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Alarm - Interior Scan Sensors Retrofit
|How long does this take?||40-60 mins ish|
Facelift model GEM unit ( one that has the interior scan function in it as there are early facelift models without interior scan functions )
Interior light unit with scan sensors
Interior scan sensor connector plug ( with a decent length on cable attached )
GEM unit connector plug ( with a decent amount of cable attached )
Around 3-4m of cable ( i used a pair of wires from an old computer network cable )
4x butt crimps
Small flat screwdriver
T25 Torx Bit Screwdriver
Philips Head Screwdriver
Remove 2 connection pins from the GEM unit connection plug.
Measure up enough wire to reach from the interior light unit in the roof along the front of the roof panel & then down the A-pillar trim & then down to the GEM unit. ( you will need 2 of these lengths )
Connect these 2 lengths to the relevant wires of the sensor unit connection plug at one end ( see piccies further down this how-to for the wires ) & then the other end to the 2 GEM connection pins removed earlier & mark them accordingly for what connector hole they will go into.
Using a small flat blade screwdriver unclip the current interior light unit from the roof console ( there is a small gap at the windscreen side of the light unit for this very task )
Unplug the light unit from the roof loom.
unscrew the sun visor & the sun visor clasp from the roof at the drivers side ( UK - other countries its whichever side your GEM unit is on ) - the sun visor clasp needs a small cover prising off before you can access the screw below it .
Remove the A-Pillar trim on the drivers side of the car.
Remove the Lower dash panel on the GEM side of the car ( UK drivers side & is 5 philips head screws holding it inplace )
Now feed the GEM side wiring you made earlier down the hole in the dash where the A-Pillar trim used to be & feed it down to the GEM unit area making sure its not in the way of anything essential & its secured as required ( make sure to leave a little spare to allow you to work with the GEM unit later etc )
Now feed the top half up the A-Pillar & into roof above the headlining.
Finally Feed the last bit of wiring along the front of the roof lining & to the interior light opening in the roof console ( the reason for removing the sun visor as it much easier to do with that removed )
Once the wire is routed you can put the A-pillar trim & lower dash surround back in place if you wish
Plug the new wiring loom into place ( making sure to put the earth onto the required connector pin on the interior light unit & then plug in the interior light unit to the roof loom ( trapping the earth wire for the alarm sensor - if you wish you can connect this wire up in a different way.
Fit the new interior light unit back into the roof cosole.
Replace your GEM unit with the new unit as follows :-
- Unclip old GEM module from in the drivers footwell.
- Put the new GEM unit in the same alignment/direction as the old GEM unit.
- Remove the plugs from the old GEM unit one at once & once removed fit the plug into the same slot in the new GEM unit ( apart from the one plug that is shown later in the piccy ).
- Take the top cover off the pictures GEM plug & insert the 2 new pins into the slots they go into ( should have already numbered the wires ).
- Put the plug back together & fit it into the new GEM unit.
- Put the new GEM unit back into place & make sure it clips back into place properly.
Pictures of the fittings & Wiring Info
Wiring at the GEM
Wiring at the Sensors on the light unit
To test the Sensors i did the following.
Sit in the rear drivers side footwell behind the drivers seat ( probably not required but i wanted to be out of the way of the sensors vision etc just to be sure )
Now double lock the car using the remote & wait around 30 seconds or so.
After the 30 seconds or so have passed move your arm out from behind the seat & the alarm should trigger ( it did for me )
You could also test it from outside by leaving a window down & then double locking the car before waiting & then sticking your arm into the car through the open window etc ( this way there is a risk the alarm may go off if its a touch windy etc - i know i have had a couple of false triggers when the wind has picked up when i have had the windows down for a prolonged period when its been hot out etc. )