New Interior Light Wiring Loom Install - Key Not Detected

[Fletch76]

Help needed please......... There's a bit of a story so bare with me please.

I own a Focus Sport 2.0 Diesel on a 60 plate.

It has a keyless entry/start system.

Here's the problem......

I wanted to add a rear (interior) light so that when putting my son in his car seat I could see what I was doing.

I know I could've gone down the splicing route but,

A) I didn't have a clue how to do this

and

B) I didn't fancy cutting into the original loom as I wasn't confident.

With that in mind I went to Gates of Harlow (Ford Main Dealer) and I purchased a new interior light wiring loom - which is for the Focus Titanium 2.0, the same year 2010, with keyless entry/start - this loom provided me with the wiring for the rear light and also vanity lights (the sport loom just has wiring for the front light only) the new loom works fine (all the lights work) however, the first problem is now the car isn't recognising the key, I've tried the spare key and it's the same.

After further investigation it looks like the key isn't recognising the little black sensor in the roof lining or vice versa although when I put the original loom back everything works fine again. From what I've read on the net it looks like that perhaps the key(s) need(s) to be reprogrammed to the car to accommodate the new wiring loom? With this in mind I took the plastic ignition cap off only to find another black plastic surround with a slot for the key, but here's the other problem the key (on both sets) doesn't work in the ignition (the key will not turn) but the key(s) unlock the doors and bonnet with no problems, so am I missing a key specifically designed for the ignition only? or does this other plastic cover need to be removed with a bit of force in order to expose the metal ignition barrel?

Going back to why the key is not being detected......I've looked at the new loom and compared it to my old one and all the wires that are on the connector blocks (which plug into the fuse box) are the same colours and all the wires are in the same positions on the block connector, so on that basis the lead is the correct one.

I hope I've made sense? In short the dash is showing key not detected with the new loom even though it appears to be the correct one, as a result it looks like the key needs to be reprogrammed but neither key fits the ignition.

Any help would be much appreciated,

Thanks,

Stuart

[Preee]

Hi Stuart.

On the Steering rack , there is no actual ignition barrel for keyless entry , by pulling off the cover this allows for the whole fob to be placed into the slot , this allows the sensor to be picked up inside the key for starting.

I guess even though the loom looks the same , there could be a fault on it have you got a circuit tester to test each wire?

Is the Sensor connected to the new Loom? , if so then perhaps yes it would need coding.

The easy way around this would be to cut the added section of the loom for the light off and attach it to the original loom to get the extra light.

[Fletch76]

Thanks for the reply.

I'm pretty sure there isn't a fault on the loom as all the lights work? and yes new loom is plugged into the sensor.

This is what I've found when taking the cap off the ignition....

Which doesn't look right based on your description?

Thanks Again,

Stuart

[SuperSixFour]

I have a mk2.5 with keyless entry and it looks the same as the picture above. You don't insert the whole fob for mine you just hold it against it and start the car.

The handbook does list two types though, one you just hold the fob against the cover and the other involves inserting the whole fob as Preee says.

[Preee]

Thanks for the reply.

I'm pretty sure there isn't a fault on the loom as all the lights work? and yes new loom is plugged into the sensor.

This is what I've found when taking the cap off the ignition....ImageUploadedByFord OC1387711540.663184.jpg

Which doesn't look right based on your description?

Thanks Again,

Stuart

Ops sorry i was thinking of the Mk3 , inside your remote is the key to open the bonnet this same key slides into the barrel , it does not turn , then holding the fob close to the barrel it should then start off the button.

When you say the loom is connected to the sensor , is it a new sensor or the original sensor.

[Fletch76]

The original loom works when connected to the original sensor, but as soon as the new loom is connected to the original sensor it doesn't work.

[Preee]

Mayber where the loom plugs in the wiring pins are different

[Fletch76]

No, there all in the same positions, I checked.