Dodge Ram Truck 1500-2500-3500. Manual — part 629
VOICE RECOGNITION/PHONE SWITCH CIRCUIT SHORT TO GROUND (CONTINUED)
3.
(X730) VOICE/RECOGNITION/PHONE SWITCH SIGNAL CIRCUIT SHORTED TO THE (X835) SENSOR
GROUND CIRCUIT
Turn the ignition off.
Disconnect the Hands Free Module harness connector.
Measure the resistance between the (X730) Voice Recognition/Phone
Switch Signal circuit and the (X835) Sensor Ground circuit.
Is the resistance below 100.0 ohms?
Yes
>> Repair the (X730) Voice Recognition/Phone Switch Signal
circuit for a short to the (X835) Sensor Ground circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
No
>> Go To 4
4.
(X730) VOICE/RECOGNITION/PHONE SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (X730) Voice Recog-
nition/Phone Switch Signal circuit.
Is the resistance below 100.0 ohms?
Yes
>> Repair the (X730) Voice Recognition/Phone Switch Signal
circuit for a short to ground.
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 Mod-
ule in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
8T - 80
NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS
DR/DH
VOICE RECOGNITION/PHONE SWITCH CIRCUIT SHORT TO VOLTAGE
DR/DH
NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS
8T - 81
VOICE RECOGNITION/PHONE SWITCH CIRCUIT SHORT TO VOLTAGE (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
The Hands Free Module detects voltage above 4.7 volts on the (X730) Voice Recognition/Phone Switch Signal
circuit.
Possible Causes
(X730) VOICE RECOGNITION/PHONE SWITCH SIGNAL CIRCUIT SHORT TO VOLTAGE
(X730) VOICE RECOGNITION/PHONE SWITCH SIGNAL CIRCUIT OPEN
(X835) SENSOR GROUND CIRCUIT OPEN
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.
Measure the voltage of the (X730) Voice Recognition/Phone Switch
Signal circuit.
Is the voltage above 5.3 volts?
Yes
>> Repair the (X730) Voice Recognition/Phone Switch Signal
circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
No
>> Go To 3
8T - 82
NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS
DR/DH
VOICE RECOGNITION/PHONE SWITCH CIRCUIT SHORT TO VOLTAGE (CONTINUED)
3.
INSIDE REARVIEW MIRROR
Turn the ignition off.
Connect a jumper wire between (X730) Voice Recognition/Phone
Switch Signal circuit and the (X835) Sensor Ground circuit.
Turn the ignition on.
With the DRB, monitor the VR Phone Switch Voltage.
Is the voltage approximately 0 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 4
4.
(X730) VOICE RECOGNITION/PHONE SWITCH SIGNAL CIRCUIT OPEN
Turn the ignition off.
Disconnect the Hands Free Module harness connector.
Measure the resistance of the (X730) Voice Recognition/Phone Switch
Signal 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 (X730) Voice Recognition/Phone Switch Signal
circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
DR/DH
NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS
8T - 83
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