Hello. Peugeot 407 SW, 2.0 HDI, 2007. Problem - no left rear indicator. After unplugging the battery there are moments that the direction is, but rarely and quite briefly. BSI error B4BD (short to rear left turn signal) appears. Does anyone have knowledge of which BSI pin signal goes to the left...

The rear left direction is on the A17 287C cable.

Or maybe something is wrong with the lamp itself? try to make mux cables to swap the right and left directions and check the effect.

The lamp was burnt out, but it's done (with warranty until the end of this car). If I continue to blow it in ... I will solder the light bulb directly to the cables.

If it shows a short circuit, it won't help you: think for yourself maybe something wrong with the fiber, it shines but it has a short circuit for the computer?

But I take, I take the clamp for about a minute and sometimes everything is OK, the longest it walked over half an hour. After all, in BSI there may also be a short circuit or a damaged driver from this bulb. Is there any connection block between BSI and rear lamp (something similar as in reno).

As if the short circuit was in BSI, the bulb would not go out and there would be no short circuit fault to the ground because it is physically impossible. It looks like the bulb just burned out the mass because it took too much electricity and you know how now everyone cuts costs, he repaired the mass but the bulb was probably the same. My suggestion to swap left with right seems quite sensible in your case. According to this algebra: ch. Mass + ch. light bulb = true good weight + ch. light bulb = error

I also replaced Narva bulb, the lamp was in perfect condition (the fire was a bit lit, but it was already repaired). At BSI you still have outputs that are blocked by ground condensers, can stick such a cusik.

Did you give weight from the wire to the lamp board by soldering directly?

Exactly, I always do that when the burnt mass in the socket. Gentlemen, I have something lucky these peugots lately, but so far it has always helped download the clamp, even a few days ago one customer over the phone suggested what to do, in a moment he called and thanked.

Not only peugeots experience such a defect but it is strange that here the disease affects only one specific circuit. Since it helps to remove the clamp, it is obviously a computer reset, the mystery is why the reset does not occur after the ignition is turned off. You just have to remember that this direction is used in emergency which operate without a key and that would clarify the matter. I have already suggested to you to change the left direction from the right direction twice and I will not be there anymore. In the end you have to decide on something and cut the wire anyway to exclude accidental short to ground (it may well be a temporary short to the alloy wire in the ankle) e.g. as a result of rubbing the wire insulation.

Peugeot 407 SW 2007 2.0 HDI: Rear Left Turn Signal Not Working, BSI Error B4BD & Pin Info

Aleksander_01 22878 18

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Which BSI wire or pin feeds the rear left turn signal on a 2007 Peugeot 407 SW, and what should I check for a B4BD short-to-left-rear-indicator fault?

The rear left indicator signal is on the A17 287C wire at the black 3-pin plug, so you should trace that line at the rear lamp rather than only looking for a BSI pinout [#16936339][#16936886] A good first test is to swap the left and right indicator circuits at the lamp to see whether the fault follows the lamp or stays with the car wiring [#16934242] The thread also points to a possible lamp-board/driver or socket-ground problem, since the signal was intermittent after battery disconnect and the lamp-side fault was eventually found there [#16936886][#16934396]

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#1 16934200 03 Jan 2018 22:21

Aleksander_01 Aleksander_01

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16934200 03 Jan 2018 22:21

Hello.
Peugeot 407 SW, 2.0 HDI, 2007.
Problem - no left rear indicator.
After unplugging the battery there are moments that the direction is, but rarely and quite briefly.
BSI error B4BD (short to rear left turn signal) appears.
Does anyone have knowledge of which BSI pin signal goes to the left back.
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#2 16934242 03 Jan 2018 22:32

Anonymous Anonymous

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Post #2
16934242 03 Jan 2018 22:32

Or maybe something is wrong with the lamp itself? try to make mux cables to swap the right and left directions and check the effect.
#3 16934276 03 Jan 2018 22:42

Aleksander_01 Aleksander_01

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Post #3
16934276 03 Jan 2018 22:42

The lamp was burnt out, but it's done (with warranty until the end of this car). If I continue to blow it in ... I will solder the light bulb directly to the cables.
#4 16934296 03 Jan 2018 22:49

Anonymous Anonymous

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Post #4
16934296 03 Jan 2018 22:49

Aleksander_01 wrote:
BSI error B4BD (short to rear left turn signal) appears.

