Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet HHR. 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.

Ignition OFF, disconnect the harness connector at the audio steering wheel control switch.
Ignition ON, Radio ON, test for 8.5-10.5 volts between the 10-volt reference circuit terminal 2 and ground at the harness connector.
- If less than specified, test the circuit for short to ground or open/high resistance. If the circuit test is normal, replace the radio.
- If greater than specified, test the circuit for short to voltage. If the circuit test is normal, replace the radio.
Test for less than 0.5 volts between the signal circuit terminal 4 (late production) or 1 (early production) and ground.
- If greater than specified, test the circuit for a short to voltage. If the circuit test is normal, replace the radio.
Test for 8.5-12 volts between the supply voltage circuit terminal 2 and the signal circuit terminal 4 (late production) or 1 (early production) at the harness connector.
- If less than 8.5 volts, test the signal circuit for an open/high resistance. If the circuit test is normal, replace the radio.
Ignition OFF, disconnect the X1 harness connector at the radio.
Test for infinite resistance between the signal circuit terminal 11 and ground.
- If less than infinite resistance, test the circuit for a short to ground. If the circuit test is normal, refer to Component Testing .
If all circuit test normal, refer to Component Testing .