NHTSA ID Number: 10089571 Manufacturer Communication Number: 15663   Summary 15663 – SERVICE UPDATE. THIS BULLETIN PROVIDES A SERVICE PROCEDURE TO RELOCATE A WIRE CIRCUIT WITHIN THE ONSTAR CONNECTOR ON CERTAIN VEHICLES. THESE VEHICLES LACK A GROUND IN THE MICROPHONE RETURN PATH, WHICH RESULTS IN THE VOICE RECOGNITION BECOMING INOPERABLE WHEN THE VEHICLE IS IN RETAINED ACCESSORY ... Read more

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