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Home >> Buick >> 2013 >> Verano Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 194 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B1278 or B1279 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2012 Buick Verano. 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 X83 auxiliary audio input. Ignition ON, radio ON.
  2. Test for less than 1 V between the signal circuits listed below and ground:
    • left auxiliary audio signal circuit terminal 2
    • right auxiliary audio signal circuit terminal 4
    • auxiliary audio common signal circuit terminal 5
    • If 1 V greater 
    1. Ignition OFF, disconnect the harness connector at the T11 multimedia player interface module. Ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the T11 multimedia player interface module.
    • If less than 1 V 
  3. Ignition OFF, disconnect the harness connector at the T11 multimedia player interface module.
  4. Test for infinite resistance between the signal circuits listed below and ground:
    • auxiliary audio common signal circuit terminal 3
    • left auxiliary audio signal circuit terminal 12
    • right auxiliary audio signal circuit terminal 13
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  5. Test for less than 5 Ω between the signal circuit terminals listed below:
    • T11 multimedia player interface module X1 terminal 3 and the X83 auxiliary audio input X1 terminal 5
    • T11 multimedia player interface module X1 terminal 12 and the X83 auxiliary audio input X1 terminal 2
    • T11 multimedia player interface module X1 terminal 13 and the X83 auxiliary audio input X1 terminal 4
    • If 5 Ω greater 

      Repair the open/high resistance in the circuit.

    • If less than 5 Ω 
  6. Replace the X83 auxiliary audio input. Connect all harness connectors.
  7. Connect and operate the portable audio playback device.
  8. Verify DTC B1278 or DTC B1279 is not set.
    • If DTC B1278 or DTC B1279 is set 

      Replace the T11 multimedia player interface module.

    • If DTC B1278 or DTC B1279 is not set 
  9. All OK.
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