Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTINFOTAINMENTCELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B1025, B1035, B1045, OR B1055CIRCUIT/SYSTEM TESTING
2008 Chevrolet HHR LT, 2.4 P, Automatic
Circuit/System Testing
2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Circuit/System Testing
Without Amplifier
- Ignition OFF, disconnect the harness connector at the appropriate speaker.
- Radio ON, test for 5.0-7.5 volts between the signal circuit terminal A and ground.
- If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
- 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.
- Test for 5.0-7.5 volts between the signal circuit terminal B and ground.
- If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
- 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 all circuits test normal, replace the speaker.
With Amplifier
- Ignition OFF, disconnect the X3 harness connector at the audio amplifier.
- 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 12
- Left front low level audio signal (-) terminal 10
- Right front low level audio signal (+) terminal 9
- Right front low level audio signal (-) terminal 11
- If greater than the specified range, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
- If less than the specified range, test the appropriate 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 rear low level audio signal (+) terminal 3
- Left rear low level audio signal (-) terminal 1
- Right rear low level audio signal (+) terminal 4
- Right rear low level audio signal (-) terminal 2
- If greater than the specified range, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
- If less than the specified range, test the appropriate signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
- If all circuits test normal, replace the audio amplifier.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.