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Home >> Chevrolet >> 2012 >> Cruze LS, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 253 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B1278 or B1279: Auxiliary Input Signal Circuit >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2011 Chevrolet Cruze. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the auxiliary audio jack.
  2. Ignition ON, test for less than 1 V between the terminals listed below and ground:
    • signal terminal 1
    • signal terminal 2
    • If greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the multimedia player interface module.
  3. Ignition OFF, test for infinite resistance between the terminals listed below and ground:
    • signal terminal 1
    • signal terminal 2
    • If less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the multimedia player interface module.
  4. If all of the circuits test normal, replace the auxiliary audio jack.