Suzuki XL7 2007 Service Manual page 1844

7A-30 Heating, Ventilation and Air Conditioning:
Circuit
Auxiliary Mode Door Control A Circuit
Auxiliary Mode Door Control B Circuit
Auxiliary Mode Door Position Signal
Auxiliary Mode 5-Volt Reference Circuit
Auxiliary Mode Low Reference Circuit
Circuit/System Description
The HVAC control module controls the HVAC door
actuators to regulate the airflow through the HVAC
system. Each actuator consists of an electric motor and
a potentiometer. The module supplies a low reference
and 5-volt reference source voltage to the potentiometer.
The HVAC control module monitors the voltage drop
across the potentiometer on the door position signal
circuit. When the actuator shaft rotates, the voltage on
the door position signal circuit changes. The HVAC
control module supplies the actuator motor with a12-volt
control circuit and a ground control circuit. The HVAC
module controls the direction of the actuator door by
changing the polarity of the control circuits.
Conditions for Running the DTC
• The ignition is ON.
• Ignition voltage is between 9-16 volts.
• The HVAC module is ON.
Conditions for Setting the DTC
The actual door position differs from the commanded
door position by more than 5 counts or the HVAC control
module detects the door position signal circuit is less
than 12 counts or greater than 247 counts.
Action Taken When the DTC Sets
Driver A and driver B circuits are deactivated for the
appropriate actuator.
Open/High
Short to Ground
Resistance
B3782 61B3779 B3782 61 B3779
61
B3782 61B3779 B3782 61 B3779
61
B3782 61B3779 B3782 61 B3779
61
B0433 61 B0423
61 B0228 61 B3782 61 B3779
B3782 61B3779
61
B3782 61 B3779
—
Conditions for Clearing the DTC
• The DTC becomes history when the HVAC control
module no longer detects the condition that set the
DTC.
• The history DTC will clear after 50 fault free ignition
cycles.
• The DTC can be cleared with a scan tool.
Reference Information
Schematic Reference
"HVAC Schematics"
Connector End View Reference
"HVAC Connector End Views"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
Scan Tool Reference
• "Scan Tool Data List - HVAC - Automatic"
• "Scan Tool Output Controls - HVAC - Automatic"
• "Scan Tool Data Definitions - HVAC - Automatic"
Circuit/System Verification
Ignition ON, operate the appropriate actuator using the
HVAC controls. The applicable scan tool parameter
should transition from 7 counts to 250 counts.
Short to
Voltage
—
61
—
61
B3782 61
61 B3779 61
B3782 61
61 B3779 61
—
61
Signal
Performance
—
—
—
—
—