Problem:
2003 Lincoln Town Car Signature with Park Aid
Interface OHP ELMconfig USB with manual HS//MS switch
Connects successfully in HS mode and I can see DDM,DSM LCM, ATC,ABS, PATS and other modules – but not PAM.
Suggestion:
The ISO9141 Protocol has been supported by Both Forscan And ELM327
based adaptors since the beginning versions. HS/MS switch must be in the
HS Can position for these early SCP/PWM and ISO equipped Vehicles.
MSCan Position will have no connection.
WDS and NGS are the obsolete Ford Diagnostic software and hardware that were replaced by IDS and the VCM and VCM 2
Your Lincoln May have a DLC UBP pin 3 but as far as I know the Cars
never had a UBP network or anything connected to it as it was mostly
used in the Trucks and SUV’s. There would be about 3 to 5 volts positive
to Ground if anything is connected to Pin number 3. Another member on
this forum had checked his Lincoln and the 3 pin was there but it was
dead.
If the PAM module was responding to Forscan through the adaptor, it
should have shown up in the ISO network tree along with any other
modules that are likely on that same network(The overhead consol display
that the PAM warning appears on would have to be on that network) and
also appeared in the vehicle configuration list.
If it is not showing up there then you will need to gain
access(Remove trim panels and such like. Check manual for module
location and connector views) to the display module connector and the
PAM module connector to check if the positive voltage is present in the
PAM module connector and the ground connection out of the connector has
continuity.
Then continuity from the PAM module connector to each of the sensors connectors in rear bumper will be next!
If the module is receiving 12 V+ Power and is grounded( A working
module should be showing in the network list with DTC’s if these and ISO
wiring are good) and sensor wiring and connectors check out then the
module communication wires from the PAM module Connector to the
Display’s connector and to the DLC Pin number 7 will be the next to
check as the Display gets the PAM signal from the PAM module over the
ISO network.
If You say you have Service manual then You are about to make good use of it!
It should have wiring and connector Diagrams and a Pin Point flow chart in it!
If the PAM module is receiving 12V+ and has a ground connection the
sensor connections check out(sensors and connectors are prone to
moisture and corrosion) and the Display and PAM module’s ISO Connection
to No7 DLC Pin all check out then you have a PAM module that has
probably died!
It does Happen!
Good luck! Hope this is of some help?
Question:
Thanks for the feedback. The manuals are helpful except, in this case
a bit confusing. In the Module Comunications Network section it says
the PAM is on the UBP network and refers me to the Parking Aid section
in the same manual, but in that section it clearly says the PAM is on
the ISO 9141 network as I mentioned above. I do see the Restraint
Control Module (RCM) show up so I guess I do have access to ISO9141.
As for truck vs car – I have noticed the Panther platform (Crown Vic,
Grand Marquis, Town Car) seems to “borrow” a lot of components from the
truck lines, esp. Explorer. Maybe it’s the similarities in construction
and drive line.
Answer:
You are not alone in the confusion you are experiencing! I ran into
this same predicament with my 03 Expedition. The Wiring manual I have
shows the PAM in Module communications on the UBP (Violet Wire) network
but Forscan reads it on the ISO(Light Blue/White wire) network and the
Service manual says PAM is on the UBP network.
It seems that even Ford is confused about this!
If your TC has Climate Controlled Seats and you are not seeing them
on the network list they may also be on the UPB network as are mine in
the Expy.
If Pin 3 shows any voltage(5 V+ Key on in my Expy) to ground (Pin 4
or 5 in the DLC) you may have a UPB network and PAM may be on it in this
case and that is only available with A VCM2 in Forscan. Never have
tried with anything else except VCX Nano and that was an exercise in
futility. Never got it to connect at all to either of these “Old Guys”!
Had to go for a VCM2 Clone (Used it to help the team get UBP support
working back in Version 2.3.09) and it has been good so far! Getting
hard to find a good one of those unfortunately.
Only other way to tell, and you may be going in there in any case, is
to to gain access to the PAM Module connector and see what wire colours
are going into the Module Communications pin. Violet likely means UBP,
Light Blue/White means ISO, at least it is in the two trucks (03 Expy
and 05 F150) I have here, but your TC wiring Diagram may differ!
Question:
Yea “FORD Engineered” is sometimes a complement and sometimes a curse..
