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.
Diagnostic Test
- CHECK FOR AN ACTIVE DTC NOTE:
Verify the connection of the inside rearview mirror harness connector.
- Ignition on, engine not running.
- With the scan tool, read the DTCs.
Does the scan tool display: B155D-11-MICROPHONE 1 CIRCUIT (-) - CIRCUIT SHORT TO GROUND as active?
Yes
- Go To 2.
No
- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
- CHECK THE INSIDE REARVIEW MIRROR
- Turn the ignition off.
- Disconnect the Inside Rearview Mirror harness connector.
- Ignition on, engine not running.
- Wait 20 seconds.
- With the scan tool, read the active DTCs.
Does the scan tool display: B155D-11-MICROPHONE 1 CIRCUIT (-) - CIRCUIT SHORT TO GROUND as active?
Yes
- Go To 3.
No
- Replace the Inside Rearview Mirror in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
- CHECK THE (X792) MICROPHONE 1 IN (-) CIRCUIT FOR A SHORT TO GROUND
- Turn the ignition off.
- Disconnect the Hands Free Module harness connector.
- Measure the resistance between ground and the (X792) Microphone 1 IN (-) circuit.
Is the resistance below 5 Ohms?
Yes
- Repair the short to ground in the (X792) Microphone 1 IN (-) circuit.
- Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
No
- Replace the Hands Free Module in accordance with the Service Information. Refer to MODULE, HANDS FREE, REMOVAL .
- Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
NO RELATED
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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.