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Home >> Chevrolet >> 2008 >> Uplander Base, 3.9 W >> Repair and Diagnosis >> Accessories & Equipment >> Memory Modules >> Configurable Customer Control System >> Diagnostic Information and Procedures >> Steering Wheel Controls Inoperative >> Circuit/System Testing

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 harness connector at the right steering wheel control switch.
  2. Ignition ON, radio ON, test for 6.5-9.0 volts between the ignition circuit terminal 5 and ground.
    • If less than the specified value, test the circuit for a short to ground or open/high resistance. If circuit tests normal, replace the radio.
    • If greater than the specified value, test the circuit for short to voltage. If circuit tests normal, replace the radio.
  3. Test for 6.5-9.0 volts between the ignition circuit terminal 5 and the signal circuit terminal 1.
    • If less than the specified value, test the circuit for an open/high resistance. If the circuit tests normal, replace the radio.
    • If greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the radio.
  4. Install a 3A fused jumper wire between the ignition circuit terminal 5 and the ignition circuit terminal 2.
  5. Disconnect the harness connector at the left steering wheel control switch.
  6. Test for 6.5-9.0 volts between the ignition circuit terminal 4 and ground.
    • If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
    • If greater than the specified value, test the circuit for short to voltage. If the circuit tests normal, replace the radio.
  7. Test for 6.5-9.0 volts from the ignition circuit terminal 4 and the signal circuit terminal 1.
    • If less than the specified value, test the circuit for an open/high resistance. If the circuit tests normal, replace the radio.
    • If greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the radio.
  8. Ignition OFF, disconnect the X1 harness connector at the radio.
  9. Test for infinite resistance between the signal circuit terminal A7 and ground.
    • If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the radio.
  10. If all circuits test normal, test or replace the steering wheel control switch.
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