Chrysler PT Cruiser. Manual — part 52
Symptom:
*NO RESPONSE FROM WINDOW REGULATOR MODULE - PT27
POSSIBLE CAUSES
OPEN GROUND CIRCUIT
OPEN FUSED B+ CIRCUIT
OPEN FUSED IGNITION SWITCH OUTPUT CIRCUIT
OPEN PCI BUS CIRCUIT
WINDOW REGULATOR MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Turn all lights off.
Disconnect the Window Regulator Module harness connector.
Using a 12-volt test light connected to 12-volts, probe each ground circuit.
Is the test light illuminated for each ground 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 Window Regulator Module harness connector.
Using a 12-volt test light connected to ground, probe each Fused B+ circuit.
Did the test light illuminated for each Fused B+ circuit?
All
Yes
→ Go To 3
No
→ Check the fuses that feed the Fused B+ circuits for an open. If ok,
repair the Fused B+ circuit that did not illuminate the test light
for an open. Refer to the wiring diagrams in the service informa-
tion.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the Window Regulator Module 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.
Perform BODY VERIFICATION TEST - VER 1.
195
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 Window Regulator Module 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 Window Regulator 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 Window Regulator 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.
196
COMMUNICATION
*NO RESPONSE FROM WINDOW REGULATOR MODULE - PT27 —
Continued
Symptom:
*PCI BUS COMMUNICATION FAILURE
POSSIBLE CAUSES
WIRING HARNESS INTERMITTENT
OPEN PCI BUS CIRCUIT AT THE DATA LINK CONNECTOR (DLC)
PCI BUS CIRCUIT SHORTED TO VOLTAGE
MODULE SHORT TO VOLTAGE
PCI BUS CIRCUIT SHORTED TO GROUND
MODULE SHORT TO GROUND
TEST
ACTION
APPLICABILITY
1
Note: Determine which modules this vehicle is equipped with before begin-
ning.
Note: When attempting to communicate with any of the modules on this
vehicle, the DRB will display 1 of 2 different communication errors: a NO
RESPONSE message or a BUS +/- SIGNALS OPEN message.
Turn the ignition on.
Using the DRB, attempt to communicate with the following control modules:
Airbag Control Module
SKIM (SENTRY KEY IMMOBILIZER)
MIC (INSTRUMENT CLUSTER)
Was the DRBIII
t able to communicate with one or more Module(s)?
All
Yes
→ Go To 2
No
→ Go To 3
2
Turn the ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: If the DRB can not communicate with a single module, refer to the
category list for the related symptom.
Were any problems found?
All
Yes
→ Repair wiring harness/connectors as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
197
COMMUNICATION
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the PCM/ECM harness connector. Note: If equipped with NGC follow the
caution below.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Disconnect the DRB from the Data Link Connector (DLC).
Disconnect the negative battery cable.
Measure the resistance of the PCI Bus circuit between the Data Link Connector
(DLC) and the PCM/ECM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the PCI Bus circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
4
NOTE: Reconnect the PCM/ECM harness connector and the negative bat-
tery cable.
Turn the ignition on.
Measure the voltage of the PCI Bus circuit at the Data Link Connector (DLC).
Is the voltage above 7.0 volts?
All
Yes
→ Go To 5
No
→ Go To 6
5
Turn the ignition off.
Using a voltmeter, connect one end to the PCI Bus circuit at the DLC, and the other
end to ground.
Note: When performing the next step turn the ignition off (wait one minute)
before disconnecting any module. When the module is disconnected turn
the ignition on to check for a short to voltage.
Turn the ignition on.
While monitoring the voltmeter, disconnect each module the vehicle is equipped with
one at a time.
Is the voltage steadily above 7.0 volts with all the modules disconnected?
All
Yes
→ Repair the PCI Bus circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the module that when disconnected the short to voltage
was eliminated.
Perform BODY VERIFICATION TEST - VER 1.
198
COMMUNICATION
*PCI BUS COMMUNICATION FAILURE —
Continued
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