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I've just connected a gmos-01 harness adapter to a sony cdx-gt630ui car radio for a 2002 gmc envoy and the radio comes on but there's not sound from the speakers.

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This is because speakers connections are not correct in gmos-01 harness.
You should check and confirm harness speaker connections as per CDX-GT630UI harness mentioned in user manual.

Posted on Feb 12, 2009

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