tow bar electrics not working

[40apple40]

[FONT=verdana]i have an 05 1.8t vector convertible fitted with detachable tow bar (by saab a few years ago).[/FONT]

[FONT=verdana]i've used the tow bar for my bike rack but never used (or checked) the electric socket for it.[/FONT]
[FONT=verdana]i want to use it so checked to see if it was working using a digital multimeter.[/FONT]

[FONT=verdana]no functions are working though. only the 12v from ignition & the permanent 12v is there.[/FONT]

[FONT=verdana]as i've never used it i don't know if it's ever worked since fitted.[/FONT]
[FONT=verdana]i checked the fuses in the rear fuse box (control module or rear electrical center) & all are ok. 12v power is also at the relevant fuses.[/FONT]

[FONT=verdana]there is a trailer control module plugged into the rear fuse box (control module or rear electrical center). this has a circuit board inside & so don't think can be fault finded (if there is such a word). i'm not too sure what this does but the voltages for the trailer lamps come from it i believe.[/FONT]

[FONT=verdana]does the tech II thing have to be enabled for the trailer functions to work? if so i'm thinking this may not have been done at the dealer when fitted.[/FONT]
[FONT=verdana]only other thing i can think of is that the trailer module isn't working - seems strange though as it was new when fitted & has never been used since.[/FONT]

[FONT=verdana]any one have any ideas what else i can check or do to get it working/[/FONT]

[FONT=verdana]thanks.[/FONT]

[Burnsside42]

when that kit is installed - harness, module it does have to be programmed into the REC (Rear Electrical Center) by a Tech2. If all check outs ok - it's either the module or the REC which has gone bad.

[40apple40]

when that kit is installed - harness, module it does have to be programmed into the REC (Rear Electrical Center) by a Tech2. If all check outs ok - it's either the module or the REC which has gone bad.

thanks for the info.

the dealer will charge me just to check the tech II which i was hoping to avoid.

i have a strong feeling that they didn't set up the tech II thing when they fitted it ( a few years ago now)

not to sure what to do now.