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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 left and right steering wheel control switches.
  2. Ignition ON, radio ON, test for 8.5-10.5 volts between the supply voltage circuit terminal 5 and ground at the right switch harness connector.
    • If less than 8.5 volts test the voltage supply 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 voltage supply circuit for short to voltage. If circuit test normal, replace the radio.
  3. Test for 8.5-10.5 volts from the supply voltage circuit terminal 5 and toggle to the signal circuits terminal 1 at the left and right switch harness connectors.
    • If less than 8.5 volts, test the signal circuit for an open/ high resistance. If the circuit test normal, replace the radio.
    • If greater than 10.5 volts, test the signal circuit for short to voltage. If the circuit test 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 terminal 4 and signal circuit terminal 1 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, test or replace the right switch.
    • If greater than 10.5 volts, repair the voltage supply circuit for a short to B+.
  6. Test for 1-3 volts between the signal circuit terminal 1 and ground at the left switch harness connector when pressing the mute button.
    • If less than 1 volt, test the signal circuit for a short to ground. If the circuit test is normal, test or replace the right switch.
  7. If circuit test normal, test or replace the left switch.
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