Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Buick >> 1995 >> Roadmaster Base >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> A/C-Heater System - Automatic >> Self-Diagnostics >> Code 05 - SUNLOAD Sensor Circuit Open

Code 05 - SUNLOAD Sensor Circuit Open

  1. Turn ignition switch to RUN position. Enter diagnostics and select pointer number "-02". Check for Diagnostic Trouble Codes (DTCs). If trouble codes "01," "03" and "10" are also present, repair open in Yellow wire from temperature sensor to A/C-heater control unit connector terminal D1. See Figure. Press OFF switch. Exit diagnostics.
  2. Turn ignition off. Disconnect sunload sensor connector, located under center windshield defroster grille. Turn ignition on. Measure voltage between ground and sensor harness connector Light Blue/Black wire. If voltage is between 4.5-5.5 volts, go to next step. If voltage is more than 5.5 volts, check Light Blue/Black wire for short to power. If wire is okay, replace A/C-heater control unit.
  3. Check for continuity to ground at harness connector terminal "B" (Light Green/Black wire). If continuity does not exist, repair open circuit in Light Green/Black wire. If continuity exists, replace sensor.
scientia non olet · About Mike's Workshop Manuals