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Home >> Cadillac >> 2019 >> CTS V >> 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/Vehicle - Off
  2. Disconnect the electrical connector:X2@K9 Body Control Module
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify a test lamp turns On between the test points:B+ circuit terminal 3 X2 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points: K9 Body Control ModuleB+ circuit terminal 3 X2@Output terminal @F3DA Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for infinite resistance between the test points:B+ circuit terminal 3 X2 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:K9 Body Control Module
    • Go to next step: If the test lamp turns On 
    5. NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  5. Ignition/Vehicle & All vehicle systems - Off
  6. Connect the electrical connector:X2@K9 Body Control Module
  7. Remove the component:KR147 Instrument Panel Compartment Door Unlatch Actuator Relay
  8. Test for less than 10 ohms between the test points:Ground circuit terminal R-13 & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points:Ground circuit terminal R-13 & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  9. Connect a test lamp between the test points:Control circuit terminal R-15 & Ground circuit terminal R-13
  10. Ignition - On / Vehicle - In Service Mode
  11. Operate the component:S48D Multifunction Switch 2 - Instrument Panel - Pressed

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:K9 Body Control Module
    3. Test for infinite resistance between the test points:Control circuit terminal R-15@Relay Socket & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points:Control circuit terminal R-15@Relay Socket & Control circuit terminal 6 X1@Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K9 Body Control Module
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:K9 Body Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Control circuit terminal R-15@Relay Socket & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:K9 Body Control Module
    • Go to next step: If the test lamp turns On and Off 
  12. Test or replace the component:KR147 Instrument Panel Compartment Door Unlatch Actuator Relay
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