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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 231 (HVAC - Automatic) >> Diagnostic Information and Procedures >> DTC B2A6B-B2A6E (L3B, LSY) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the connector at the A26 Heater and Air Conditioning User Interface Controls - Front. Ignition ON.
  2. Test for 4.8 - 5.2 V between the signal circuit terminal 6 and ground.
    • If less than 4.8 V 
    1. Test circuit 4636 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Test circuit 4636 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found
    3. Replace the K9 Body Control Module
    • If greater than 5.2 V 
    1. Test circuit 4636 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found
    2. Replace the K9 Body Control Module
    • Go to next step: If between 4.8 - 5.2 V 
  3. Replace the A26 Heater and Air Conditioning User Interface Controls - Front.
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