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Home >> Chevrolet >> 2019 >> Suburban 3500 HD LS >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel Trim And Console Trim >> Diagnostic Information and Procedures >> DTC B324D >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. 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, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance, replace the K9 Body Control Module.
    • Go to next step: If the test lamp illuminates 
  3. Ignition OFF and all vehicle systems OFF, disconnect the X2 harness connector at the X51R Fuse Block-Instrument Panel Right. It may take up to 2 minutes for all vehicle systems to power down.
  4. Test for less than 10 Ω between the ground circuit terminal 22 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 
  5. Ignition OFF, connect the X2 harness connector at the X51R Fuse Block-Instrument Panel Right. Disconnect the X1 harness connector at the K9 Body Control Module, ignition ON.
  6. Verify the M91 Instrument Panel Compartment Door Unlatch Actuator is not activated.
    • If the M91 Instrument Panel Compartment Door Unlatch Actuator is activated 
    1. Ignition OFF, disconnect the X1 harness connector at the X51R Fuse Block-Instrument Panel Right.
    2. Test for less than 1 V between the K9 Body Control Module control circuit terminal 6 X1 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the X51R Fuse Block-Instrument Panel Right.
    • Go to next step: If the M91 Instrument Panel Compartment Door Unlatch Actuator is not activated 
  7. Connect a 3A fused jumper wire between the control circuit terminal 6 and B+.
  8. Verify the M91 Instrument Panel Compartment Door Unlatch Actuator activates.
    • If the M91 Instrument Panel Compartment Door Unlatch Actuator does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X51R Fuse Block-Instrument Panel Right, ignition ON.
    2. Test for infinite resistance between the K9 Body Control Module control circuit terminal 8 X4 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 X51R Fuse Block-Instrument Panel Right.
    • Go to next step: If the M91 Instrument Panel Compartment Door Unlatch Actuator activates 
  9. Replace the K9 Body Control Module.
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