If it shows a short circuit, it won't help you:

Aleksander_01 wrote:
If I continue to blow it in ... I will solder the light bulb directly to the cables

think for yourself
maybe something wrong with the fiber, it shines but it has a short circuit for the computer?
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#5 16934332 03 Jan 2018 23:01

Aleksander_01 Aleksander_01

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Post #5
16934332 03 Jan 2018 23:01

But I take, I take the clamp for about a minute and sometimes everything is OK, the longest it walked over half an hour. After all, in BSI there may also be a short circuit or a damaged driver from this bulb. Is there any connection block between BSI and rear lamp (something similar as in reno).
#6 16934347 03 Jan 2018 23:06

Anonymous Anonymous

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Post #6
16934347 03 Jan 2018 23:06

As if the short circuit was in BSI, the bulb would not go out and there would be no short circuit fault to the ground because it is physically impossible.
It looks like the bulb just burned out the mass because it took too much electricity and you know how now everyone cuts costs, he repaired the mass but the bulb was probably the same.
My suggestion to swap left with right seems quite sensible in your case.
According to this algebra: ch. Mass + ch. light bulb = true
good weight + ch. light bulb = error
#7 16934384 03 Jan 2018 23:19

Aleksander_01 Aleksander_01

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Post #7
16934384 03 Jan 2018 23:19

I also replaced Narva bulb, the lamp was in perfect condition (the fire was a bit lit, but it was already repaired).

At BSI you still have outputs that are blocked by ground condensers, can stick such a cusik.
#8 16934389 03 Jan 2018 23:21

andrzej20001 andrzej20001

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Post #8
16934389 03 Jan 2018 23:21

Did you give weight from the wire to the lamp board by soldering directly?
#9 16934396 03 Jan 2018 23:23

Aleksander_01 Aleksander_01

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Post #9
16934396 03 Jan 2018 23:23

andrzej20001 wrote:
Did you give weight from the wire to the lamp board by soldering directly?

Exactly, I always do that when the burnt mass in the socket.

Gentlemen, I have something lucky these peugots lately, but so far it has always helped download the clamp, even a few days ago one customer over the phone suggested what to do, in a moment he called and thanked.
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#10 16934628 04 Jan 2018 07:17

andrzej20001 andrzej20001

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16934628 04 Jan 2018 07:17

Hook is Maybe a module?
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#11 16934734 04 Jan 2018 09:19

Anonymous Anonymous

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16934734 04 Jan 2018 09:19

Aleksander_01 wrote:
Gentlemen, I have something lucky these peugots lately, but so far it has always helped download the clamp, even a few days ago one customer over the phone suggested what to do, in a moment he called and thanked.

Not only peugeots experience such a defect but it is strange that here the disease affects only one specific circuit. Since it helps to remove the clamp, it is obviously a computer reset, the mystery is why the reset does not occur after the ignition is turned off. You just have to remember that this direction is used in emergency which operate without a key and that would clarify the matter.

I have already suggested to you to change the left direction from the right direction twice and I will not be there anymore.
In the end you have to decide on something and cut the wire anyway to exclude accidental short to ground (it may well be a temporary short to the alloy wire in the ankle) e.g. as a result of rubbing the wire insulation.
#12 16934764 04 Jan 2018 09:39

Aleksander_01 Aleksander_01

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Post #12
16934764 04 Jan 2018 09:39

The hook is gone. Gentlemen, I asked for which BSI pin is responsible for this bulb. It is known that I will find this cable, it is a waste of time and here you have to look for the number on the cable (and the eyes are no longer those). Once I find this cable at BSI, it is known to cut and solder the bulb to it and ground, and then observe. Well, the tenth is coming time to go to work.
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#13 16936339 04 Jan 2018 21:11

Daro122 Daro122

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Post #13
16936339 04 Jan 2018 21:11

The rear left direction is on the A17 287C cable.
#14 16936886 05 Jan 2018 00:29

Aleksander_01 Aleksander_01

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Post #14
16936886 05 Jan 2018 00:29

I located on the black 3-pin plug. Unfortunately, but as I thought, the driver (half) is released from this bulb. I will buy and substitute tomorrow.

Thanks Daro122 - next time I am asking for a faster response
#15 17214321 10 May 2018 23:41

krych14 krych14

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Post #15
17214321 10 May 2018 23:41

Maybe you could tell exactly which plug which cable and which draywerek and whether it worked, I have the same problem only that the Peugeot 308
#16 19303480 07 Mar 2021 21:08

Nas19 Nas19

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Post #16
19303480 07 Mar 2021 21:08

Hello, what is this driver?
I have a problem with the direction in 407, the mass is done and the direction is still missing
#17 19303495 07 Mar 2021 21:14

andrzej20001 andrzej20001

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Post #17
19303495 07 Mar 2021 21:14

Disconnect the battery for a while.
#18 19306528 09 Mar 2021 11:21

Nas19 Nas19

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Post #18
19306528 09 Mar 2021 11:21

I was the first to do it, even at 4 hours it was unfastened and it did not help

Added after 1 [minutes]:

What is this driver?
Only in this lamp I have no direction
#19 19317075 14 Mar 2021 11:10

Nas19 Nas19

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Post #19
19317075 14 Mar 2021 11:10

The computer has a B4BD error
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Topic summary

✨ The discussion revolves around a malfunctioning left rear turn signal on a 2007 Peugeot 407 SW 2.0 HDI, accompanied by a BSI error code B4BD indicating a short circuit. Users suggest various troubleshooting steps, including checking the bulb, swapping connections between the left and right indicators, and examining the BSI module for potential faults. The importance of grounding and the possibility of a damaged driver are highlighted. A specific cable, A17 287C, is identified as responsible for the left rear direction signal. The author plans to replace the driver after locating the appropriate connection.
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FAQ

TL;DR: Peugeot 407 SW rear-left indicator faults often trace to 1 failed BSI output; “I located on the black 3-pin plug.” [Elektroda, Aleksander_01, post #16936886]

Why it matters: This FAQ helps 2004–2010 Peugeot owners quickly diagnose BSI B4BD turn-signal errors without chasing the entire loom.

