Dodge Ram Truck 1500-2500-3500. Manual — part 628

VOICE RECOGNITION/PHONE SWITCH CIRCUIT RATIONALITY

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NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

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VOICE RECOGNITION/PHONE SWITCH CIRCUIT RATIONALITY (CONTINUED)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the ignition on.

•

Set Condition:
The Hands Free Module detects an invalid voltage signal on the (X730) Voice Recognition/Phone Switch Sig-
nal circuit.

Possible Causes

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.

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.

2.

CHECK THE VOLTAGE OF THE (X730) VOICE RECOGNITION/PHONE SWITCH SIGNAL

Turn the ignition off.

Disconnect the Inside Rearview Mirror C2 harness connector.

Turn the ignition on.

With the DRB, monitor the VR Phone Switch voltage.

While monitoring the VR Phone Switch voltage, momentarily connect a
jumper wire between the (X730) Voice Recognition/Phone Switch Sig-
nal circuit and ground.

NOTE: The sensor voltage should switch from above 4.7 volts
when the jumper is not connected to below 0.6 volts when the
jumper is connected.

Does the sensor voltage switch from above 4.7 volts to below
0.6 volt as described?

Yes

>> Replace the Inside Rearview Mirror in accordance with the

service information.

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

No

>> 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.)

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NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

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VOICE RECOGNITION/PHONE SWITCH CIRCUIT SHORT TO GROUND

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NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

DR/DH

VOICE RECOGNITION/PHONE SWITCH CIRCUIT SHORT TO GROUND (CONTINUED)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the ignition on.

•

Set Condition:
The Hands Free Module detects voltage below 0.6 volts on the (X730) Voice Recognition/Phone Switch Signal
circuit.

Possible Causes

(X730) VOICE RECOGNITION/PHONE SWITCH SIGNAL CIRCUIT SHORT TO (X835) SENSOR GROUND
CIRCUIT

(X730) VOICE RECOGNITION/PHONE SWITCH SIGNAL 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.

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.

2.

CHECK THE VOLTAGE OF THE (X730) VOICE RECOGNITION/PHONE SWITCH SIGNAL

Turn the ignition off.

Disconnect the Inside Rearview Mirror C2 harness connector.

Turn the ignition on.

With the DRB, monitor the VR Phone Switch voltage.

Is the voltage above 4.7 volts?

Yes

>> Replace the Inside Rearview Mirror in accordance with the

service information.

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

No

>> Go To 3

DR/DH

NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

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