X
ODX version: A04001
Faults:
No trouble codes found

Mileage: 148860 km
Date: 2023-06-10 14:04

-----
Fault
Control unit: 44 Steering Assistance
Active faults: 2
Inactive faults: 0
System description: EPS_ZFLS Kl. 207
Software number: 1K0909144P
Software version: 3305
Faults:
16353 - Control module Faulty
static
Priority: 6
Frequency counter: 1
Driving cycle: 71
Mileage: 81151 km
16355 - Control module Faulty
Intermittent
Priority: 6
Frequency counter: 1
Driving cycle: 255
Mileage: 81151 km


Mileage: 148860 km
Date: 2023-06-10 14:04

-----
Fault
Control unit: 46 Comfort System
Active faults: 0
Inactive faults: 0
System description: KSG PQ47 ELV 043
Software number: 3AA959433
Software version: 0634

[MIG]

01259 - Fuel pump relay Open circuit/short circuit to ground
Intermittent

-----


Based on that scan log, it looks to be more and more likely the fuel pump module, 2nd hand ones on eBay are not that expensive if you want to test swapping it out.





Also my parking sensors haven't been fixed from my accident. They actually returned my car without fixing it, and have to this date haven't managed to get them operational. Insurance company is well onto them for bad repairs.

-----

Look under the rear bumper on the driver's side, there is a gap between under so you don't have to remove the bumper and see if they forgot to connect the wiring harness, here is what it looks like.

55270

One connector is for the lights and the other is for the parking sensors.

[VW_R36suit]

Based on that scan log, it looks to be more and more likely the fuel pump module, 2nd hand ones on eBay are not that expensive if you want to test swapping it out.




Look under the rear bumper on the driver's side, there is a gap between under so you don't have to remove the bumper and see if they forgot to connect the wiring harness, here is what it looks like.

55270

One connector is for the lights and the other is for the parking sensors.
Had a battle to see up the gap, was wiggling all around but only found 1 connection that was connected. I see your picture which clearly shows both are attached to each other but for the life of me I just couldn't see another plug up there.
Also my repairer claims he can fix the issue without a problem, yet had the car for 30 days and couldn't work out the issue then😔

With thw fuel module is there a specific one I'll need for my car?

[MIG]

The part number you are looking for is 3c0906093c

[VW_R36suit]

The part number you are looking for is 3c0906093c
Thank you MIG😊