2012 Galaxy Titanium rear parking sounder fault (B1B52)

[DaveHkent]

Can anyone help me find the rear parking sounder in my 2012 Galaxy Titanium, or suggest if the bodge below is a bad idea?

When I start the engine, put it in reverse or press the parking sensor switch, I get a continuous tone from the parking system. Plugging in a diagnostic tool, ForScan says B1B52, rear parking sounder failure. The problem is, I can't find it.

A few forums and I even bought the Haynes manual, says it is in the headlining. I stripped down all the roof space, and it doesn't appear to be up there. I found the parking aid module behind the drivers side of the boot panel (pictured) and followed the cables. These go under the carpet in the boot and run towards the front of the car. Removing the rear and middle seats, I can't find the sounder. Some resources I have found say the speaker is attached directly to the PAM, on mine it is not. One resource did say that the largest connector to the PAM should have the rear sounder connected by a brown wire with a blue stripe and a blue wire with a green stripe. These connect to pins 2 & 10. In my very rough diagram, the pins shaded are the ones which have an electrical connection. Putting my multimeter on these two pins shows there is no electrical connection between the two, so it looks like a cable break or failed sounder somewhere.

Following the wiring loom to in front of the middle drivers side seat, it goes down below the drivers seat and the blue with green stripe wire does still seem to be present.

The few things I'm struggling to answer are:

- Where is this sounder in a 2008 Galaxy?

- Can I bodge it, by getting a new sounder, splicing the two wires I have identified and putting the new sounder in the boot?

- Does anyone have a valid pinout diagram for the PAM (BS7T-15K866-AD), to check I'm following the correct wires? I was disappointed to find the Haynes manual doesn't have this or a wiring diagram for the parking system.

Any help appreciated.

 

Picture 1: My PAM

Picture 2: The largest connector

Picture 3: The wiring loom showing the (blurred) blue/green wire going under the drivers side storage area, in the middle seat foot space. I've had my hand under here and I can't feel any wires branching off or signs of a sounder

Picture 4: Rough wiring diagram showing what is apparently the sounder cables / pins

Edited August 20, 2022 by DaveHkent
Mistake on year

[DaveHkent]

Sorry, it is a 2012 model and not a 2008 - post edited

[unofix]

I'm not quite sure how you have a parking sounder fault and the sounder is still making a noise ?

On a 2012 Galaxy the sounder is a very small unit located just inside the headlining on the rear nearside (passenger side).

[iantt]

9 minutes ago, unofix said:

I'm not quite sure how you have a parking sounder fault and the sounder is still making a noise ?

On a 2012 Galaxy the sounder is a very small unit located just inside the headlining on the rear nearside (passenger side).

That's because it's got front and rear parking sensors with Sounders for front and rear. When a rear sounder fails it uses the front sounder to give a tone. 

 

[DaveHkent]

Can I check what that means "just inside the headlining on the rear nearside (passenger side)"?

I pulled the roofing down starting at the back and working forward and I could not find it. In terms of seats and doors does anyone know more precisely where it might be?

[unofix]

I'm assuming this is the 2012 Galaxy (your profile says it is a 2008).

Information is very limited on the 2012 model. The original 2006 - models had the sounder fitted with the parking control module. At some point in time Ford relocated it up in to the rear headlining near the rear post.

Sorry unable to find any actual pictures of the location.

[DaveHkent]

Sorry, it was 2012, had a brain lapse and logged everything in this thread as 2008. I've corrected my profile now.

I've found the location very hard to find too. It must be somewhere but quite well hidden. My best guess now is that for some reason the wiring goes from the PCM at the back, all the way to the front and then loops back again to somewhere.

Do you know if the wiring information I have is correct and I've identified the two pins, or if there is any detail on the 2012 PCM wiring anywhere? If those are correct, cutting my losses on the standard location and splicing off those two wires is probably my best bet.

[unofix]

45 minutes ago, DaveHkent said:

I've found the location very hard to find too.

You have found the rear sounder ????? 🎉🎉🎉

It might be helpful to post a photo for others to see in the future

[DaveHkent]

No, I have not been able to find the sounder, any reliable documentation to say where it is or a wiring diagram/pinout for the 15k866 PAM.

Is there a paid-for source of manual that can reliably give the wiring information? There are snippets on the web, and I'm disappointed at how bad the Haynes manual I bought was.

[bemarc]

Okay I am just about to give up looking for this stupid sounder and splice in a new speaker.

 

How confident are you in the wire colours?

