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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC B0183 or B0188 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 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 sunload sensor.
  2. Test for less than 1.0 ohm between the ground circuit terminal C and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the appropriate scan tool Sunload Sensor parameter is greater than 250 counts.
    • If not the specified value, test the appropriate signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the HVAC control module.
      • Left sunload sensor circuit terminal A
      • Right sunload sensor circuit terminal B
  4. Install a 3A fused jumper wire between the ground circuit terminal C and the signal circuit terminal of the appropriate sensor listed below. Verify the appropriate scan tool Sunload Sensor parameter is less than 5 counts.
    • Left sunload sensor circuit terminal A
    • Right sunload sensor circuit terminal B
    • If not the specified value, 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 sunload sensor.
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