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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.
  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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