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Tech Tips :: C5 Related Tech Tips :: Upgrade your stock alarm with a shock sensor

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Introduction. I basically followed this post http://www.c5-corvette.com/c5_alarm.htm The only thing I did different was placing the shock sensor against the drive tunnel - still effective but much easier that way. Materials. You’ll need a shock sensor. I’ve used a CodeAlram IR-S shock sensor, which I got from a local CodeAlarm dealer for $30. The sensor has four wires: Black – ground, Red – 12 V, Brown and Yellow are signal wires. The shock operates by grounding signal wires when vibrations are detected. Yellow wire has about half of the Brown wire threshold and it is intended to be used as a warning signal. Wires. You’ll need a piece of gage 16 or 18 hook-up wire about a feet long. Also you’ll need two wires (of any types) to provide power to the sensor. Methods. Open your BCM compartment in the passenger foot-wall. The BCM module is that shiny box you see on the left (picture 1). Pick it up and rotate the connectors towards you. What you need is a pin N 9 in the top connector. The numbering is from the bottom – so the most inferior pin is N1. Just make it easier – the brown wire seen on figure 2 is connected to pin N6. The green wire is where you’ll need to insert your hookup wire. Once you inserted it – you need to test it. Right above the BCM module you should see three wires wrapped in the black tape: orange, yellow and black (Figure 3). The black wire is the ground. Get it out of the pack. To test your pin 9 connection, stay in the car, close all doors and activate the security with your key fob – the security light should disappear from your dash. Next, connect ground wire with your hookup wire, alarm should sound. If you succeeded this far – you’re 90% there. Next unwrap the orange wire from the tape, it should carry +12V. Test it with your voltmeter. Next, supply power to the sensor from the black and orange wires. Touch it – the sensor should light its LED. Next connect your hookup wire to either of the signal wires and test it by locking the car, etc. If it works you’re 95% done. Positioning the sensor. I decided that the wrapping it around the steering shaft does not justify the pain of disassembling all the panels. Instead – you can just lay it against the carpet and the body of the drive tunnel. Just slide it under the carpet to the left of the passenger foot well. I found that even the lightest tap against the windshield activates the alarm. That might be too sensitive for some of you, but the sensor has a sensitivity dial so it can be adjusted to a setting that suites your needs. Figure 1 [IMG]http://www.seanet.com/~mstanzel/vettepic/securit1.JPG[/IMG] Figure 2 [IMG] http://www.seanet.com/~mstanzel/vettepic/securit2.JPG [/IMG] Figure 3 [IMG] http://www.seanet.com/~mstanzel/vettepic/securit3.JPG[/IMG]