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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 >> Park, License, and/or Tail Lamps 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 less than 2.0 ohms of resistance between the signal terminal 2 and the ground terminal 8 with the switch in the Park position.
    • If not the specified value, replace the headlamp switch.
  3. Test for less than 2.0 ohms of resistance between the signal terminal 2 and the ground terminal 8 with the switch in the Headlamp position.
    • If not the specified value, replace the headlamp switch.

Relay Test

  1. Ignition OFF, disconnect the relay.
  2. Ignition OFF, disconnect the relay.
    • If the resistance is not within the specified range, replace the relay.
  3. Test for infinite resistance between the following terminals:
    • 30 and 85
    • 30 and 86
    • 30 and 87
    • 85 and 87
    • If not the specified value, replace the relay.
  4. Install a 10A fused jumper wire between relay terminal 85 and B+. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms of resistance between terminals 30 and 87.
    • If greater than the specified range, replace the relay.
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