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Home >> Suzuki >> 2007 >> XL7 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Lighting Systems >> Diagnostic Information and Procedures >> Interior Backlighting Inoperative >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the dimmer switch.
  2. Test for less than 1 Ω of resistance between the low reference circuit and ground.
    • If greater than 1 Ω, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. Ignition ON, verify the scan tool I/P dimmer input is greater than 4.5 volts.
    • If less than 4.5, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3-amp fused jumper wire between the signal circuit and the low reference circuit. Verify the scan tool dimmer switch is less than 5.
    • If greater than 5, test the signal circuit for a short to voltage or an open/high resistance.
  5. Reconnect the dimmer switch.
  6. Ignition ON, turn the headlamp switch to the HEAD position.
  7. Rotate the I/P dimmer switch to the high and then low illuminations settings. The I/P back lighting should brighten and dim with each rotation.
    • If the back lighting does not change intensity, test the instrument panel lamp supply voltage circuit for a short to voltage.
  8. If the circuit tests normal, replace the BCM.
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