Chrysler PT Cruiser. Manual — part 46

Symptom:

*NO RESPONSE FROM HANDS FREE MODULE

POSSIBLE CAUSES

ATTEMPT TO COMMUNICATE WITH THE RADIO

GROUND CIRCUIT OPEN

FUSED B(+) CIRCUIT OPEN

OPEN PCI BUS CIRCUIT

HANDS FREE MODULE

TEST

ACTION

APPLICABILITY

1

Turn the ignition on.
With the DRBIII

t, attempt to communicate with the radio.

Was the DRBIII

t able to I/D or communicate with the Radio?

All

Yes

→ Go To 2

No

→ Refer to the symptom list for problems related to no communica-

tion with the Radio
Perform BODY VERIFICATION TEST - VER 1.

2

Turn the ignition off.
Disconnect the Hands Free Module C1 harness connector.
Using a 12-volt test light connected to 12-volts, probe the ground circuit.
Is the test light illuminated?

All

Yes

→ Go To 3

No

→ Repair the ground circuit for an open.

Perform BODY VERIFICATION TEST - VER 1.

3

Turn the ignition off.
Disconnect the Hands Free Module C1 harness connector.
Using a 12-volt test light connected to ground, probe the Fused B(+) circuit.
Is the test light illuminated?

All

Yes

→ Go To 4

No

→ Repair the Fused B+ circuit for an open.

Perform BODY VERIFICATION TEST - VER 1.

171

COMMUNICATION

TEST

ACTION

APPLICABILITY

4

Note: Ensure there is PCI Bus communication with other modules on the
vehicle before proceeding. If not, refer to the symptom list from the menu
and repair as necessary.
Disconnect the Hands Free Module C1 harness connector.
Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and
black test probes.
Connect the scope input cable to the channel one connector on the DRB. Attach the
red and black leads and the cable to probe adapter to the scope input cable.
With the DRBIII

t select Pep Module Tools.

Select lab scope.
Select Live Data.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again
when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the Hands Free Module connector.
Turn the ignition on.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?

All

Yes

→ Replace the Hands Free Module in accordance with the Service

Information.
Perform BODY VERIFICATION TEST - VER 1.

No

→ Repair the PCI Bus circuit for an open.

Perform BODY VERIFICATION TEST - VER 1.

172

COMMUNICATION

*NO RESPONSE FROM HANDS FREE MODULE —

Continued

Symptom:

*NO RESPONSE FROM INSTRUMENT CLUSTER

POSSIBLE CAUSES

OPEN GROUND CIRCUIT

OPEN FUSED B+ CIRCUIT

OPEN FUSED IGNITION SWITCH OUTPUT CIRCUIT

OPEN PCI BUS CIRCUIT

INSTRUMENT CLUSTER

TEST

ACTION

APPLICABILITY

1

Turn the ignition off.
NOTE: Check fuses before continuing.
Turn all lights off.
Disconnect the Instrument Cluster C1 harness connector.
Using a 12-volt test light connected to 12-volts, probe each ground circuit.
Is the test light illuminated for each circuit?

All

Yes

→ Go To 2

No

→ Repair the ground circuit for an open.

Perform BODY VERIFICATION TEST - VER 1.

2

Turn the ignition off.
Disconnect the Instrument Cluster C1 harness connector.
Using a 12-volt test light connected to ground, probe the Fused B+ circuit.
Is the test light illuminated?

All

Yes

→ Go To 3

No

→ Repair the Fused B+ circuit for an open. Refer to the wiring

diagrams in the service information.
Perform BODY VERIFICATION TEST - VER 1.

3

Turn the ignition off.
Disconnect the Instrument Cluster C1 harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch
Output circuit.
Is the test light illuminated?

All

Yes

→ Go To 4

No

→ Repair the Fused Ignition Switch Output circuit for an open.

Refer to the wiring diagrams in the service information.
Perform BODY VERIFICATION TEST - VER 1.

173

COMMUNICATION

TEST

ACTION

APPLICABILITY

4

Note: Ensure there is PCI Bus communication with other modules on the
vehicle before proceeding. If not, refer to the symptom list from the menu
and repair as necessary.
Disconnect the Instrument Cluster C1 harness connector.
Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and
black test probes.
Connect the scope input cable to the channel one connector on the DRB. Attach the
red and black leads and the cable to probe adapter to the scope input cable.
With the DRBIII

t select Pep Module Tools.

Select lab scope.
Select Live Data.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again
when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the Instrument Cluster connector.
Turn the ignition on.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?

All

Yes

→ Replace the Instrument Cluster in accordance with the service

information.
Perform BODY VERIFICATION TEST - VER 1.

No

→ Repair the PCI Bus circuit for an open.

Perform BODY VERIFICATION TEST - VER 1.

174

COMMUNICATION

*NO RESPONSE FROM INSTRUMENT CLUSTER —

Continued