how to fix GMC Sierra T1XX (2019-Present) infotainment system not working

GMC Sierra T1XX (2019-Present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

588 words

Problem Statement

Learn how to diagnose and fix the infotainment system issues in GMC Sierra T1XX (2019-Present). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shock or short circuits.
•Allow the vehicle to cool down before performing any work on the dashboard components.

Symptoms

•Infotainment screen is blank or black
•Touchscreen is unresponsive to inputs
•Bluetooth connection fails or cannot find devices
•Audio is not playing through the infotainment system
•Navigation feature is inactive or displaying errors
•Check infotainment system warning appears on the dashboard

Diagnostic Steps

1
Check for any software updates available for the infotainment system.
2
Inspect vehicle battery voltage to ensure it is within normal operating range (12.4-12.7 volts).
3
Scan for diagnostic trouble codes (DTCs) related to the infotainment system using an OBD-II scanner.
4
Perform a hard reset of the infotainment system by removing the fuse for the unit or disconnecting the battery.
5
Verify all wiring connections to the infotainment unit for looseness or damage.
6
Test the power supply to the infotainment unit using a multimeter.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Fuse puller
•Socket set
•Torque wrench

Parts Required

•Infotainment system fuse (if blown)
•Wiring harness (if damaged)

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Symptoms

•Infotainment screen is blank or black

•Touchscreen is unresponsive to inputs

•Bluetooth connection fails or cannot find devices

•Audio is not playing through the infotainment system

•Navigation feature is inactive or displaying errors

•Check infotainment system warning appears on the dashboard

Diagnostic Steps

1
Check for any software updates available for the infotainment system.
2
Inspect vehicle battery voltage to ensure it is within normal operating range (12.4-12.7 volts).
3
Scan for diagnostic trouble codes (DTCs) related to the infotainment system using an OBD-II scanner.
4
Perform a hard reset of the infotainment system by removing the fuse for the unit or disconnecting the battery.
5
Verify all wiring connections to the infotainment unit for looseness or damage.
6
Test the power supply to the infotainment unit using a multimeter.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, fuse puller, socket set, torque wrench.
Ensure the vehicle is parked on a level surface and the engine is turned off.
Disconnect the negative terminal of the battery to prevent electrical shock.

2. Software Update

Sub-steps:
1. Connect a compatible USB drive to a computer.
2. Visit the GMC website and download the latest software update for the infotainment system.
3. Plug the USB drive into the vehicle's USB port and follow on-screen prompts to install the update.

3. Hard Reset

Sub-steps:
1. Locate the fuse box, usually found under the driver’s side dashboard.
2. Use the fuse puller to remove the infotainment system fuse (refer to the owner’s manual for fuse location).
3. Wait for 5-10 minutes, then reinsert the fuse.
4. Reconnect the negative terminal of the battery.

4. Wiring Inspection

Sub-steps:
1. Remove the dashboard panel surrounding the infotainment unit using a trim removal tool.
2. Inspect the wiring harness for any loose connections, frayed wires, or corrosion.
3. Secure any loose connections and replace any damaged wiring as necessary.
4. Reassemble the dashboard panel.

5. Power Supply Test

Sub-steps:
1. Use a multimeter to check the power supply at the infotainment unit connector.
2. Confirm that the voltage is within the expected range (typically 12-14 volts).
3. If voltage is absent, trace the power wire back to the fuse box and inspect for breaks or shorts.