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Home >> Cadillac >> 2017 >> Escalade Base, 4WD >> Repair and Diagnosis (Single Page) >> Body & Frame >> Ignition Switch/Steering Lock >> Wiring Systems And Power Management - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC B144A: Run Power Relay Circuit >> Circuit/System Testing
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Circuit/System Testing

NOTE:

The vehicle may not be equipped with all components as listed below.

  1. Ignition OFF, disconnect the harness connector at the S77 Transfer Case Control Switch, X81 Accessory Power Receptacle - 110V AC, X81B Accessory Power Receptacle - 220V AC, or KR81 Auxiliary Battery Relay 1.
  2. Connect a test lamp between the ignition circuits listed below and ground.
    • S77 Transfer Case Control Switch - Ignition circuit terminal 2
    • X81 Accessory Power Receptacle - 110V AC - Ignition circuit terminal 1 X1
    • X81B Accessory Power Receptacle - 220V AC - Ignition circuit terminal 1 X1
    • KR81 Auxiliary Battery Relay 1 - Ignition circuit terminal 86
  3. Verify the test lamp turns ON and OFF when cycling the ignition between ON and OFF.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the ignition circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
    • If the test lamp turns ON and OFF 
  4. Test or replace the appropriate S77 Transfer Case Control Switch, X81 Accessory Power Receptacle - 110V AC, X81B Accessory Power Receptacle - 220V AC, or KR81 Auxiliary Battery Relay 1.
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