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.
SYS.OK|MANUAL.DBβ LIVE
HOMESERVICE MANUALSGMC2019YUKON XL DENALI, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSCELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM - DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC INFORMATION AND PROCEDURESDTC B1025-B1135 (UQA WITH FRONT BENCH SEAT)CIRCUIT/SYSTEM TESTING
2019 GMC Yukon XL Denali, RWD
Circuit/System Testing
2019 GMC Yukon XL Denali, RWDSECTION Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate P19 Speaker. Ignition ON, infotainment system ON, mute OFF.
- Test for 5 - 7 V between each audio signal circuit terminal 1 and terminal 2 and ground.
- If less than 5 VΒ
- Ignition OFF, disconnect the X1 and X2 harness connectors at the T3 Audio Amplifier.
- Test for infinite resistance between the signal circuit and ground.
- If less than infinite resistance, repair the short to ground on the circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ξ© in the signal circuit end to end.
- If 2 Ξ© or greater, repair the open/high resistance in the circuit.
- If less than 2 Ξ©, replace the T3 Audio Amplifier.
- If greater than 7 VΒ
- Ignition OFF, disconnect the X1 and X2 harness connectors at the T3 Audio Amplifier. Ignition ON.
- Test for less than 1 V between the signal circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the T3 Audio Amplifier.
- Go to next step: If 5 - 7 VΒ
- Test or replace the P19 Speaker.
NOTE:
Some circuits supply audio signals to more than one speaker. It may be necessary to disconnect all speakers on the affected audio circuit when performing circuit tests.
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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.