Jeep Liberty KJ. Manual - part 331

•

When Monitored:
With the ignition on.

•

Set Condition:
The Hands Free Module detects voltage between 2.8 volts and 3.3 volts on the (X730) Voice Recognition/
Phone Switch Signal circuit for more than 30 seconds.

Possible Causes

AUTOMATIC DAY/NIGHT MIRROR

HANDS FREE MODULE

Diagnostic Test

CHECK FOR ACTIVE DTCS

Turn the ignition on.

With the scan tool, erase the HFM DTCs.

Attempt to make a phone call using the system.

With the scan tool, read the HFM DTCs.

Did this DTC reset?

Yes

>> Go To 2

>> 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.

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

Turn the ignition off.

Disconnect the Automatic Day/Night Mirror C2 harness connector.

Turn the ignition on.

With the scan tool, 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 cir-
cuit 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 Automatic Day/Night Mirror in accordance with

the service information.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-

ELECTRICAL/ELECTRONIC

CONTROL MODULES

STANDARD PROCEDURE).

>> 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 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).

8T - 46

NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

PRNDL 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 a gear selector message from the TCM.

Possible Causes

LOST COMMUNICATION WITH TCM

HANDS FREE MODULE

Diagnostic Test

ATTEMPT TO COMMUNICATE WITH THE TCM

Turn the ignition on.

Turn the radio on.

With the scan tool, attempt to communicate with the TCM.

Was the scan tool able to communicate with the TCM?

Yes

>> Go To 2

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

perform the related symptom.

ERASE DTC AND ATTEMPT TO RESET

With the scan tool, erase the HFM DTC’s.

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

With the scan tool, 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 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).

>> 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.

NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

8T - 47

RADIO 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 a message from the radio.

Possible Causes

LOST COMMUNICATION WITH RADIO

HANDS FREE MODULE

Diagnostic Test

ATTEMPT TO COMMUNICATE WITH THE RADIO

Turn the ignition on.

Turn the radio on.

With the scan tool, attempt to communicate with the radio.

Was the scan tool able to communicate with the radio?

Yes

>> Go To 2

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

perform the related symptom.

ERASE DTC AND ATTEMPT TO RESET

With the scan tool, erase the HFM DTC’s.

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

With the scan tool, 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 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).

>> 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.

8T - 48

NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

RAM WRITE ERROR

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the ignition on.

•

Set Condition:
The Hands Free Module detects a fault during an internal diagnostic check.

Possible Causes

HANDS FREE MODULE

Diagnostic Test

ERASE DTC AND ATTEMPT TO RESET

Turn the ignition on.

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

Perform 5 ignition key cycles, leaving the ignition key on for a minimum of 90 seconds per cycle.

With the scan tool, 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 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).

>> 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.

NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

8T - 49

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