Quick-Facts

Rear-left turn feed identified as A17 287C wire to lamp cluster. [Elektroda, Daro122, post #16936339]
Related connector noted as a black 3‑pin plug at the BSI area. [Elektroda, Aleksander_01, post #16936886]
Code B4BD = “short to rear left turn signal” reported by scan tool. [Elektroda, Aleksander_01, post #16934200]
Battery clamp pull can restore function temporarily, sometimes for over 30 minutes. [Elektroda, Aleksander_01, post #16934332]
Burned lamp-ground (“mass”) fixed by adding a direct ground wire to the board. [Elektroda, Aleksander_01, post #16934396]

Quick Facts

Rear-left turn feed identified as A17 287C wire to lamp cluster. [Elektroda, Daro122, post #16936339]
Related connector noted as a black 3‑pin plug at the BSI area. [Elektroda, Aleksander_01, post #16936886]
Code B4BD = “short to rear left turn signal” reported by scan tool. [Elektroda, Aleksander_01, post #16934200]
Battery clamp pull can restore function temporarily, sometimes for over 30 minutes. [Elektroda, Aleksander_01, post #16934332]
Burned lamp-ground (“mass”) fixed by adding a direct ground wire to the board. [Elektroda, Aleksander_01, post #16934396]

What does BSI error B4BD mean on a Peugeot 407?

B4BD indicates a detected short circuit on the rear-left turn-signal circuit. The symptom is a dead left indicator and stored BSI fault. [Elektroda, Aleksander_01, post #16934200]

Which BSI wire feeds the rear-left turn signal?

Users identified the rear-left indicator feed as wire A17 287C that runs from the BSI to the left rear lamp cluster. [Elektroda, Daro122, post #16936339]

Where is the connector for this circuit on the BSI?

One repair located the relevant lead on a black 3‑pin plug at the BSI. The output “driver” for that bulb had failed. [Elektroda, Aleksander_01, post #16936886]

Will disconnecting the battery reset the indicator fault?

A battery disconnect can temporarily restore the indicator. "Disconnect the battery for a while." Then retest the circuit. [Elektroda, andrzej20001, post #19303495]

How long should I leave the battery disconnected?

One member tried up to 4 hours with no lasting fix. If the fault returns, the issue isn’t reset-related. [Elektroda, Nas19, post #19306528]

Can swapping left and right indicator feeds help diagnose?

Yes. Swap mux/feeds to compare left vs right. If the fault follows the lamp, suspect the lamp/ground; if not, suspect wiring/BSI. [Elektroda, Anonymous, post #16934242]

What if the lamp ground (“mass”) pad is burnt?

Add a dedicated ground wire soldered from harness ground to the lamp board. This restored function in similar cases. [Elektroda, Aleksander_01, post #16934396]

What is the “driver” people mention in this thread?

It’s the BSI’s output stage for the bulb. One case found that driver "released" (failed) for the left rear circuit. [Elektroda, Aleksander_01, post #16936886]

Could a short inside the BSI be the cause?

One responder noted if the BSI itself shorted, the bulb behavior and ground fault message wouldn’t match that scenario. [Elektroda, Anonymous, post #16934347]

Why does a battery reset help only briefly?

Reset clears a latched fault, but hazards work without ignition. Intermittent wiring or lamp issues can quickly retrigger the code. [Elektroda, Anonymous, post #16934734]

How do I perform a quick 3‑step BSI reset for the indicators?

Switch everything off and open the hood.
Disconnect the battery negative clamp and wait a short while.
Reconnect, then test indicators and hazards.
"Disconnect the battery for a while." [Elektroda, andrzej20001, post #19303495]

Only the rear-left lamp is dead—what next?

If ground is good and bulb is new, suspect the BSI output for that circuit. One fix required replacing that BSI driver. [Elektroda, Aleksander_01, post #16936886]

Is there an inline module between BSI and the rear lamp?

The thread’s working fix targeted the BSI output and the A17 287C run, not a separate inline module. [Elektroda, Daro122, post #16936339]

What’s an edge case that can confuse diagnostics?

A lamp can still shine yet log a ground short. Check for partially burned ground paths on the lamp board. [Elektroda, Anonymous, post #16934347]

What real-world duration did the reset last?

After pulling the clamp, the indicator worked again, sometimes for over half an hour before failing. [Elektroda, Aleksander_01, post #16934332]