IIRC, for pioneer radios, the purple wire is most likely the reverse trigger wire. The orange for the dimmer circuit and the green for parking brake. Should be able to pull out the headlight switch to double check that one. The other two may be behind the drivers kick panel or in the convenience...
I say differently. I installed an aftermarket head unit and I’m still able to use the factory rear entertainment system.
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Recently changed to an aftermarket h.u. myself and went thru a couple different adapters.
IDatalink only offers swc for 03-06. So only other options would be PAC rp5-gm11 or the Axcess gmos-04.
I have an 03 Yukon XL Denali with premium Bose amp. I liked using the gmos-04 except that it doesn’t...
From what I understand the dash in the 99-02 models are different so it’s not possible. Might be possible if you change the dash? Someone with more hopefully chimes in...
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