LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2021 >> Tahoe SSV >> Repair and Diagnosis >> Body & Frame >> Windows >> Fixed And MOVEABLE Window System >> Diagnostic Information and Procedures >> DTC B1066 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down.
  2. Disconnect the X1 harness connector at the X53A Body Wiring Harness Junction Block - Rear.
  3. Test for less than 10 Ω between the X53A Body Wiring Harness Junction Block - Rear ground circuit terminal 5 X1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  4. Connect the X1 harness connector at the X53A Body Wiring Harness Junction Block - Rear. Disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
  5. Verify the E18 Rear Window Defogger Grid is not activated.
    • If the E18 Rear Window Defogger Grid is activated 
    1. Ignition OFF, disconnect the X2 harness connector at the X53A Body Wiring Harness Junction Block - Rear, ignition ON.
    2. Test for less than 1 V between the K9 Body Control Module circuit 193 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the X53A Body Wiring Harness Junction Block - Rear.
    • Go to next step: If the E18 Rear Window Defogger Grid is not activated 
  6. Connect a 3 A fused jumper wire between the control circuit terminal 22 X5 and B+.
  7. Verify the E18 Rear Window Defogger Grid activates.
    • If the E18 Rear Window Defogger Grid does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X53A Body Wiring Harness Junction Block - Rear.
    2. Test for infinite resistance between the K9 Body Control Module circuit 193 and ground.
      • If less than Infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the X53A Body Wiring Harness Junction Block - Rear.
    • Go to next step: If the E18 Rear Window Defogger Grid activates 
  8. Replace the K9 Body Control Module.
scientia non olet · About LEMON Manuals