Dodge Ram Truck 1500-2500-3500. Manual — part 612

GENERAL MICROPHONE FAULT (CONTINUED)

4.

(X792) MICROPHONE IN (-) CIRCUIT OPEN

Measure the resistance of the (X792) Microphone IN (-) circuit
between the HFM connector and the Inside Rearview Mirror connector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 5

No

>> Repair the (X792) Microphone IN (-) circuit for an open.

Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)

5.

(X712) (X722) (X792) MICROPHONE CIRCUITS SHORTED TO GROUND

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

Is the resistance below 100.0 ohms?

Yes

>> Repair the Microphone circuit that measured below 100.0

ohms for short to ground.

Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)

No

>> Go To 6

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GENERAL MICROPHONE FAULT (CONTINUED)

6.

(X712) (X722) (X792) MICROPHONE CIRCUITS SHORTED TO VOLTAGE

Turn the ignition on.

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

Is the voltage above 1.0 volt?

Yes

>> Repair the Microphone circuit that measured above 1.0

volt for short to voltage.

Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)

No

>> Go To 7

7.

(X712) (X722) (X792) MICROPHONE CIRCUITS SHORTED TOGETHER

Turn the ignition off.

Measure the resistance between each (X712) (X722) (X792) Micro-
phone circuit.

Is the resistance below 100.0 ohms?

Yes

>> Repair the Microphone circuit that measured below 100.0

ohms for a short together.

Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)

No

>> Go To 8

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NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

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GENERAL MICROPHONE FAULT (CONTINUED)

8.

INSIDE REARVIEW MIRROR

Replace the Inside Rearview 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 DRB, read the HFM DTC’s.

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. (Refer to BODY VERIFICATION TEST - VER 1.)

No

>> Repair is complete.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

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IGNITION POWER MESSAGE NOT RECEIVED

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the ignition on.

•

Set Condition:
The Hands Free Module does not receive an ignition power status message from the Instrument Cluster (MIC).

Possible Causes

LOST COMMUNICATION WITH INSTRUMENT CLUSTER (MIC)

HANDS FREE MODULE

Diagnostic Test

1.

ATTEMPT TO COMMUNICATE WITH THE INSTRUMENT CLUSTER (MIC)

Turn the ignition on.

With the DRB, attempt to communicate with the MIC.

Was the DRB able to communicate with the MIC?

Yes

>> Go To 2

No

>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) and

perform the related symptom.

2.

ERASE DTC AND ATTEMPT TO RESET

With the DRB, erase the HFM DTC’s.

Cycle the ignition switch from off to on and wait approximately 1 minute.

With the DRB, read the HFM DTC’s.

Did this DTC reset?

Yes

>> Replace and program the Hands Free Module in accordance with the service information.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

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 con-
nectors for broken, bent, pushed out, and corroded terminals.

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