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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.

Turn Signal Multifunction Switch Circuit Testing 

  1. Ignition OFF, disconnect the harness connector at the turn signal multifunction switch.
  2. Ignition ON, install a test lamp between the turn signal voltage supply circuit and ground. The test lamp should flash ON and OFF.
    • If the test lamp does not flash, test the voltage supply circuit for a short to ground or an open/high resistance.
  3. Install a 3-amp fused jumper wire between the voltage supply circuit and the turn signal circuit. Verify that the proper turn signal lamps are ON.
    • If the turn signals are not ON, test the signal circuit of the turn signal multifunction switch for a short to voltage, short to ground or an open/high resistance.
  4. If all circuits test normal, test or replace the turn signal multifunction switch.

Park/Turn Signal/Turn Signal Indicator Circuit Testing 

  1. Ignition OFF, remove the inoperative light bulb.
  2. Test for less than 1.0 Ω of resistance between the ground circuit and ground.
    • If greater than 1.0 Ω, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit and the ground circuit.
  4. Ignition ON, turn ON the appropriate turn signal, the test lamp should flash.
    • If the test lamp remains ON all the time, test for a short to voltage on the control circuit. If the circuit tests normal, test or replace the BCM.
    • If the test lamp remains OFF all the time, test for a short to ground or an open/high resistance on the control circuit. If the circuit tests normal, test or replace the turn signal multifunction switch.
  5. If all circuits test normal, test or replace the light bulb.

Instrument Panel (I/P) Circuit Testing 

  1. Ignition OFF, disconnect the harness connector at the I/P.
  2. Test for less than 1.0 Ω of resistance between the ground circuit and ground.
    • If greater than 1.0 Ω, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit and the ground circuit.
  4. Ignition ON, turn ON the appropriate turn signal. The test lamp should flash.
    • If the test lamp remains ON all the time, test for a short to voltage on the control circuit. If the circuit tests normal, test or replace the BCM.
    • If the test lamp remains OFF all the time, test for a short to ground or an open/high resistance on the control circuit. If the circuit tests normal, test or replace the turn signal multifunction switch.
  5. If all circuits test normal, replace the I/P.
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