Tribute 4WD L4-2.5L Hybrid (2009)
Control Module HVAC: Customer Interest
A/C - Lack Of Cooling Performance
Bulletin No: 07-002/11
Last Issued: 03/16/2011
SUBJECT:
LACK OF A/C COOLING
APPLICABLE MODEL(S)/VINS
2009 Tribute Hybrid
DESCRIPTION
Some vehicles equipped with electronic automatic temperature control (EATC) may exhibit a lack of A/C cooling. Low battery voltage during a previous
vehicle start may cause the heating ventilation air conditioning (HVAC) module to function in conventional gasoline mode instead of hybrid vehicle
mode.
Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
1. To determine if the HVAC control module has defaulted to gasoline mode, first turn off the A/C and Recirculated Air buttons on the HVAC control
head.
2. Turn off the HVAC control head.
3. Press the ECON button, the yellow led will light up.
4. Does the A/C and recirculated air buttons also light up when the ECON button is pressed?
a. Yes - HVAC module is in gasoline mode, proceed to Step 5.
b. No - HVAC module is not in gas mode, this procedure does not apply.
5. Reboot the IDS to clear memory before reprogramming.
6. Using IDS 71.00 or later software, reprogram the HVAC to the latest calibration by following the "Module Reprogramming" procedure.
NOTE:
^ Always update the IDS tool first, then follow on-screen instructions to download the needed calibration file for HVAC reprogramming.
^ It is not necessary to remove any fuses or relays during HVAC reprogramming when the IDS screen prompts you to do so. You may accidentally stop
power to one of the HVAC terminals and cause the HVAC to be blanked, or you may receive error messages during the IDS reprogramming
procedure.
^ IDS shows the calibration part numbers after programming the HVAC.
^ Please be aware that HVAC calibration part numbers and file names listed in any Service Bulletin may change due to future releases of IDS software,
and additional revisions made to those calibrations for service related concerns.
^ When reprogramming a HVAC, IDS will always display the "latest" calibration P/N available for that vehicle. If any calibration has been
revised/updated to contain new information for a new service concern/issue, it will also contain all previously released calibrations.
^ When performing this procedure, we recommend that a battery charger be installed on the vehicle battery and turned ON to a maximum charge of no
more than 20 AMPS to keep the vehicle battery up to capacity. If you exceed 20 AMPS, it could damage the VCM.
7. After performing the HVAC reprogramming procedure, verify the repair by starting the engine and making sure there are no MIL illumination or
abnormal warning lights present.
NOTE:
^ If any DTCs should remain after performing DTC erase, diagnose the DTCs according to the appropriate Troubleshooting section of the Workshop
Manual.
