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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (Fixed & MOVEABLE Window Systems) >> Diagnostic Information and Procedures >> Power Windows Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate window motor.
  2. Ignition OFF, test for less than 2.0 ohms of resistance between the ground circuit terminal 4 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Test for 6.0-7.0 volts between the LIN circuit terminal 6 and ground.
    • If greater than the specified range, test the LIN circuit for a short to voltage. If the circuit tests normal, replace the applicable door module.
    • If less than the specified range, test the LIN circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the applicable door module.
  5. Ignition OFF, reconnect the harness connector at the window motor.
  6. Ignition ON, observe the appropriate scan tool Window Motor Fault Status parameter while raising and lower the window. The parameter should read No Fault.
    • If the parameter reads Motor Fault, Hall Fault, Memory Fault, LIN Fault, Anti-Trap Fault or Thermo Active, test or replace the appropriate power window motor.
  7. If all circuits test normal, replace the appropriate door module.

Rear Window Switch Circuit Malfunction 

  1. Ignition OFF, disconnect the harness connector at the applicable rear door window switch.
  2. Ignition ON, test for B+ between the reference voltage circuit terminal 3 and ground.
    • If less than the specified value, test the reference voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate door module.
  3. Ignition OFF, reconnect the harness connector at the rear door window switch. Disconnect the harness connector C2 at the appropriate door module.
  4. With the switch in the at-rest position, test for 8.0K - 9.0K ohms of resistance between the voltage reference circuit terminal 16 and the signal circuit terminal 14.
    • If not within the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, test or replace the appropriate rear door window switch.
  5. With the switch in the AUTO DOWN position, test for 2.75K - 3.75K ohms of resistance between the voltage reference circuit terminal 16 and the signal circuit terminal 14.
    • If not within the specified range, test or replace the appropriate rear door window switch.
  6. With the switch in the DOWN position, test for 5.25K - 6.25K ohms of resistance between the voltage reference circuit terminal 16 and the signal circuit terminal 14.
    • If not within the specified range, test or replace the appropriate rear door window switch.
  7. With the switch in the UP position, test for 1.9K - 2.9K ohms of resistance between the voltage reference circuit terminal 16 and the signal circuit terminal 14.
    • If not within the specified range, test or replace the appropriate rear door window switch.
  8. If all circuits test normal, replace the appropriate door module.
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