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Circuit/System Testing: Overview

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the PAL module.
  2. Test for less than 5 Ω between terminal 9 and ground.
    • If greater than specified value, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between terminal 16 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  4. Ignition OFF, reconnect the harness connector at the PAL module.
  5. Disconnect the X2 harness connector at the radio.
  6. Radio ON, iPod sourced and playing, test for a varying mV AC voltage between the following signal circuit terminals listed below and ground.
    • Left audio signal (+) - terminal 1
    • Right audio signal (+) - terminal 2
    • Left audio signal (-) - terminal 9
    • Right audio signal (-) - terminal 10
    • If the varying mV A/C voltage is not present, test the signal circuit for a short to voltage, short to ground, or an open/high resistance. If the circuits tests normal, replace the PAL module.
  7. If all circuits test normal, replace the radio.
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