Chasing PDC Goose

[JakeM346]

I’ve retrofitted a PDC in the M3 but it doesn’t work.
the gong is functional and can be activated via inpa.
the pdc does not directly appear in Ista unless I click is and then it activates.
no faults are stored and sensors work perfect judging by inpa values
I can get the pdc to work perfectly fine if I flash with ncs but then after an ignition cycle it won’t work.

ZCS has been coded to KMB and EWS

i believe it’s probably a wake up problem.
the car is 07.2001

Any help is highly welcome

[nextelbuddy]

Is your car a factory SMG car or factory three pedal 6-speed car or is it a converted SMG to to 6mt car

[JakeM346]

Is your car a factory SMG car or factory three pedal 6-speed car or is it a converted SMG to to 6mt car

Factory 6 speed

[nextelbuddy]

Factory 6 speed

How did you do the retrofit? Did you follow the PDC retrofit guide? Where did the retrofit come from? Did you get it from someone who cut it out of a car?

That you wire up all of the wires?


When you did the retrofit there's two harnesses. There's the sensor harness which is usually intact and then there's the power supply harness plug that's usually cut from the car it came from.

So the power supply harness plug has several wires. Some of them go to the fuse box. Some of them go under the dash across to the driver side to the gong and the cluster... The important ones are




Cable A1 with the blue/yellow cable (reverse signal) - Connector X428

Cable A2 with the brown cable - Connector X219

Cable A3 with the white/red/yellow cable (k-bus) - Connector X10116

Cable A4 with the red/yellow cable - Terminal R

How did you wire those up?

The k bus and reverse signal and the brown cable get routed to the junction box that sits above on top of the fuse box

[JakeM346]

The rear harness came out of a donor car the power harness I made myself.
reverse blue yellow comes on when hitting reverse

green white comes on with the ignition and is wired to the fuse. (Pin 1)

blue grey is straight from (pin 8) pdc to gong (single plug)

Red/yellow
and
brown both also go to the gong from the fuse box and are 12 and ground. Pin 1 and 3

can bus goes straight from glove compartment to pdc (pin6)

then brown black is ground for the pdc pin 8

amd green yellow goes to pdc pin 12

[nextelbuddy]

The rear harness came out of a donor car the power harness I made myself.
reverse blue yellow comes on when hitting reverse

green white comes on with the ignition and is wired to the fuse. (Pin 1)

blue grey is straight from (pin 8) pdc to gong (single plug)

Red/yellow
and
brown both also go to the gong from the fuse box and are 12 and ground. Pin 1 and 3

can bus goes straight from glove compartment to pdc (pin6)

then brown black is ground for the pdc pin 8

amd green yellow goes to pdc pin 12

Did you get this from another E46?

Certain PDC modules and certain chassis had a PDC dedicated button. It's possible yours may be coded that way

The easiest thing to do would be to get NCS expert and do a trace file readout and look at the coding

Or if you have pasoft You can read that module and see what the coding of it is

[JakeM346]

Did you get this from another E46?

Certain PDC modules and certain chassis had a PDC dedicated button. It's possible yours may be coded that way

The easiest thing to do would be to get NCS expert and do a trace file readout and look at the coding

Or if you have pasoft You can read that module and see what the coding of it is

I have coded multiple times with a clean file and the button is disabled

[terra]

Did you add a reverse signal to the harness you made? It’s supposed to be able to work of the K-bus (which a factory 6speed should broadcast), but I wonder if there’s a build date thing going on there

[JakeM346]

Did you add a reverse signal to the harness you made? It’s supposed to be able to work of the K-bus (which a factory 6speed should broadcast), but I wonder if there’s a build date thing going on there

yes if you check the first pic it’s the blue yellow wire on the pdc module.
but maybe there is something wrong or different with the pdc wiring.
i will try adding a switch now and then wire the gong like in the e39
maybe that’s the point.

[terra]

Maybe try the other way then -- remove the reverse wire and see if the module can pick it up over the K-bus. Your car is a factory manual right? Do your reverse lights work and does your passenger mirror fold down in reverse?

[JakeM346]

Maybe try the other way then -- remove the reverse wire and see if the module can pick it up over the K-bus. Your car is a factory manual right? Do your reverse lights work and does your passenger mirror fold down in reverse?

Yes it works also without the reverse wire.

But I’ve gotten further.

Seems like the pdc units originally manufactured by valeo perform a self test upon ignition. And when the reverse sensors don’t match the expected impedance the system switches off.
what I basically do with ncs is overwrite this self test.
so in order to check this I will now check by switching around the pdc sensors. Old outside ones trick

[Bry5on]

I retrofitted full front and rear PDC with button so my experience may not be the same but I needed the fancy PDC gong from a PDC car to be wired in for PDC to function. Also, yes the system will not function with a dead sensor. You should be able to hear them all clicking when they’re operating correctly.

[JakeM346]

I retrofitted full front and rear PDC with button so my experience may not be the same but I needed the fancy PDC gong from a PDC car to be wired in for PDC to function. Also, yes the system will not function with a dead sensor. You should be able to hear them all clicking when they’re operating correctly.

i also have the gong.
might i ask how you wired it?
the 2 plug (3 and 1) or 1 4 pin plug?

[Bry5on]

i also have the gong.
might i ask how you wired it?
the 2 plug (3 and 1) or 1 4 pin plug?

I can’t recall precisely but I think it was just a single plug at the gong.

I had a lot more wires to run but for the e46 sections I followed this but used the e39 PDC power/comms retrofit harness: