2010 SUVs

Chevrolet Suburban 1500 LS

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Q: 2003 Chevrolet Suburban LS 1500 question?
Where is the temperature guage that shows the outside temp on the mirror?

A: Right behind the grill around the rad. support on the passenger side (usually) there is a sensor called an ambient temperature sensor. That gives your outside temp. on your rearview mirror.

Q: Need help with Scosche GMLAN2SR 2000 GM Wiring Harness w/CHIME!?
Okay here is the description for this wiring harness:
This interface will allow you to replace your radio in your 00+ GM vehicle with the class 2 data system.

GM Compatibility by either Class II or LAN Vehicle Applications:
Buick – Century 04-05, Rainier 04-06, Rendezvous 02-05, Terraza 05-up, Lucerne 2007
Cadillac – Escalade/ESV/EXT 2003-2007
Chevrolet – Avalanche 03-07, Blazer S-10 2003, Cavalier 00-05, Colorado 04-07, Express 03-07, Impala 00-07, Malibu 01-03, Monte Carlo 00-05, Silverado 1500/3500 03-06, Silverado 2007, Suburban 03-06, Tahoe 03-07, Trailblazer LS/LTZ 02-06, Venture 00-05
GMC – Canyon 04-07, Envoy SLT 03-06, Savana 03-07, Sonoma 03-04, Sierra 03-07, Yukon/Yukon XL/Denali 03-07
Hummer – H2 2003-06
Isuzu – Ascender 2003-06
Oldsmobile – Alero 2001-03, Bravada 2002-04, Silouette 2000-04
Pontiac – Aztec 2001-05, Grand Am 2001-05

Note: Not compatible with OnStar Systems or for use on Premium Bose Sound Systems

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My question is in regard to the “Note” at the end of the description. I have a 2003 Tahoe Z71 with the Premium Bose system, why would this NOT be compatible? I’m looking to replace the stock in-dash unit with the Pioneer AVIC-F700BT and need to keep all the chimes and everything working, so I would need this wiring harness, but what’s the deal with the Bose system? Why would it not be compatible? Is there any alternative harness that WILL work? Thanks!

A: The Bose has a separate amplifier, with a different harness.
The compatibility issue has to do with the LAN communications. There are a certain number of modules programmed into the BCM memory, and when the LAN is powered up, it looks for the correct amount of modules. If one is missing, it sets a code and can disable other functions.
At the dealership where I work, I have seen the original radio pushed back inside the dash panel, still connected to the harness, and an aftermarket one in the space for the radio,which is then wired up separate from the OEM harness.This allows the chime and all other original functions to operate, but still be able to have the super powerful system in place. Just an observation and a suggestion.

Note: Not compatible with OnStar Systems or for use on Premium Bose Sound Systems

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A: It would NOT be compatible because this adapter still uses the after-market head unit’s amplifier to drive the speakers. Your Trailblazer’s Bose system has its own amplifier. Nor can you use the aftermarket deck’s outputs to connect directly to the Bose amplifier.

Here’s how the “Premium Bose” system in your Trailblazer works: the factory head unit supplies a fixed left and right audio signal to the Bose amplifier. It also generates a control signal through the vehicle’s computer data bus. When you turn up the volume or adjust the fader, it doesn’t change the levels on audio signals between the Bose head unit and Bose amplifier (like most standard Bose systems work). Instead, it sends a data signal to the amplifier telling it to adjust the volume, or adjust the fader settings. Needless to say, the after-market head unit isn’t capable of producing the control data stream that the Bose amp is looking for…and neither is that Scosche adapter.

That particular adapter will work ONLY if you plan to bypass the Bose amplifier and replace the Bose speakers. In this case you can connect the new speakers directly to the head unit, or use an after-market amplifier, and the Scosche adapter will work. However, if you want to keep the Bose amp and speakers in the system, you need an adapter that will take the audio output from the new head unit and convert it to a fixed left/right audio signal and a data control signal, which the Bose amp can use. I’d suggest Metra’s GMOS-04.

Edit: I mis-read the type of vehicle you have. Actually, the Bose system in your Tahoe may be much different from the Trailblazer Bose system I described above. The Bose package in most Tahoe’s is a “standard” Bose system, not a “premium” Bose. If yours is a standard Bose system, then you could use the RCA connectors that come with the adapter to supply the Bose amp from your Pioneer deck’s RCA pre-outs. In this case, the Scosche adapter would work.

Here’s how you can tell the difference: just turn on the factory Bose radio, and adjust the volume. If there’s a slight delay between the time you turn the dial and the time the volume actually adjusts, then you probably have a premium Bose system, and you’d want the GMOS-04. If there’s no perceptible delay, then it’s probably a standard Bose, and the Scosche adapter would work (although the GMOS-04 would work too, and IMO it’s a more reliable product).

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2010 SUVs

Chevrolet Suburban 1500 LS

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