Suzuki XL7 2007 Service Manual page 1857

Circuit/System Testing
1. Ignition OFF, disconnect the auxiliary blower motor
Connecter C1 terminal 1.
2. Test for less than 1.0 ohm of resistance between the
low reference circuit terminal 1 and ground.
➢ If greater than 1.0 ohm, test the ground circuit for
an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates
between the B+ circuit terminal 2 and ground.
➢ If the test lamp does not illuminate, test the B+
circuit for a short to ground or an open/high
resistance. If the circuit tests normal and the B+
circuit fuse is open, replace the aux blower motor.
4. Ignition OFF, disconnect the harness connector at
the auxiliary blower motor control module.
5. Ignition ON, verify that a test lamp does not
illuminates between the control circuit terminal C2
pin3 and ground.
➢ If test lamp illuminates, test the control circuit for a
short to voltage.
6. Test for less than 1.0 ohm of resistance between the
ground circuit terminal C2 pin5 and ground.
➢ If greater than 1.0 ohm, test the ground circuit for
an open/high resistance.
7. Connect the auxiliary blower motor connector.
8. Ignition ON, verity that a test lamp illuminates
between the control circuit terminal C2 pin3 and
ground.
➢ If test lamp does not illuminate, test the control
circuit for a short to ground or an open/high
resistance. If circuit test normal replace auxiliary
blower motor.
9. Select the AUTO position on the front HVAC module.
10. Test for 12-27 Mv between the control circuit terminal
C2 pin3 and ground while adjusting the rear auxiliary
HVAC control module blower from min to max.
➢ If less than 12 Mv, test the control circuit for a short
to ground or an open/high resistance. If the circuit
tests normal replace the rear auxiliary HVAC
module.
➢ If greater than 27 Mv, test the control circuit for a
short to voltage. If the circuit tests normal replace
the rear auxiliary HVAC module.
Heating, Ventilation and Air Conditioning:
11. Test for above 10 volts while adjusting the rear
auxiliary HVAC blower switch to max setting.
➢ If less than 10 volts replace the rear auxiliary HVAC
control module.
12. Select the AUTO position on the rear auxiliary HVAC
control module if equipped or press the AUX button
on the front HVAC control to have the rear blower
controls mimic the front control.
13. Test for 12-145 Mv between the control circuit
terminal C2 pin3 and ground while adjusting the front
HVAC control module blower from low speed to high
speed.
➢ If less than 12 Mv, replace the front HVAC control
module.
➢ If greater than 145 Mv, replace the front HVAC
control module.
14. Place the front and rear HVAC modules in low
speed.
15. Test for 0.2--15 Mv between the signal circuit
terminal C2 pin3 and ground.
➢ If less than 0.2 Mv, test the signal circuit for a short
to ground or an open high resistance. If the circuit
tests normal replace the rear auxiliary HVAC
module.
➢ If greater than 15 Mv, test the signal circuit for a
short to voltage. If the circuit tests normal replace
the rear auxiliary HVAC module.
16. If all circuits test normal, replace the auxiliary blower
motor control module.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Auxiliary Blower Motor Replacement"
• "Auxiliary Blower Control Module Replacement"
• "Control Module References: " for HVAC Control
Module or Auxiliary HVAC replacement, setup and
programming.
7A-43