Dodge Ram Truck 1500-2500-3500. Manual — part 272
LOOPBACK FAILURE - INTERNAL ERROR
For the Audio Amplifier system circuit diagram (Refer to 8 - ELECTRICAL/AUDIO - SCHEMATICS AND DIA-
GRAMS).
For a complete wiring diagram Refer to Section 8W.
Possible Causes
AMP FAILURE
1.
AMP FAILURE
Cycle the ignition switch from on to off to on.
With the DRBIII
T
, read Amplifier DTCs.
Is the DTC active at this time?
Yes
>> This is an internal AMP Failure. Replace the Amplifier in accordance with the service information.
Perform BODY VERIFICATION TEST — VER 1.
No
>> Test Complete.
Perform BODY VERIFICATION TEST — VER 1.
8A - 90
AUDIO - SRT10 - AMP - ELECTRICAL DIAGNOSTICS
DR/DH
PCI BUS LOW/BUSY
For the Audio Amplifier system circuit diagram (Refer to 8 - ELECTRICAL/AUDIO - SCHEMATICS AND DIA-
GRAMS).
For a complete wiring diagram Refer to Section 8W.
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
1.
PCI BUS UNABLE TO COMMUNICATE WITH DRBIII
T
NOTE: Note: Determine which modules this
vehicle is equipped with before beginning.
NOTE: NOTE: When attempting to communicate
with any of the modules on this vehicle, the
DRBIII
T
will display 1 of 2 different communica-
tion errors: a NO RESPONSE message or a BUS
+/- SIGNALS OPEN message.
Turn the ignition on.
Using the DRBIII
T
, attempt to communicate with the
following control modules:
Airbag Control Module
Front Control Module
Instrument Cluster
Was the DRBIII
T
able to communicate with
one or more Module(s)?
Yes
>> Go To 2
No
>> Go To 3
DR/DH
AUDIO - SRT10 - AMP - ELECTRICAL DIAGNOSTICS
8A - 91
PCI BUS LOW/BUSY (CONTINUED)
2.
WIRING HARNESS INSPECTION
Turn the ignition off.
NOTE: Note: Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially
broken wires.
NOTE: Note: Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or
corroded terminals.
NOTE: NOTE: If the DRBIII
T
can not communicate with a single module, refer to the category list for the
related symptom.
Were any problems found?
Yes
>> Repair wiring harness/connectors as necessary.
Perform the BODY VERIFICATION TEST — VER 1.
No
>> Test Complete.
Perform the BODY VERIFICATION TEST — VER 1.
3.
OPEN PCI BUS CIRCUIT AT THE DATA LINK CONNECTOR (DLC)
Turn the ignition off.
Disconnect the PCM harness connector. Note:
Disconnect the DRBIII
T
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 harness con-
nector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 4
No
>> Repair the PCI Bus circuit for an open.
Perform the BODY VERIFICATION TEST — VER 1.
4.
MEASURE THE VOLTAGE OF THE PCI BUS CIRCUIT
NOTE: NOTE: Reconnect the PCM harness connector and the negative battery 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?
Yes
>> Go To 5
No
>> Go To 6
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AUDIO - SRT10 - AMP - ELECTRICAL DIAGNOSTICS
DR/DH
PCI BUS LOW/BUSY (CONTINUED)
5.
PCI BUS CIRCUIT SHORTED TO VOLTAGE
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: 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?
Yes
>> Repair the PCI Bus circuit for a short to voltage.
Perform the BODY VERIFICATION TEST — VER 1.
No
>> Test Complete.
Perform the BODY VERIFICATION TEST — VER 1.
6.
PCI BUS CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the negative battery cable.
Using a ohmmeter, connect one end to the PCI Bus circuit at the DLC, and the other end to ground.
While monitoring the ohmmeter, disconnect each module the vehicle is equipped with one at a time.
NOTE: NOTE: Total bus resistance to ground thru all of the modules is typically between 350 to 1000 ohms.
The more modules on the bus, the lower the total bus resistance will be.
Is the resistance below 150.0 ohms with all the modules disconnected?
Yes
>> Repair the PCI Bus circuit for a short to ground.
Perform the BODY VERIFICATION TEST — VER 1.
No
>> Test Complete.
Perform the BODY VERIFICATION TEST — VER 1.
DR/DH
AUDIO - SRT10 - AMP - ELECTRICAL DIAGNOSTICS
8A - 93
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