Circuit/System Testing

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Note: It is Recommend that Component Testing is performed before Circuit Testing when diagnosing steering wheel controls.

CAUTION: Refer to SIR Caution .

With the ignition OFF, disconnect the harness connector at the left and right steering wheel control switches.
With the ignition ON, radio ON, test for 9.6-10.2 volts between the remote radio control supply voltage circuit and ground at the right switch harness connector.
- If less than 9.6 volts test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit test is normal, replace the radio.
- If greater than 10.2 volts, test the voltage supply circuit for short to voltage. If the circuit test is normal, replace the radio.
Connect a test lamp between the steering wheel controls signal circuit and ground at the right switch harness connector. Verify test lamp does not illuminate.
- If test lamp illuminates, test the signal circuit for a short to voltage. If the circuit test is normal, replace the radio.
Ignition OFF, test the jumper wire circuit for less than 1.0 ohm of resistance between the left and right switch harness connectors.
- If greater than 1.0 ohm, repair jumper wire for an open/high resistance.
Disconnect the harness connector at the radio.
Test for infinite resistance between the signal circuit and ground, at the radio harness connector.
- If less than infinite resistance, test the signal circuit for a short to ground. If the circuit test is normal, test or replace the switch.
Test the steering wheel controls signal circuit for less than 1.0 ohm of resistance between the radio and switches.
- If greater than 1.0 ohm, test the signal circuit for an open/high resistance. If the circuits test normal, refer to Component Testing .
If the circuit test is normal, test or replace switch.