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Circuit/System Testing

IMPORTANT: It is recommended that Component Testing is performed before Circuit Testing when diagnosing steering wheel controls.
CAUTION: Refer to SIR Caution .
  1. Ignition OFF, disconnect the harness connector at the left and right steering wheel control switches.
  2. Ignition ON, Radio ON, test for 8.5-10.5 volts between the supply voltage circuit and ground at the right switch harness connector.
    • If less than 8.5 volts test the supply voltage circuit for a short to ground or an open/ high resistance. If circuit test normal, replace the radio.
    • If greater than 10.5 volts, test the supply voltage circuit for short to voltage. If circuit test normal, replace the radio.
  3. Test for 8.5-10.5 volts between the supply voltage circuit and toggle to the signal circuit at the left and right switch harness connectors.
    • If less than 8.5 volts test the signal circuit for an open/ high resistance. If circuit test is normal, replace the radio.
    • If greater than 10.5 volts, test the signal circuit for a short to voltage. If the circuit test is normal, replace the radio.
  4. Ignition OFF, reconnect the right switch.
  5. Ignition ON, Radio ON, test for 8.5-10.5 volts between the supply voltage circuit and signal circuit at the left switch harness connector.
    • If less than 8.5 volts test the voltage supply circuit to the left switch for a short to ground or an open/ high resistance. If circuit test normal, refer to component testing.
    • If greater than 10.5 volts, repair the voltage supply circuit for a short to B+.
  6. Test for 1-4 volts when pressing the right switch between the signal circuit and ground at the left switch harness connector.
    • If less than 1-volt, test the signal circuit for a short to ground. If the circuit test is normal, refer to component testing.
  7. If circuits test normal, refer to component testing.
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