Fault codes

[conman]

Hey guys, not the most technical minded and need a bit of help with the meaning of these fault codes if some kind soul could interpret them.
I have a "Check Safeguard" warning for a while now and was wondering if one of these codes have something to do with it. I had checked internal sensors by not activating them and made no difference plus the alarm works fine and not going of randomly etc. Also if I don't lock the car and don't activate the alarm the "Check Safeguard" warning still comes up every time I put in the key and turn the ignition on. Just for reference I have a 2002 Vectra C 2.2 DTI 16v and the head unit is removed as I use my own stereo.

Here's the codes I'm getting:

U2105-71 CAN-Bus ECM Message Range/Performance (This one keeps coming back after code cleared)
B3916-0F No Communication With Alarm Siren
B3596-00 Invalid Trouble Code Please Ignore!
B1375-00 Switched System Voltage (Ignition ON) Circuit Malfunction
B3974-05 Driver Door Select Switch Window Lifter Circuit Open or High Voltage (Present)
B1325-03 System Voltage Low Voltage
U1420-04 Radio Bus Communication SDA open (Present)
U1421-04 Radio Bus Communication SCL open (Present)
U1422-04 Radio Bus Communication MRQ open (Present)
B3608-06 <Unknown DTC>

[fistymus]

B3916-0F No Communication With Alarm Siren

Most likely the culprit, as per here:

http://www.vectra-c.com/forum/showth...light=B3916-0F

[conman]

Cheers mate, will check the fuses and the battery backup in the sounder and see if I discover anything. Any ideas what the other codes are or would these all be because of the "Check Safeguard" error?

[conman]

I went out and took a photo, I checked all the fuses and they were all ok. Can anyone tell me if this looks right? Seems like there are a load of fuses missing.

[DTi Elite]

there will be fuses missing as different models have different equipment , so have fuses in different slots .

[fistymus]

B1375-00 Switched System Voltage (Ignition ON) Circuit Malfunction
...and...
U1420-04 Radio Bus Communication SDA open (Present)
U1421-04 Radio Bus Communication SCL open (Present)
U1422-04 Radio Bus Communication MRQ open (Present)

The top one is likely due to the missing original head (They have the ignition On/Off setting)

The bottom three deffo are.

From odb-codes.com:

U2105:
When the ECM stops communicating, the SOH that is normally sent every 2 seconds, disappears. The module that should receive that message detects the absence of the message and in turn sets DTC U2105.

[conman]

The bottom three deffo are.

From odb-codes.com:

U2105:
When the ECM stops communicating, the SOH that is normally sent every 2 seconds, disappears. The module that should receive that message detects the absence of the message and in turn sets DTC U2105.

So don't this just mean a communication error between the ECU and the interface or something more serious?

[fistymus]

Could be a bad connection... Time for switch cleaner methinks

[conman]

I think you might be right mate, I know I have some somewhere