Mirror Power Circuit Shorted to Ground

MIRROR POWER CIRCUIT SHORT TO GROUND





WHEN MONITORED
With the ignition on.

SET CONDITION
The Hands Free Module detects low voltage on the (X793) Microphone Feed circuit.

POSSIBLE CAUSES
- (X793) Microphone feed circuit open
- (X793) Microphone feed circuit short to ground
- Inside rearview mirror
- Hands free module

DIAGNOSTIC TEST

1. CHECK FOR ACTIVE DTC
Turn the ignition on.
With the DRB, erase the HFM DTCs.
Attempt to make a phone call using the system.
With the DRB, read the HFM DTCs.

Q: Did this DTC reset?

YES: Go To 2

NO: The condition that set this DTC is no longer present. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.

2. (X793) MICROPHONE FEED CIRCUIT OPEN




Turn the ignition off.
Disconnect the Hands Free Module harness connector.
Disconnect the Inside Rearview Mirror C2 harness connector.
Measure the resistance of the (X793) Microphone Feed circuit between the HFM connector and the Inside Rearview Mirror connector.

Q: Is the resistance below 5.0 ohms?

YES: Go To 3

NO: Repair the (X793) Microphone Feed circuit for an open. Perform BODY VERIFICATION TEST - VER 1.

3. (X793) MICROPHONE FEED CIRCUIT SHORT TO GROUND




Measure the resistance between ground and the (X793) Microphone Feed circuit

Q: Is the resistance below 100.0 ohms?

YES: Repair the (X793) Microphone Feed circuit for short to ground. Perform BODY VERIFICATION TEST - VER 1.

NO: Go To 4

4. INSIDE REARVIEW MIRROR
Replace the Inside Rearview Mirror in accordance with the service information.
Turn the ignition on.
With the DRB, erase the HFM DTCs.
Attempt to make a phone call using the system.
With the DRB, read the HFM DTCs.

Q: Did this DTC reset?

YES: Inspect the wiring and connectors for damage or shorted circuits. If Ok, replace and program the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1.

NO: Repair is complete. Perform BODY VERIFICATION TEST - VER 1.