Focus Mk3 - Car alarm trigger: 'Start Attempt' and OBD2: Ignition Relay fault

[Shahman]

Hi all, I'm making a new post because I no longer suspect a battery drain triggering my car alarm.

However I'm still having something trigger my alarm erratically and a I do have a drained battery.
Now I suspect the alarm is draining the battery when it is going off constantly. As i've carried out parasitic drain tests and not found any drain occuring.
I've even replaced the battery to no avail.

New findings:

OBD2 Alarm Trigger cause history: 'Start Attempt'

 

OBD2 DTCs of concern:

PCM
U0001 - High Speed CAN Communication Bus
P086E - Neutral Position Sensor A Circuit Intermittent/Erratic [?]
P086D - Neutral Position Sensor A Circuit High [?]
P086E - Neutral Position Sensor A Circuit Intermittent/Erratic [?]

OBDii
U0001 - High Speed CAN Communication Bus [Confirmed - malfunction is confirmed]

BCMii
B10A2 - Crash Input [General Signal Failure]
B10E7 - Ignition On Relay [Circuit Short To Battery]
B10E7 - Ignition On Relay [Circuit Short To Ground Or Open]
U0131 - Lost Communication With Power Steering Control Module A
U0151 - Lost Communication With Restraints Control Module
U0010 - Medium Speed CAN Communication Bus [Bus Off]

 

I've checked the R15 relay in the fusebox - it seems to be fully operational as intended.

Where else should i look, or any idea as to what these faults could mean?

 

I'd attached the fully OBD2 DTC report.

 

Thanks again!

DTCs 31072020 .txt

[Shahman]

Anyone willing to check or know what the voltage readings of the pins in R15 ignition relay wrt to ground are?

Im suspecting a ground fault or something... I looked at the wiring diagrams but couldnt make much sense were the pins were going...

And is there a  cable loom under the fusebox in a mk3? cant find the cable that connects the relay to the battery...

 

anyone good with these wiring diagrams?

I understand 14K733 is the engine bay cable loom - and C1BB01-A/B are the terminations to  the eyelets for the prefusebox but I cant find what C1BP02D is...

My next check will be KL15 RELAY CTRL in the BCM- that might be haywire...

 

[Kevin#95]

R16 is the ignition relay. If it is the same as R15 (rear window defrost) you can swap them to check they work.

I don't know why they called the R16 relay ignition 15, it confuses things.

[Shahman]

Sorry yes I meant the R16 relay. I do not have a R15 for some reason although I do ha e rear defrost on my car...

 

Does anyone know what the KL15 relay is in the BCM is?

[Shahman]

Anyone got some ideas?

[AliD]

Hi @Shahman - Did you resolve this?  I appear to have the same issue.  Cheers.

[strathearnd]

was there ever a solution i am having exact same issues currently