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Home >> Cadillac >> 2008 >> XLR Base >> Repair and Diagnosis >> Accessories & Equipment >> Memory Modules >> Configurable Customer Control System >> Diagnostic Information and Procedures >> Steering Wheel Controls Inoperative (Preset/Vol) >> Circuit/System Testing
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Circuit/System Testing

IMPORTANT: It is recommended that Component Testing  be performed before Circuit Testing when diagnosing steering wheel controls.
CAUTION: Refer to SIR Caution .
  1. Ignition OFF, disconnect the X2 harness connector at the steering wheel control switch.
  2. Ignition ON, test for 9.5-10.5 volts between the ignition circuit terminal 3 and ground.
    • If less than the specified range, test the ignition circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the CD changer.
    • If greater than the specified range, test the ignition circuit for a short to voltage. If the circuit tests normal, replace the CD changer
  3. Test for 9.5-10.5 volts between the ignition circuit terminal and the signal circuit terminal 5.
    • If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the CD changer.
    • If greater than the specified range, test the signal circuit for a short to voltage. If circuit test normal, replace the CD changer.
  4. Install a 3A fused jumper wire between the ignition terminal 3 and the signal circuit terminal 4.
  5. Disconnect the X1 harness connector at the steering wheel controls.
  6. Test for 9.5-10.5 volts between the signal circuit terminal 1 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the switch.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the switch.
  7. Test for 9.5-10.5 volts between the signal circuit terminal 1 and the signal circuit terminal 2.
    • If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the CD Changer.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the CD Changer.
  8. Ignition OFF, disconnect the X1 harness connector at the CD Changer.
  9. Test for infinite resistance between the signal circuit terminal 11 and ground.
    • If less than the specified range, test the signal circuit for a short to ground.
  10. If all circuits test normal, test or replace the steering wheel control switch.
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