Speaker Malfunction Radio Output Testing (+Y91) (-U42)
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X2 and X3 harness connectors at the audio amplifier.
- Ignition ON, radio ON, test for B+ between the signal circuit terminal 8 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, replace the radio.
- Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground:
- Left front low level audio signal (+) - terminal 11 X3
- Left front low level audio signal (-) - terminal 12 X3
- Right front low level audio signal (+) - terminal 3 X3
- Right front low level audio signal (-) - terminal 4 X3
- Left rear low level audio signal (+) - terminal 15 X2
- Left rear low level audio signal (-) - terminal 14 X2
- Right rear low level audio signal (+) - terminal 16 X2
- Right rear low level audio signal (-) - terminal 8 X2
- 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, replace the radio.
- If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
- If all circuits test normal, replace the audio amplifier.