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 MANUALSCADILLAC2009ESCALADE ESV AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 552 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESONSTAR AUDIO MALFUNCTIONCIRCUIT/SYSTEM TESTING
2009 Cadillac Escalade ESV AWD
Circuit/System Testing
2009 Cadillac Escalade ESV AWDSECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X1 harness connector at the radio.
- Disconnect the X2 harness connector at the vehicle communication interface control module.
- Ignition ON, test for less than 1 V between the vehicle communication interface control module cellular telephone voice signal circuit terminal 1 X2 and ground.
- If not the specified value, test the cellular telephone voice signal circuit for a short to voltage.
- Test for less than 1 V between the vehicle communication interface control module cellular telephone voice low reference circuit terminal 2 X2 and ground.
- If not the specified value, test the cellular telephone voice low reference circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the vehicle communication interface control module cellular telephone voice signal circuit terminal 1 X2 and ground.
- If not the specified value, test the cellular telephone voice signal circuit for a short to ground.
- Test for infinite resistance between the vehicle communication interface control module cellular telephone voice low reference circuit terminal 2 X2 and ground.
- If not the specified value, test the cellular telephone voice low reference circuit for a short to ground.
- Test for less than 2 Ξ© between the vehicle communication interface control module cellular telephone voice signal circuit terminal 1 X2 and the radio terminal 7 X2.
- If not the specified value, test the cellular telephone voice signal circuit for a open/high resistance.
- Test for less than 2 Ξ© between the vehicle communication interface control module cellular telephone voice low reference circuit terminal 2 X2 and the radio terminal 15 X2.
- If not the specified value, test the cellular telephone voice low reference circuit for a open/high resistance.
- If all circuits test normal, replace the vehicle communication interface control module.
- If all circuits test normal, replace the radio.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.