[bemarc]

Okay I bought the ford service manual and it shows the speaker location on the Galaxy as in the roof lining.

 

 

For completeness the S-Max is shown as the D-Pillar.

 

 

[bemarc]

Sure enough the speaker was where it is shown.  But some M$$%KER has removed/cut away the loom/connector. 

WHY!  🙂

Looks like I will be splicing mine back in after all. so back to diagnosing the wires. 

 

According to the Haynes manual, it is either Bu/GN and BN/BU OR VT/OG and GY/BN.

 

 

From this youtube, the front speaker appears to be the VT/OG and GY/BN.

 

[bemarc]

It works!!!!!

Sorry for the running commentary.  Spliced in the speaker to the BU/GN and BN/BU and my error cleared and the system is working 🙂

 

[unofix]

4 hours ago, bemarc said:

Spliced in the speaker to the BU/GN and BN/BU and my error cleared and the system is working 🙂

I bet you're 'Buzzing' with success 🤣

Well done.

[DaveHkent]

@bemarcThank you so much, it is fixed.

 It was behind the boot roof liner where your post said, right at the back slightly to the left of centre. I had it all stripped down a few weeks ago and missed it along with the wire going to it. I pulled out the two plastic pins and eased the roof down slightly, not even removing the D-pillars. I could see the wire that goes to the various electrics in the boot door (don't pull the external rubber seal off this, it is a nightmare to get back on!). I slid my hand in for a feel around, mostly following these wires on the inside, my hand caught something and the speaker dropped down. I don't know exactly where it was and because it was mostly touch, I could not take a photo.

There was enough slack on the cable to pull it forward enough for me to unplug. Putting a multimeter on, it confirmed an open circuit. I had bought a replacement speaker during the week with the intention of splicing it, swapped it over and my parking aid system works perfectly again.

Time to diagnose and actually fix: Around 30 minutes

Cost: Around £25 for a diagnostic dongle and £18 for the part, so £43

Time taken to find the damn thing, stripping down half my car: 6-7 hours!

 

Still better than the experience at my local autoelectric specialist garage who held my car for 6 days, charged my £126 labour costs and had still failed to solve the problem when I really needed my car back after only expecting to lose it for a day.

[bemarc]

Time taken to find the damn thing, stripping down half my car: 6-7 hours!

 

THIS ^^^^  🙂 !!! 

[Grisleigh]

On 8/20/2022 at 1:16 PM, DaveHkent said:

Can anyone help me find the rear parking sounder in my 2012 Galaxy Titanium, or suggest if the bodge below is a bad idea?

When I start the engine, put it in reverse or press the parking sensor switch, I get a continuous tone from the parking system. Plugging in a diagnostic tool, ForScan says B1B52, rear parking sounder failure. The problem is, I can't find it.

A few forums and I even bought the Haynes manual, says it is in the headlining. I stripped down all the roof space, and it doesn't appear to be up there. I found the parking aid module behind the drivers side of the boot panel (pictured) and followed the cables. These go under the carpet in the boot and run towards the front of the car. Removing the rear and middle seats, I can't find the sounder. Some resources I have found say the speaker is attached directly to the PAM, on mine it is not. One resource did say that the largest connector to the PAM should have the rear sounder connected by a brown wire with a blue stripe and a blue wire with a green stripe. These connect to pins 2 & 10. In my very rough diagram, the pins shaded are the ones which have an electrical connection. Putting my multimeter on these two pins shows there is no electrical connection between the two, so it looks like a cable break or failed sounder somewhere.

Following the wiring loom to in front of the middle drivers side seat, it goes down below the drivers seat and the blue with green stripe wire does still seem to be present.

The few things I'm struggling to answer are:

- Where is this sounder in a 2008 Galaxy?

- Can I bodge it, by getting a new sounder, splicing the two wires I have identified and putting the new sounder in the boot?

- Does anyone have a valid pinout diagram for the PAM (BS7T-15K866-AD), to check I'm following the correct wires? I was disappointed to find the Haynes manual doesn't have this or a wiring diagram for the parking system.

Any help appreciated.

 

Picture 1: My PAM

Picture 2: The largest connector

Picture 3: The wiring loom showing the (blurred) blue/green wire going under the drivers side storage area, in the middle seat foot space. I've had my hand under here and I can't feel any wires branching off or signs of a sounder

Picture 4: Rough wiring diagram showing what is apparently the sounder cables / pins

This may be of help?

Electrical component locations _ Autodata.pdf