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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC B0163 or B3933 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate temp sensor.
  2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit and the low reference circuit terminal of the appropriate sensor listed below.
    • DTC B0163 passenger compartment temperature sensor circuit terminal D.
    • DTC B3933 evaporator temperature sensor circuit terminal B.
    • If greater than the specified range, test the low reference circuit terminal for an open/high resistance. If the circuit tests normal, replace the HVAC control module.
  3. Ignition ON, verify the appropriate sensor parameter is greater than 215°C (419°F).
    • If less than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the HVAC control module.
  4. Install a 3A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal of the appropriate sensor listed below. Verify the appropriate temperature sensor parameter is less than -36°C (-38°F).
    • DTC B0163 passenger compartment temperature sensor circuit terminal D.
    • DTC B3933 evaporator temperature sensor circuit terminal B.
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HVAC control module.
  5. If all circuits test normal, test or replace the appropriate temperature sensor.
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