Dodge Ram Truck 1500-2500-3500. Manual — part 611

GENERAL MICROPHONE FAULT

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NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

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GENERAL MICROPHONE FAULT (CONTINUED)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the ignition on.

•

Set Condition:
The Hands Free Module detects a fault in any of the microphone circuits.

Possible Causes

(X712) MICROPHONE 1 IN (+) CIRCUIT OPEN

(X722) MICROPHONE 2 IN (+) CIRCUIT OPEN

(X792) MICROPHONE IN (-) CIRCUIT OPEN

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

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

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

INSIDE REARVIEW MIRROR

HANDS FREE MODULE

Diagnostic Test

1.

CHECK FOR ACTIVE DTC

Turn the ignition on.

With the DRB, read and record the HFM DTC’s and then erase the DTC’s.

Attempt to make a phone call with the system.

With the DRB, read the HFM DTC’s.

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

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NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

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GENERAL MICROPHONE FAULT (CONTINUED)

2.

(X712) MICROPHONE 1 IN (+) 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 (X712) Microphone 1 IN (+) circuit
between the HFM connector and the Inside Rearview Mirror connector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 3

No

>> Repair the (X712) Microphone 1 IN (+) circuit for an open.

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

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NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

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GENERAL MICROPHONE FAULT (CONTINUED)

3.

(X722) MICROPHONE 2 IN (+) CIRCUIT OPEN

Measure the resistance of the (X722) Microphone 2 IN (+) circuit
between the HFM connector and the Inside Rearview Mirror connector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 4

No

>> Repair the (X722) Microphone 2 IN (+) circuit for an open.

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

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NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

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