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Home >> Chevrolet >> 2016 >> Spark LS, Standard Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System, And Navigation System >> Diagnostic Information and Procedures >> DTC B1446 or B1447: Replace Backup Power Source Below Minimum Threshold/Backup Power Source Open Circuit >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF/Vehicle OFF and all vehicle systems OFF, disconnect the X1 harness connector at the K73 Telematics Communication Interface Control Module. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for greater than 12.3 V between the B+ circuit terminal 14 and the low reference circuit terminal 13.
    • If 12.3 V or less 
    1. Disconnect the C3 Telematics Communication Interface Control Module Battery.
    2. Test for infinite resistance between the circuits listed below and ground.
      • B+ circuit terminal 14
      • Low reference circuit terminal 13.
        • If less than infinite resistance, repair the short to ground in the circuit.
        • If infinite resistance.
    3. Test for less than 2 Ω in the circuits end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the C3 Telematics Communication Interface Control Module Battery.
    • If greater than 12.3 V 
  3. Replace the K73 Telematics Communication Interface Control Module.
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