HVAC Blower Speed Does Not Change After Selecting 'RECIRCULATION' (LTB00421NAS2)

WARNING: This page is about the LR4 Base, which is a different variant/trim than selected.

Publication date: 2012-02-14
Reference number: LTB00421NAS2

HVAC BLOWER SPEED DOES NOT CHANGE AFTER SELECTING 'RECIRCULATION'

TECHNICAL SERVICE BULLETIN

Reference Number(s): LTB00421NAS2, Date of Issue: February 14, 2012

LAND ROVER:	2012 LR4 (LA); 2012 Range Rover Sport (LS)
SECTION:	412
AFFECTED VEHICLES:	LR4 (LA) VIN: CA596988 - CA608751 Model Year: 2012; Range Rover Sport (LS) VIN: CA717166 - CA731558 Model Year: 2012

NOTE: ISSUE '2'

CONDITION SUMMARY

Situation: The Heating Ventilation Air Conditioning (HVAC) blower speed may not change after selecting the 'recirculation' button. This may be caused by the HVAC control module not recognizing messages transmitted from the Front Controls Interface Module (FCIM).

Action: In the event of a customer concern of the above, refer to the REPAIR PROCEDURE outlined below to update the HVAC control module software.

PARTS

No parts necessary

TOOLS

IDS with latest IDS-DVD and Calibration File; first available on IDS-DVD128.02 Calibration File v90 Land Rover-approved Midtronics Vehicle Power Supply

Refer to Workshop Manual for any required special tools

WARRANTY

NOTE: Repair procedures are under constant review, and therefore times are subject to change; those quoted here must be taken as guidance only. Always refer to DDW to obtain the latest repair time.

DDW requires the use of causal part numbers. Labor only claims must show the causal part number with a quantity of zero.

WARRANTY INFORMATION

DESCRIPTION	SRO	TIME (HOURS)	CONDITION CODE	CAUSAL PART
Update HVAC control module software	80.90.12	0.20	42	LR029610

Normal Warranty policies and procedures apply

REPAIR PROCEDURE

UPDATE THE HVAC CONTROL MODULE SOFTWARE

CAUTION: Ensure all ignition 'ON'/ignition 'OFF' requests are carried out; failure to perform these steps may cause damage to control modules in the vehicle.

CAUTION: A Land Rover-approved Midtronics Vehicle Power Supply must be connected to the vehicle battery during IDS diagnosis/module programming.

Connect the Land Rover-approved Midtronics Vehicle Power Supply to the vehicle battery.
Turn ignition 'ON' (engine not running).
NOTE: IDS must be loaded with IDS-DVD128.02 v90 or later.
Connect the IDS to the vehicle and begin a new Symptom Driven Diagnostics (SDD) session.
Follow the on-screen prompts, allowing SDD to read the VIN and identify the vehicle.
From the Session Type selection screen, choose 'Diagnosis'.
Select the 'Selected Symptoms' tab, and then select:
- Electrical > Climate control system > Blower operation > Blower speed inoperative
Select 'continue'.
Select the 'Recommendations' tab.
From the Recommendations tab, select 'Run' to 'Configure existing module - Heating ventilation and air conditioning control module'
- Follow all on-screen instructions to complete this task.
Exit the current session.
Disconnect the IDS and the Midtronics Vehicle Power Supply from the vehicle.