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Home >> Isuzu >> 2007 >> Ascender 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 263 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information & Procedures >> Radio Audio Inoperative at Rear Seat Audio (RSA) Control >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Center the balance and fade adjustment on the radio.
    • If adjustment of the fade and balance eliminates the concern, review the operation of the radio with the customer.
  2. Disconnect the X2 connector of the rear HVAC control module. Connect a DMM between the suspect speaker output circuits (input to the RSA) from the radio. Turn ON the radio and verify there is AC voltage present.
  3. Test or repair open, short to ground or short to voltage on the RSA ground circuit and battery positive voltage circuit.
    • If all circuits test normal, replace the rear HVAC control module.
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