PDC troubles like no other

[tjpike]

Hi there,

I'm having a rather odd gremlin, my E38's PDC system is acting up. It worked fine in the morning when i was parking the car but didn't in the evening and hasn't worked since then.

Now I've had sensors fail in the past and the system give me the long beep when PDC is activated. But this time, the PDC system just doesn't turn on at all. No light on the PDC button, no beeping, no turning on in reverse, nothing

I checked the fuse and the fuse is fine, replaced it and tested and still nothing. Is the PDC module dead? How should I troubleshoot this?

I tried hooking up to the car with PA soft but the PDC module doesn't show up (it's greyed out).

Any advice appreciated.

TIA

[a777fan]

Certainly sounds like a dead module, or you’ve lost powers/grounds to it somewhere.


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[Mayorchuck]

If I am reading the WDS right, it goes Iggy switch, Fuse 19, uniloader relay in trunk (3rd from right), Fuse 64, PDC module. The uniloader relay also handles things like rear hvac control and cigarette lighter, so if those things are working, it would rule out that relay and Fuse 19. I've never had a bad PDC module, or really ever heard of it before, but it shows to sit under the row of fuses in the trunk. It has a two 12 pin connections. You should be getting power on pin one of the black connector.
A81, X18013


in rear RH side of luggage compartment

A81	Parking aid control unit
X18013	Component connector (26-pin, red), Parking aid control unit

A81 Parking aid control unit

Plug connector overview

Number	X-pin, colour	Description
X300	12-pin, black	Plug connector Parking aid control unit
X18013	12-pin, natural	Plug connector Parking aid control unit

Pin assignments at plug connector X300

Pin	Type	Description / Signal type	Connection / Measuring notes
1	E	Voltage supply, terminal 15	Fuse F64
2	A	PDC loudspeaker activation	Parking aid speaker
3		Not used
4	E/A	I/K-bus signal link	Connector, I/K-bus
5		Not used
6	M	Terminal 31	Ground point
7	A	Parking aid indicator lamp	Switching centre
8	M	Ground for PDC loudspeaker	Parking aid speaker
9	A	Parking aid speaker	Gong
10	A	Signal, parking aid switch	Switching centre
11	A	Reversing light signal	Gong
12		Not used

Pin assignments at plug connector X18013

Pin	Type	Description / Signal type	Connection / Measuring notes
1	M	Ground, rear centre left converter	Rear centre left converter
2	M	Ground, rear right converter	Rear right converter
3	M	Ground, rear left converter	Rear left converter
4	A	Positive activation, rear centre right converter	Rear centre right converter
5	A	Positive activation, rear centre left converter	Rear centre left converter
6	A	Positive activation, rear right converter	Rear right converter
7	M	Ground, rear centre right converter	Rear centre right converter
8	A	Signal line, rear centre right converter	Rear centre right converter
9	A	Signal line, rear centre left converter	Rear centre left converter
10	A	Signal line, rear right converter	Rear right converter
11	A	Signal line, rear left converter	Rear left converter
12	A	Positive activation, rear left converter	Rear left converter

[tjpike]

If I am reading the WDS right, it goes Iggy switch, Fuse 19, uniloader relay in trunk (3rd from right), Fuse 64, PDC module. The uniloader relay also handles things like rear hvac control and cigarette lighter, so if those things are working, it would rule out that relay and Fuse 19. I've never had a bad PDC module, or really ever heard of it before, but it shows to sit under the row of fuses in the trunk. It has a two 12 pin connections. You should be getting power on pin one of the black connector.
A81, X18013


in rear RH side of luggage compartment

A81	Parking aid control unit
X18013	Component connector (26-pin, red), Parking aid control unit

A81 Parking aid control unit

Plug connector overview

Number	X-pin, colour	Description
X300	12-pin, black	Plug connector Parking aid control unit
X18013	12-pin, natural	Plug connector Parking aid control unit

Pin assignments at plug connector X300

Pin	Type	Description / Signal type	Connection / Measuring notes
1	E	Voltage supply, terminal 15	Fuse F64
2	A	PDC loudspeaker activation	Parking aid speaker
3		Not used
4	E/A	I/K-bus signal link	Connector, I/K-bus
5		Not used
6	M	Terminal 31	Ground point
7	A	Parking aid indicator lamp	Switching centre
8	M	Ground for PDC loudspeaker	Parking aid speaker
9	A	Parking aid speaker	Gong
10	A	Signal, parking aid switch	Switching centre
11	A	Reversing light signal	Gong
12		Not used

Pin assignments at plug connector X18013

Pin	Type	Description / Signal type	Connection / Measuring notes
1	M	Ground, rear centre left converter	Rear centre left converter
2	M	Ground, rear right converter	Rear right converter
3	M	Ground, rear left converter	Rear left converter
4	A	Positive activation, rear centre right converter	Rear centre right converter
5	A	Positive activation, rear centre left converter	Rear centre left converter
6	A	Positive activation, rear right converter	Rear right converter
7	M	Ground, rear centre right converter	Rear centre right converter
8	A	Signal line, rear centre right converter	Rear centre right converter
9	A	Signal line, rear centre left converter	Rear centre left converter
10	A	Signal line, rear right converter	Rear right converter
11	A	Signal line, rear left converter	Rear left converter
12	A	Positive activation, rear left converter	Rear left converter

Thank you for this. I finally got some time to work on this. I pulled the PDC module out and looks like it has 3 plugs going to it. I did unplug the black one and I am getting power to pin 1. So i guess that rules that out.

I have a replacement PDC module on it's way, in the meantime if anyone else has any ideas on what to try, please let me know!

[CPHES]

If you have issues with the light control module, it plays games with pdc. My LKM has been acting up, and when it does, pdc dies