Aston Martin V8 Vantage Workshop Manual page 287

Troubleshooting
The areas for inspection (steps) are given according to various circuit malfunctions. Use the following chart to verify the
symptoms of the trouble in order to diagnose the appropriate area.
Symptom(1)
Insufficient air (or no air) blown
from vents.
Symptom (2)
Amount of air blown from vents
does not change.
Shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the
cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses
Symptom (4)
Air intake mode does not change. Air intake mode does not change
Shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the
cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses
Symptom (5)
No temperature control with A/C
Module.
Shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the
cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses
Symptom (6)
Windshield fogged.
Shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the
cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses
October 2005
Description
Problem with each vent / duct or
both.
Airflow mode does not change.
Description
Fault in blower system.
are connected correctly and undamaged.
Description
when switching REC FRESH
mode.
are connected correctly and undamaged.
Description
Temperature does not change
with operating temperature
control dial
are connected correctly and undamaged.
Description
• A/C compressor does not
operate while airflow mode is
in DEFROSTER or HEAT DEF
modes
• Air intake mode does not
change to FRESH while
airflow mode is in
DEFROSTER or HEAT DEF
modes
are connected correctly and undamaged.
Workshop Manual
Air Conditioning (A/C) System (12.03)
Possible Cause
• Fault in Airflow Mode Actuator
• Fault in 'Vent' mode system
• Fault in 'Heat' mode system
• Fault in 'Defroster' mode system
Possible Cause
• Blower motor fault
• Blower unit fault
• Power transistor system fault
• Climate control unit fault
Possible Cause
• Air Intake Actuator fault
• Air intake door fault
Possible Cause
• Air Mix Actuator (5 V signal) system fault
• A/C Module (potentiometer GND signal) system
fault
• Air Mix Actuator (potentiometer input signal)
system fault
• Air Mix Actuator (potentiometer GND signal,
motor drive signal) system fault
• Air Mix Actuator system fault
• A/C unit air mix door fault
Possible Cause
• A/C Module (B+ signal) system fault
• Air intake actuator fault
• A/C Module (RECIRCULATE, FRESH signal)
system fault
• Fault in blower unit air intake doors
Climate Control (12.00)
12-3-15