Battery Going Dead, Replaced A/C Control Module And Actuators – UnderhoodService

Battery Going Dead, Replaced A/C Control Module And Actuators

Shortly after a charging system test, while looking for loose wiring, a clicking noise was found and appeared to be moving throughout the dash in a cycle. The temperature control doors were clicking, attempting to move, but were in fact stuck to one extreme. Scanned the HVAC system and retrieved 3 codes.

Vehicle

2007 Chevrolet Impala LT 3.5L

Complaint

Customer states that battery goes dead while vehicle is sitting

Diagnostic Steps Performed/Parts Replaced

Performed Charging system test and all is normal. Shortly after the test, while looking for loose wiring, a clicking noise was found and appeared to be moving throughout the dash in a cycle. The temperature control doors were clicking, attempting to move, but were in fact stuck to one extreme. Scanned the HVAC system and retrieved 3 codes:

B0223 Recirculate Position Command Circuit Actuator Stuck

B0408 Left Air Mix Control Circuit Malfunction Actuator Stuck

B0418 Temperature Control 2 Circuit Actuator stuck

Cause

Cannot command the motors — replaced 2 of the motors and still cannot command them. Internal failure of the controller causing motors to run with key removed, thus, draining battery.

Correction

Replaced HVAC control module and three bad mode door actuators. No more clicking noise and battery not draining with key off.

Courtesy of Mitchell 1 SureTrack Real Fix

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