SSM74619

Special Service Message
NOTE: A Special Service Message is a formal communication issued by Land Rover and carries
the same importance of a Technical Service Bulletin. An SSM is a quick method of
communicating "Need To Know" information to the technical service community. SSM's may
be issued in advance of a technical bulletin or may be the only communication on a given
topic. All information contained in Land Rover technical communications are intended for
use by trained, professional technicians with the knowledge, tools, and equipment required
to complete the procedure correctly and safely. It informs the Technicians of conditions that
may occur on some vehicles, or provides information that could assist in correct vehicle and
diagnostic service.
SSM 74619 - Heated Seat Temperature Performance
Models : Range Rover / L405
Range Rover Sport /
L494
Engineer Richard Attwood
Name :
Last 29 NOV 2019 12:05:50
Modified :
Category : Body
Symptom : 101000 Seating
Content : Issue: A customer may report that one or more of the
heated seats does not achieve a sufficient level of heat
in cooler ambient temperatures.
Cause: Heating Ventilation Air Conditioning (HVAC)
control of the Pulse Width Modulation (PWM) signal to
the heated seat pads.
Action: Land Rover are currently carrying out analysis
of the concern and will publish a communication on
TOPIx in December 2019 detailing the necessary
service procedure that is likely to require a software
update to the HVAC module.
In the meantime please do not continue with
diagnosis of the concern or fitment of
replacement components unless there is a
Diagnostic Trouble Code (DTC) present in the
HVAC module related to the heated seat
functionality.
If there is a DTC present then follow the
diagnostic guidance using Pathfinder and with
reference to the TOPIx Workshop Manual.
Note - Affected models are as follows:
L494 Range Rover Sport LW852819 onwards
L405 Range Rover LG550751 onwards
Jaguar Land Rover Limited 2000 - 2019 (Rel. 2675)