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Old 13-10-17, 10:15 AM   #1
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Join Date: Oct 2017
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Exclamation Peugeot 307 Airbag Fault - Error Code P1606

Hi all,

My car failed its MOT yesterday because of an airbag fault. The garage have come back to me with fault code P1606 - Seat Belt Trigger (Right) - Short circuit to earth.

Is anyone able to help diagnose the fault?

The mechanic said he checked the normal causes such as the connections under the seat and tried to reset the ECU.

I have done some research online and found that it is usually either loose connections or the Com 2000 unit (can anyone confirm)?

I have also heard a 2ohm resistor on the ECU can fix things?

Is this something a novice should attempt to repair themselves or leave it to a professional?

Its a Peugeot 307 - Automatic 2002 - Not sure if there are any compatibility issues with parts based on the year?

Any help much appreciated!
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Old 13-10-17, 11:35 AM   #2
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Usually the under seat connections. Strip down and maybe re-solder the joins.

Make sure you disconnect battery and leave 15 minutes though.

Might also be a good idea to check both front seats, I did once read that because they're French, drivers side is sometimes referred to the left seat.

I'd also get a second opinion on that diagnostic. "Peugeot P1606" in Google shows something very different.
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Old 13-10-17, 12:28 PM   #3
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Thank you for your help!

I am trying to arrange an auto electrician to have a look but need the car for work on Monday. Was hoping to buy any parts I need so it can be done in one go.

Just to confirm it was P1606 - Not sure if they have written it down incorrectly.

Useful to know that the drivers side could be the other way around also!
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Old 13-10-17, 01:13 PM   #4
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I had an airbag fault some time ago. Mine turned out to be the drivers seatbelt causing the problem. To check them, disconnect the cable on the bottom of the seat belt and connect a 2.2 Ohm resister to the plug on the end of the cable. If the fault disappears, there's your faulty item. I don't recommend that you leave the resister there as a way of by-passing the problem, only to find the fault.
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Old 13-10-17, 08:47 PM   #5
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It will be a B code (Body System) not a P code (Powertrain) but some cheaper OBD tools always give P prefix to all codes.

As above check all seat wiring as that it the number one cause. Seat airbag circuit does not use the COMM unit so that should be fine
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Old 18-10-17, 12:15 AM   #6
Join Date: Oct 2017
Posts: 33

The only thing that goes through the com 2000 unit is the drivers airbag in the steering wheel.

There is a connector with a blue plug and a connector with a brown plug, you can remove the two torques screws with the lower part of the cowling on the steering column and disconnect these 1 at a time - put a 3.3ohm resistor between the two wires to bypass the ignitor unit.

However as has been mentioned - this is not your fault.

Make sure you disconnect your battery properly when working on airbags, and connect it properly or you can corrupt your BSI:

================================================== ======
Whenever a vehicle battery has to be dis-connected, switch off all equipment,
interior lights etc, close the doors leaving the drivers window open.
Switch off the ignition and remove the key and any DIAG equipment.

Wait a full 3 minutes before disconnecting the battery.

The BSi must be allowed to go to SLEEP i.e. into "power save mode". Do not
operate any equipment on the vehicle during this time. Remember, even
opening the bonnet will wake the BSi on a vehicle fitted with alarm / bonnet switch.

If the battery is under the bonnet, open the bonnet first and leave it up. 807
batteries can be dis-connected through the drivers window, remove floor cover
ALWAYS disconnect any DIAG equipment and do not operate any plips from any
other vehicles during the 3 minute waiting period.

Unless otherwise instructed by Product Service, you must always
carry out the following procedure, often referred to as a "soft re-boot", to
minimise the possibility of the BSi corrupting its own software when
reconnecting the vehicles battery supply.
Ensure the procedure for battery disconnection has been adhered to and
importantly all BSi functions were switched off with the drivers window left
1 Close all doors
2 Remove ignition key if left in ignition
3 Reconnect battery. DO NOT open any doors
4 Wait 10 seconds
5 Switch on headlights through the drivers window (you will hear a "bong") (note: Snap-on says Side-lights)
6 Switch on ignition then start the vehicle and check system functions

NOTE: Upon reconnection, if any vehicle function controlled by the BSi i.e .
interior light is switched on,the internal operation of the BSi has the potential
to spike or corrupt its configuration and software program......
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