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

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Vehicle

2007 Chevrolet Impala LT 3.5L

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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.

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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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