Dodge Neon / Neon SRT-4. Manual - part 471

TEST

ACTION

APPLICABILITY

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 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.

→ Repair the PCI Bus circuit for an open.

Perform BODY VERIFICATION TEST - VER 1.

106

COMMUNICATION

*NO RESPONSE FROM INSTRUMENT CLUSTER —

Continued

Symptom:

*NO RESPONSE FROM LEFT SIACM

POSSIBLE CAUSES

INTERROGATE ACM

GROUND CIRCUIT OPEN

FUSED IGNITION SWITCH OUTPUT CIRCUIT (RUN/START) OPEN

PCI BUS CIRCUIT OPEN

LEFT SIDE IMPACT AIRBAG CONTROL MODULE

TEST

ACTION

APPLICABILITY

Turn the ignition on.
With the DRBIII

t select Passive Restraints.

With the DRBIII

t select Airbag and read the active DTC’s.

Is the Loss Of Ignition Run/Start DTC set?

All

Yes

→ Refer to the symptom list and perform the Loss Of Ignition

Run/Start symptom.
Perform AIRBAG VERIFICATION TEST - VER 1.

→ Go To 2

Ensure that the battery is fully charged.
Warning: TURN IGNITION OFF, DISCONNECT THE BATTERY AND WAIT
TWO MINUTES BEFORE PROCEEDING.
Disconnect the Left Side Impact Airbag Control Module harness connector.
Connect the appropriate Load Tool SIACM Adapter to the SIACM connector.
Using a 12-volt test light connected to 12-volts, probe the ground circuit.
NOTE: Make sure test light is connected to the Battery positive terminal.
Is the test light illuminated?

All

Yes

→ Go To 3

→ Repair the Ground circuit for an open.

Perform AIRBAG VERIFICATION TEST - VER 1.

Note: When reconnecting Airbag system components, the ignition must be
turned off and the battery must be disconnected.

Warning: TURN IGNITION OFF, DISCONNECT THE BATTERY AND WAIT
TWO MINUTES BEFORE PROCEEDING.
Disconnect the Left Side Impact Airbag Control Module harness connector.
Connect the appropriate Load Tool SIACM Adapter to the SIACM connector.
Turn the ignition on and then reconnect the Battery.
Measure the voltage of the Fused Ignition Switch Output (Run/Start) circuit.
Is the voltage above 6.0 volts?

All

Yes

→ Go To 4

→ Repair the Fused Ignition Switch Output (Run/Start) circuit for

an open.
Perform AIRBAG VERIFICATION TEST - VER 1.

Note: When reconnecting Airbag system components, the ignition must be
turned off and the battery must be disconnected.

107

COMMUNICATION

TEST

ACTION

APPLICABILITY

NOTE: Ensure there is PCI bus communication with other modules. If not,
refer to the PCI Bus Communication Failure symptom and repair as
necessary.
WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING.
Disconnect the Left Side Impact Airbag Control Module harness connector.
Connect the appropriate Load Tool SIACM Adapter to the SIACM connector.
Turn the ignition on and then reconnect the Battery.
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. Set Probe to x10.
Press F2 again when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the Left Side Impact Airbag Control Module connector.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?

All

Yes

→ Go To 5

→ Repair the PCI Bus circuit for an open.

Perform AIRBAG VERIFICATION TEST - VER 1.

If there are no possible causes remaining, view repair.

All

Yes

→ Replace the Left Side Impact Airbag Control Module (LSIACM) in

accordance with the Service Information. WARNING: Make sure
the battery is disconnected and wait 2 minutes before proceeding.
Perform AIRBAG VERIFICATION TEST - VER 1.

108

COMMUNICATION

*NO RESPONSE FROM LEFT SIACM —

Continued

Symptom:

*NO RESPONSE FROM PCM (PCI BUS) - NGC

POSSIBLE CAUSES

PCM PCI NO RESPONSE

POWERTRAIN CONTROL MODULE

PCI BUS CIRCUIT OPEN

TEST

ACTION

APPLICABILITY

Turn the ignition on.
NOTE: As soon as one or more module communicates with the DRB, answer
the question.
With the DRB, enter Anti-Lock Brakes.
With the DRB, enter Electro/Mechanical Cluster (MIC).
With the DRB, enter Passive Restraints then Airbag.
Were you able to establish communications with any of the modules?

All

Yes

→ Go To 2

→ Refer to symptom PCI Bus Communication Failure in the Com-

munications category.
Perform POWERTRAIN VERIFICATION TEST VER - 1.

With the DRB read the Powertrain DTC’s. This is to ensure power and grounds to the
PCM are operational.
NOTE: If the DRB will not read PCM DTC’s, follow the NO RESPONSE TO
PCM (PCM SCI only) symptom path.
Turn the ignition off.
Disconnect the PCM harness connectors.
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.
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 appropriate terminal of special tool #8815.
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 and program the Powertrain Control Module in accor-

dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.

→ Repair the PCI Bus circuit for an open.

Perform POWERTRAIN VERIFICATION TEST VER - 1.

109

COMMUNICATION

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