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With RPO UQ7 1. Speaker output circuit from amplifier shorted-Test the appropriate speaker output circuits for a short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs . 2. Replace the amplifier. Refer to Radio Speaker Amplifier Replacement. Without RPO UQ7 Front Speakers Inoperative 1. Speaker output circuit from amplifier shorted-Test the appropriate speaker output circuits for a short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs . 2. Replace the amplifier. Refer to Radio Speaker Amplifier Replacement. Rear Speakers Inoperative 1. Speaker output circuit from amplifier shorted-Test the appropriate speaker output circuits for a short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs . 2. Replace the amplifier. Refer to Radio Speaker Amplifier Replacement. With RPO U2K 1. Audio signal circuit open-Test the appropriate audio signal for an open. Refer to Circuit Testing and Wiring Repairs . 2. No audio output from the digital radio receiver-Replace the digital radio receiver. Refer to Digital Radio Receiver Replacement and Digital Radio Receiver Setup. 3. No digital output from the radio-Replace the radio. Refer to Control Module References for replacement, setup and programming. UNABLE TO CONTACT ONSTAR CALL CENTER Diagnostic Aids The customer concern may have been due to a lack of cellular service in a given area. A IMPORTANT: With RPO Y91, Bose amplifier, perform the setup procedure for the amplifier. Refer to Audio Amplifier Setup. IMPORTANT: The following procedure assumes all speakers are operative for all modes of operation except digital radio.
2007 Hummer H3 2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3
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