Clicking Sound From HVAC System (Reprogram HVAC Control Module) (11-01-39-001)

Publication date: 2011-04-26
Reference number: 11-01-39-001

CLICKING SOUND FROM HVAC SYSTEM (REPROGRAM HVAC CONTROL MODULE)

TECHNICAL SERVICE BULLETIN

Reference Number(s): 11-01-39-001, Date of Issue: April 26, 2011

Affected Model(s):

2010-2011 Cadillac SRX

CONDITION

Some customers may comment on a clicking sound from the HVAC system. This noise may be heard when the climate control is in the AUTO mode.

NOTE: The sound may appear to be located in the general IP area, and be intermittent in nature.

CAUSE

This condition may be caused by a software anomaly within the electronic climate control module (ECC), which may create excessive noise from the HVAC actuators.

CORRECTION

Reprogram the HVAC control module with the latest software calibration.

IMPORTANT: Select the correct calibration files for the appropriate vehicle configuration (body style) and RPO codes.

NOTE: This software update will not change an unexpected and normal condition which results in three tick sounds that occur when an actuator reaches the end of its travel. The update corrects a more continuous noise.

A revised calibration has been developed to address this condition. Technicians are to reprogram the HVAC control module using the service programming system (SPS) with the latest software available on TIS2WEB. Refer to HVAC System Control Module Programming and Setup in SI.

When using a Tech 2® or a Multiple Diagnostic Interface (MDI) for reprogramming, ensure that it is updated with the latest software version.

During programming, the battery voltage must be maintained within the proper range of 12-15 Volts. Only use the approved Midtronics® PSC 550 Battery Maintainer (SPS Programming Support Tool EL-49642) or equivalent during programming.

WARRANTY INFORMATION

For vehicles repaired under warranty, use:

Warranty Information

Labor Operation	Description	Labor Time
D4707	HVAC System Control Module Reprogramming with SPS	Use Published Labor Operation Time