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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 741 (Secondary And Configurable Customer Controls) >> Diagnostic Information and Procedures >> Steering Wheel Controls Inoperative >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
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 right steering wheel control switch.
  2. Ignition ON, Radio ON, test for 8.5-10.5 volts between the 10-volt reference circuit terminal 2 and ground.
    • If less than the specified range, test 10-volt reference circuit for short to ground or open/high resistance. If the circuit tests normal, replace the radio.
    • If greater than the specified range, test the 10-volt reference circuit for a short to voltage. If the circuit tests normal, replace the radio.
  3. Test for 8.5-10.5 volts between the 10-volt reference circuit terminal 2 and the signal circuit terminal 4.
    • If less than the specified range, test signal circuit for an open/high resistance. If the circuit tests normal, replace the radio.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  4. Ignition OFF, disconnect the C1 harness connector at the radio.
  5. Test for infinite resistance between the signal circuit terminal 11 and ground.
    • If not the specified value, test the signal circuit for a short to ground.
  6. If all circuits test normal, test or replace the steering wheel control switch.
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