Suzuki XL7 2007 Service Manual page 1879

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 Testing
1. Ignition OFF, disconnect the appropriate temp
sensor harness connector at the inside air temp
sensor.
2. Ignition OFF, test for less than 1 ohm of resistance
between the ground circuit terminal C and the low
reference circuit terminal D of the inside air
temperature sensor.
➢ If greater than the specified range, test the low
reference circuit terminal D for an open/high
resistance. If the circuit tests normal, replace the
HVAC control module.
3. Ignition ON, verify the inside air temperature sensor
parameter is greater than 215°C (419°F).
➢ If less than the specified range, test the signal
circuit terminal A for a short to ground. If the circuit
tests normal, replace the HVAC control module.
4. Install a 3A fused jumper wire between the signal
circuit terminal A and the low reference circuit
terminal D of the sensor. Verify the inside air
temperature sensor parameter is less than -36°C (-
38°F).
➢ If greater than the specified range, test the signal
circuit terminal A for a short to voltage or an open/
high resistance. If the circuit tests normal, replace
the HVAC control module.
5. If all circuits test normal, test or replace the inside air
temperature sensor.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Scan Tool Data Definitions - HVAC - Automatic"
• "Inside Air Temperature Sensor Assembly
Replacement"
• "Control Module References: " for HVAC control
module replacement, setup and programming
Heating, Ventilation and Air Conditioning:
Sun Load Sensor Malfunction
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle
Diagnostic Information: " prior to using this diagnostic
procedure.
• Review "Strategy Based Diagnosis: " for an overview
of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle
Diagnostic Information: " provides an overview of
each diagnostic category.
Circuit/System Description
The sunload sensor is a 2-wire photo diode. The vehicle
uses left and right sunload sensors. The two sensors are
integrated into the sunload sensor assembly along with
the ambient light sensor. Ground and signal circuits
enable the sensor to operate. As the sunload increases,
the sensor signal decreases. The sensor operates within
an intensity range between completely dark and very
bright. The sensor signal varies between 0 and 5 volts.
The HVAC control module converts the signal to a range
between 0 and 255 counts. The sunload sensor provides
the HVAC control module with a measurement of the
amount of light shining on the vehicle. Bright or high
intensity light causes the vehicles interior temperature to
increase. The HVAC system compensates for the
increased temperature by diverting additional cool air
into the vehicle.
Diagnostic Aids
If DTCs B0158, and B3933 are all set inspect the signal
circuit for a short to voltage. If the circuit tests normal
replace the HVAC control module.
Reference Information
Schematic Reference
"HVAC Schematics"
Connector End View Reference
"HVAC Connector End Views"
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"
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