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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Lighting Systems) >> Diagnostic Information and Procedures >> Headlamps Malfunction >> Component Testing

Component Testing

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.

Headlamp Switch

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Test for infinite resistance between the signal terminal 3 and the ground terminal 8 with the switch in the Auto position.
    • If not the specified value, replace the headlamp switch.
  3. Test for infinite resistance between the signal terminal 1 and the ground terminal 8 with the switch in the Auto position.
    • If not the specified value, replace the headlamp switch.
  4. Test for less than 2.0 ohms of resistance between the signal terminal 3 and the ground terminal 8 with the switch in the Off position.
    • If not the specified value, replace the headlamp switch.
  5. Test for less than 2.0 ohms of resistance between the signal terminal 1 and the ground terminal 8 with the switch in the Headlamp position.
    • If not the specified value, replace the headlamp switch.

Turn Signal/Multifunction Switch

  1. Ignition OFF, disconnect the (C2) harness connector at the turn signal/multifunction switch.
  2. Test for infinite resistance between the signal terminal A and the ground terminal D with the flash to pass switch in the open position.
    • If not the specified value, replace the turn signal/multifunction switch.
  3. Test for infinite resistance between the signal terminal E and the ground terminal D with the headlamp dimmer switch in the low beam position.
    • If not the specified value, replace the turn signal/multifunction switch.
  4. Test for less than 2.0 ohms of resistance between the signal terminal A and the ground terminal D with the flash to pass switch in the closed position.
    • If not the specified value, replace the turn signal/multifunction switch.
  5. Test for less than 2.0 ohms of resistance between the signal terminal E and the ground terminal D with the headlamp dimmer switch in the high beam position.
    • If not the specified value, replace the turn signal/multifunction switch.
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