Diagnostic Test

1) CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's.

Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.

Attempt to make a phone call with the system.

With the scan tool, read the active DTC's.

Does the scan tool display this DTC as active?

Yes
1. Go to 2).
No
1. If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2) (X712) MICROPHONE 1 IN (+) CIRCUIT OPEN

Fig 1: Checking Microphone 1 In (+) Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the Hands Free Module harness connector.

Disconnect the Inside Rear View Mirror C2 harness connector.

Measure the resistance of the (X712) Microphone 1 IN (+) circuit between the HFM connector and the inside rear view mirror connector.

Is the resistance below 5.0 ohms?

Yes
1. Go to 3).
No
1. Repair the (X712) Microphone 1 IN (+) circuit for an open.
2. Perform BODY VERIFICATION TEST .
3) (X722) MICROPHONE 2 IN (+) CIRCUIT OPEN

Fig 2: Checking Microphone 2 In (+) Circuit
Courtesy of CHRYSLER LLC

Measure the resistance of the (X722) Microphone 2 IN (+) circuit between the HFM connector and the inside rear view mirror connector.

Is the resistance below 5.0 ohms?

Yes
1. Go to 4).
No
1. Repair the (X722) Microphone 2 IN (+) circuit for an open.
2. Perform BODY VERIFICATION TEST .
4) (X792) MICROPHONE IN (-) CIRCUIT OPEN

Fig 3: Checking Microphone In Circuit
Courtesy of CHRYSLER LLC

Measure the resistance of the (X792) Microphone IN (-) circuit between the HFM connector and the inside rear view mirror connector.

Is the resistance below 5.0 ohms?

Yes
1. Go to 5).
No
1. Repair the (X792) Microphone IN (-) circuit for an open.
2. Perform BODY VERIFICATION TEST .
5) (X712) (X722) (X792) MICROPHONE CIRCUITS SHORTED TO GROUND

Fig 4: Checking Microphone Circuits
Courtesy of CHRYSLER LLC

Measure the resistance between ground and each (X712) (X722) (X792) Microphone circuit.

Is the resistance below 100.0 ohms?

Yes
1. Repair the Microphone circuit that measured below 100.0 ohms for short to ground.
2. Perform BODY VERIFICATION TEST .
No
1. Go to 6).
6) (X712) (X722) (X792) MICROPHONE CIRCUITS SHORTED TO VOLTAGE

Fig 5: Checking Microphone Circuits
Courtesy of CHRYSLER LLC

Turn the ignition on.

Measure the voltage of each (X712) (X722) (X792) Microphone circuit.

Is the voltage above 1.0 volt?

Yes
1. Repair the Microphone circuit that measured above 1.0 volt for short to voltage.
2. Perform BODY VERIFICATION TEST .
No
1. Go to 7).
7) (X712) (X722) (X792) MICROPHONE CIRCUITS SHORTED TOGETHER

Fig 6: Checking Microphone Circuits
Courtesy of CHRYSLER LLC

Turn the ignition off.

Measure the resistance between each (X712) (X722) (X792) Microphone circuit.

Is the resistance below 100.0 ohms?

Yes
1. Repair the Microphone circuit that measured below 100.0 ohms for a short together.
2. Perform BODY VERIFICATION TEST .
No
1. Go to 8).
8) INSIDE REAR VIEW MIRROR
Replace the Inside Rear View Mirror in accordance with the service information.

Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.

Attempt to make a phone call with the system.

With the scan tool, read the active DTC's.

Does the scan tool display this DTC as active?

Yes
1. 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.
2. Perform BODY VERIFICATION TEST .
No
1. Repair is complete.
2. Perform BODY VERIFICATION TEST .