Suzuki XL7 2007 Service Manual page 1845

Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at
the appropriate actuator.
2. Ignition OFF, test for less than 1 ohm of resistance
between the low reference circuit terminal 1 and
ground.
➢ If greater than 1 ohm, test the low reference circuit
terminal 1 for a short to voltage or an open/high
resistance. If the circuit tests normal, replace the
HVAC control module.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt
reference circuit terminal 3 and ground.
➢ If less than 4.8 volts, test the 5-volt reference circuit
terminal 3 for a short to ground or an open/high
resistance. If the circuit tests normal, replace the
HVAC control module.
➢ If greater than 5.2 volts, test the 5-volt reference
circuit terminal 3 for a short to voltage. If the circuit
tests normal, replace the HVAC control module.
4. Verify the appropriate scan tool parameter is less
than 5 counts.
➢ If greater than 5 counts, test the signal circuit
terminal 2 for a short to ground. If the circuit tests
normal, replace the HVAC Control Module.
5. Install a 3-amp fused jumper wire between the signal
circuit terminal 3 and the low reference circuit
terminal 1. Verify the appropriate scan tool
parameter is greater than 250 counts.
➢ If less than the specified range, test the signal
circuit for a short to voltage or an open/high
resistance. If the circuit tests normal, replace the
HVAC control module.
Heating, Ventilation and Air Conditioning:
6. Connect a test lamp between the control circuits
terminal 4 and 5 of the applicable actuator.
7. Command the actuator in both directions with a scan
tool. The test lamp should turn ON and OFF with
each command.
➢ If the test lamp remains always ON or always OFF
during either of the commands, test both control
circuits for a short to voltage, short to ground, or an
open/high resistance. If the circuit tests normal
replace the HVAC control module.
8. Ignition ON, after 30 seconds verify that a test lamp
illuminates between control circuit B terminal and
B+.
➢ If the test lamp does not illuminate, test the control
circuit for a short to voltage or an open/high
resistance. If the circuit tests normal replace the
HVAC control module.
9. Ignition OFF, verify that the test lamp does not
illuminate between control circuit B terminal and B+.
➢ If the test lamp illuminates, test the control circuit
for a short to ground. If circuit tests normal replace
the HVAC control module.
10. If all circuits test normal, test or replace the
appropriate actuator.
Repair Instructions
NOTE
Always perform the "Diagnostic Repair
Verification - Vehicle Diagnostic Information:
" after completing the diagnostic procedure.
• "Control Module References: " for HVAC replacement,
setup, and programming.
• "Recirculation Actuator Replacement"
• "Mode Actuator Replacement"
• "Air Temperature Actuator Replacement"
• "Auxiliary Air Temperature Actuator Replacement"
• "Auxiliary Mode Actuator Replacement"
7A-31