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Circuit/System Testing

CAUTION: Refer to SIR Caution .
IMPORTANT: It is recommended that Component Testing is performed before Circuit Testing when diagnosing steering wheel controls.
  1. Ignition OFF, disconnect the harness connector at the audio steering wheel control switch.
  2. Ignition ON, Radio ON, test for 8.5-12 volts between the 10-volt reference circuit and ground at the harness connector.
    • If less than 8.5 volts, test 10-volt reference circuit for short to ground or open/high resistance. If the circuit test is normal, replace the radio.
  3. Test for 0-0.5 volts between the signal circuit and ground at the harness connector.
    • If greater than 0.5 volt, test the signal circuit for a short to voltage. If the circuit test is normal, replace the radio.
  4. Test for 8.5-12 volts between the supply voltage circuit and the signal circuit at the harness connector.
    • If less than 8.5 volts, test the signal circuit for an open/high resistance. If the circuit test is normal, replace the radio.
  5. Ignition OFF, disconnect the harness connector at the radio.
  6. Test for infinite resistance between the signal circuit and ground at the harness connector.
    • If less than infinite ohms of resistance, test the signal circuit for a short to ground. If the circuit test is normal, refer to component testing.
  7. If all circuit test normal, refer to component testing.
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