Suzuki XL7 2007 Service Manual page 1877

Air Recirculation Malfunction
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
• "Strategy Based Diagnosis: "
• "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: "
Diagnostic Fault Information
Circuit
Recirculation Door Control Circuit A
Recirculation Door Control Circuit B
5-Volt Reference
Recirculation Door Position Signal
Recirculation Actuator Low Reference
B+ circuit of the HVAC control module
Ground circuit of the HVAC control module
Ignition 1 circuit of the HVAC control
module
*-Circuit Inoperative
Circuit/System Description
The recirculation actuator is a 5-wire bi-directional
electric motor that incorporate a feedback potentiometer.
Low reference, 5-volt reference, position signal, and 2
control circuits enable the actuators to operate. The
control circuits use either a 0 or 12-volt value to
coordinate the actuator movement. When the actuator is
at rest, both control circuits have a value of 0 volts. In
order to move the actuator, the HVAC control module
grounds one of the control circuits while providing the
other with 12 volts. The HVAC control module reverses
the polarity of the control circuits to move the actuator in
the opposite direction. When the actuator shaft rotates,
the potentiometer's adjustable contact changes the door
position signal between 0-5 volts.
Diagnostic Aids
Inspect the recirculation door and recirculation actuator
for the following:
• A misaligned recirculation actuator. Refer to
"Recirculation Actuator Replacement".
• Broken or binding linkages or recirculation door.
• An obstruction that prevents the recirculation actuator
from operating within the full range of motion.
• Missing seals to the recirculation door.
If the above procedure does not fix the problem test the
HVAC control module ignition 1 circuit for an open or
high resistance.
Heating, Ventilation and Air Conditioning:
Short to Open/High
Ground Resistance
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Reference Information
Schematic Reference
"HVAC Schematics"
Connector End View Reference
"HVAC Connector End Views"
Description and Operation
• "Air Delivery Description and Operation"
• "Air Temperature Description and Operation"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
Scan Tool Reference
• "Scan Tool Output Controls - HVAC - Automatic"
• "Scan Tool Data List - HVAC - Automatic"
• "Scan Tool Data Definitions - HVAC - Automatic"
Circuit/System Verification
1. Turn ON the ignition, with the engine OFF.
2. Place the blower motor switch at the maximum
speed position.
3. Place the mode switch in the vent or panel position.
4. Place the recirculation switch in the ON position for
recirculation.
5. Place the recirculation switch in the OFF position for
outside air position.
The flow of air should change through the vent or panel.
Short to Signal
Voltage Performance
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7A-63