Astra L4-1.8L (2009)
Seat Heater: Symptom Related Diagnostic Procedures
Symptoms - Seat Heating and Cooling
Symptoms - Seat Heating and Cooling
Important: Review the system description in order to familiarize yourself with the system functions. Refer to Heated Seats Description and
Operation (See: Description and Operation).
Visual/Physical Inspection
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Inspect for aftermarket devices which could affect the operation of the heated seat system. Refer to Checking Aftermarket Accessories (See:
Testing and Inspection/Component Tests and General Diagnostics).
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Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections (
See: Testing and Inspection/Component Tests and General Diagnostics).
Symptom List
Refer to Front Heated Seat Malfunction (See: Front Heated Seat Malfunction) in order to diagnose the symptom.
Front Heated Seat Malfunction
Front Heated Seat Malfunction
Diagnostic Instructions
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Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
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Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
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Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure Instructions)
provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
Battery positive voltage is supplied at all times to the heated seat module through the battery positive voltage circuit and the heated seat fuse located in
the rear fuse block. When commanded ON, the heated seat module uses this voltage to heat the seat heating elements. The heated seat module and the
seat heating elements are grounded through the module ground circuit to G305.
When the heated seat switch is placed in either the high, medium, or low temperature position, a PWM signal is applied through the heated seat switch
