Dodge Ram Truck 1500-2500-3500. Manual — part 627

RPM 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 detect a PCI Bus message indicating current engine RPM.

Possible Causes

LOST COMMUNICATION WITH PCM

HANDS FREE MODULE

Diagnostic Test

1.

ATTEMPT TO COMMUNICATE WITH THE PCM

Start and idle the engine.

With the DRB, select Engine and read the Engine RPM.

Was the DRB able to communicate with the PCM and read engine RPM?

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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NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

DR/DH

VIN 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 the VIN message from the PCM.

Possible Causes

LOST COMMUNICATION WITH PCM

PCM NOT ACTIVE ON THE PCI BUS

HANDS FREE MODULE

Diagnostic Test

1.

ATTEMPT TO COMMUNICATE WITH THE PCM

Turn the ignition on.

With the DRB, attempt to communicate with the PCM.

Was the DRB able to communicate with the PCM?

Yes

>> Go To 2

No

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

perform the related symptom.

2.

CHECK PCM ACTIVITY ON THE PCI BUS

With the DRB, select System Monitors then J1850 Module Scan.

Does the DRB indicated that the PCM is present or active on the PCI Bus?

Yes

>> Go To 3

No

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

perform the related symptom.

3.

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.

DR/DH

NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

8T - 73

VOICE RECOGNITION SWITCH STUCK

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NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

DR/DH

VOICE RECOGNITION SWITCH STUCK (CONTINUED)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the ignition on.

•

Set Condition:
The Hands Free Module detects voltage between 3.5 volts and 4.0 volts on the (X730) Voice Recognition/
Phone Switch Signal circuit for more than 30 seconds.

Possible Causes

INSIDE REARVIEW MIRROR

HANDS FREE MODULE

Diagnostic Test

1.

CHECK FOR ACTIVE DTCS

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 (X730) Voice Recognition/Phone Switch Signal
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.)

DR/DH

NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

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