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Home >> GMC >> 2007 >> Acadia SLT, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 223 (Secondary And Configurable Customer Controls) >> Diagnostic Information and Procedures >> Steering Wheel Controls Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac SRX. 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 left steering wheel control switch.
  2. Ignition ON, test for ignition voltage between the ignition circuit terminal 1 and ground.
    • If less than the specified value, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. Test for 0 volts between the signal circuit terminal 4 and ground.
    • If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  4. Test for ignition voltage between the ignition circuit terminal 1 and the signal circuit terminal 4.
    • If less than the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  5. Install a 3A fused jumper wire at the ignition circuit terminal 1 and the signal circuit terminal 5.
  6. Disconnect the harness connector at the right steering wheel control switch.
  7. Test for ignition voltage between the signal circuit terminal 1 and ground.
    • If less than the specified value, test the signal circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the BCM.
  8. Test for 0 volts between the circuit terminal 4 and ground.
    • If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  9. Test for ignition voltage between the ignition circuit terminal 1 and the signal circuit terminal 4.
    • If less than the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  10. If all circuits test normal, test or replace the switch.
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