Circuit/System Testing: Overview

2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Overview
WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. 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 Ξ© 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
    • Audio common signal (-) - terminal 9
    • 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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.