LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Pontiac >> 2003 >> Aztek AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (HVAC Systems - Automatic) >> Symptom Tests >> Test L: Passenger HVAC Control Does Not Operate Properly
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test L: Passenger HVAC Control Does Not Operate Properly

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing system check, go to next step.
  2. Turn ignition ON, engine OFF. Connect scan tool. Observe AUTO HVAC W/DUAL ZONE OPTION parameter in DASH INTEGRATION MODULE (DIM) SET OPTIONS data list. If scan tool indicates, AUTO HVAC W/DUAL ZONE OPTION is active, go to next step. If scan tool indicates AUTO HVAC W/DUAL ZONE OPTION is not active, go to step  6.
  3. Place AUTO control switch in on position. Using scan tool, observe PASS HVAC SWITCH parameter in DRIVER DOOR MODULE data list. Place passenger's air temperature switch in the warmest position. If value of PASS HVAC SWITCH parameter changes, go to next step. If value of PASS HVAC SWITCH parameter does not change, go to step  7.
  4. Connect scan tool. Observe RIGHT PROGRAM NUMBER parameter in INSTRUMENT PANEL MODULE data list. Place passenger's air temperature switch from coldest to warmest position. If RIGHT PROGRAM NUMBER parameter increases, go to next step. If RIGHT PROGRAM NUMBER parameter does not increase, go to step  8.
  5. Place Passenger's Air Temperature Switch in warmest position. Using scan tool, observe RIGHT PROGRAM NUMBER parameter in INSTRUMENT PANEL MODULE data list. Press OFF control knob one time on HVAC control head. If RIGHT PROGRAM NUMBER parameter changes, test for intermittent loose wires and connectors. See INTERMITTENTS  under TROUBLE SHOOTING. If RIGHT PROGRAM NUMBER parameter does not change, go to step  8.
  6. Using scan tool, enable AUTO HVAC W/DUAL ZONE option in DIM set options data list. When complete, go to step  11.
  7. Check for loose wires and/or poor connections at Passenger's Air Temperature Switch and Passenger Door Module. If poor connection is found, repair as necessary. When repair is complete, go to step  11. If poor connection is not found, go to step  9.
  8. Check for loose wires and/or poor connections at Instrument Panel Module (IPM) harness connector. If poor connection is found, repair as necessary. When repair is complete, go to step  11. If poor connection is not found, go to step  10.
  9. Replace Passenger-Side Temperature Control Panel. See PASSENGER-SIDE TEMPERATURE CONTROL PANEL  under REMOVAL & INSTALLATION. When repair is complete, go to step  11.
  10. Replace IPM. See INSTRUMENT PANEL MODULE (IPM)  under REMOVAL & INSTALLATION. When repair is complete, go to next step.
  11. Operate system to verify repair. If condition is corrected, system is okay. If condition is not corrected, go to step  2.
scientia non olet · About LEMON Manuals