Where is BCM wire for Reverse Lights - '09 LTZ w/4WD

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July 3rd, 2024, 11:01 PM

#11

jfmorris

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Quote:

Originally Posted by mountainmanjoe

there's already a relay on x2:22
if you put one in series, you may not get enough voltage to operate either of them. If you put one in parallel, you may overload the circuit. You also need to protect against voltage spikes from relays per the technical bulletin I mentioned. just FYI.

As an electrical design engineer, I have to second this advice. You are better off using X3 pin 24 i.e. the output of the existing relay. If you try to tie a second relay directly to the output of the BCM you risk preventing both relays from actuating, and risk potential damage to the BCM output as well. I guarantee the output of the BCM itself was not designed to source the current for two relay coils. And if you force it to do so, the output transistor or circuit will be running hotter.