2004 xc70 195k km brake failure warning repair advice

[HRPufNStuf]

I got the dreaded brake failure light on my daughters 2004 xc70.
Plugging into my VIDA, I get

BCM-0074 hydraulic valves faulty signal
DDM-002B Mirror motor MC signal too low
PDM-0027 Mirror motor MY+ signal too low
CEM-6F71 Fuel hatch switch signal too low
PDM-0025 mirror motor signal missing
PDM-0030 rear view mirror potentiometer faulty signal
PDM-0032 rear view mirror potentiometer faulty signal
PDM- 0040 outside temperature sensor signal too high
UEM-0004 siren communication fault
UEM-0005 sunroof communication fault.

I?ve recently replaced a side mirror and the alarm siren with good used ones and never cleared those codes a few months ago.
As car was my elderly mothers and had sat indoors for over a year undriven, I replaced front calipers and front hoses and new pads/ rotors all around.

The brake failure code came on a few weeks ago when my daughter was driving. Told her to park it till I got home ( I?m military and home for a few days from a deployment before heading out again tomorrow) no other symptoms on the dash/ DIM. Odometer and all functions on dash work. When I pulled into the garage this morning, code is not showing ever though I have nor cleared any codes. Also while I had it he ignition in #2 position pulling codes, it sounded like a pump cycling on and off under the hood for a few minutes?the hydraulic pump?

I see Kyle had a similar fault and the xemodex repair appeared to sort it out?

http://forums.turbobricks.com/newreply.php?do=newreply&p=4472738


Anyone have any additional advice?
Should I pull the module and send to xemodex and just roll the dice?
I assume the car is undriveable without the module installed?

Patrick

 

[ZVOLV]

Do fault diag for Brake Module code 0074. It could be the Module, the component, or possibly wiring/other electrical issue.

Pump noise could be the ABS motor doing diag.

 

[HRPufNStuf]

Do fault diag for Brake Module code 0074. It could be the Module, the component, or possibly wiring/other electrical issue.

Pump noise could be the ABS motor doing diag.

Thanks.
Not sure how you do that in VIDA?
Im good on the code reading and real time monitoring, but did not know you could conduct targeted diagnosis of codes?
Patrick

 

[ZVOLV]

It's probably a common issue. I'd punch that codes into a published diagnostics program like all data, Mitchell, etc and see what the common fixes and diagnostic procedures are.

 

[HRPufNStuf]

It's probably a common issue. I'd punch that codes into a published diagnostics program like all data, Mitchell, etc and see what the common fixes and diagnostic procedures are.

Thanks,
I thought there was a targeted diagnostic process one could run on each computer through VIDA.
Looking online, it looks like the Brake control module comes up as the 0074.
Seems to have solved itself for the time being. Still logged in faults, but no longer latching the red light warning on the dash. If it comes up again, ill try cleaning the contacts then off of Xemodex

Patrick

 

[ZVOLV]

I would check the ground for that module. Without published diagnostics, you can just do the basics of checking the connections visually. You could voltage drop test and wiggle test. You can check terminal tension with rh proper probes. Clean the ground can't hurt.

Maybe slap some dielectric grease in the connector. Cycle it several times to clean microscopic fretting.