RAM 3500 Truck 2WD V8-5.7L VIN D (2003)
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a change in EBL mode switch status indicator operation when performing the HVAC Door Recalibration. Refer to The HVAC Door Recalibration
Function under System Diagnostics for more information.
System Diagnostics
Fault detection is through active and stored Diagnostic Trouble Codes (DTCs)
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DTCs are displayed by the DRBIII.
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Active DTCs are those which currently exist in the system. The condition causing the fault must be repaired in order to clear this type of DTC.
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Stored DTCs are those which occurred in the system since the A/C-Heater Control Module received the last ¨clear diagnostic info" message.
The A/C Cooldown Test:
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is actuated with the DRBIII.
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checks A/C system performance based on evaporator temperature sensor input.
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will not run if ambient temperature is below 12.7 °C (55 °F).
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will pass if the evaporator temperature drops 6.7 °C (20 °F) within two minutes of starting the test.
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faults display on the DRBIII as test messages only after running the test.
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faults will not display on the DRBIII as Diagnostic Trouble Codes.
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will cause the A/C mode switch status indicator to flash while the test is running.
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If the test fails, the status indicator will continue to flash until either the test returns passed or the ignition key is cycled. It will also prevent the
EBL mode switch status indicator from indicating EBL operating status. However, the EBL mode switch will continue to function in this state.
The HVAC Door Recalibration function:
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is actuated with the DRBIII.
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monitors for door span faults.
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faults display on the DRBIII as test messages only after running the test.
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faults will not display on the DRBIII as Diagnostic Trouble Codes.
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will cause the EBL mode switch status indicator to flash while the test is running.
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If the test fails, the status indicator will continue to flash until either the test returns passed or the ignition key is cycled. It will also prevent the
A/C mode switch status indicator from indicating A/C operating status. However, the A/C mode switch will continue to function in this state.
The Actuator Circuit Test:
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is actuated with the DRBIII.
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monitors for shorted actuator circuits.
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allows service to easily diagnose and troubleshoot up to three simultaneous shorts.
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supplements the continuous diagnostics on the actuator drive system.
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faults display on the DRBIII as test messages only after running the test.
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faults will not display on the DRBIII as Diagnostic Trouble Codes.
When Performing The Actuator Circuit Test
CAUTION:
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To ensure a proper diagnosis, repair all Short Too Complex messages first, all common door driver circuit related messages second, and all other
door driver circuit related messages last.
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The DRBIII can display up to three Actuator Circuit Test messages at a time After repairing each Actuator Circuit Test message, cycle the ignition
switch, then rerun the Actuator Circuit Test to ensure no new messages exist.
The Short Tho Complex message:
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indicates that a specific determination of which lines are shorted could not be made.
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is caused by more than three drivers being shorted in the same direction. For example, four drivers all shorted to ground, or two or more
drivers shorted with at least one driver shorted to ignition/battery and one driver shorted to ground.
-Messages displaying:
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XXX Driver/Circuit Shorted to Ignition Battery will set on a per-driver basis.
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XXX Driver/Circuit Shorted to Ground will set on a per-driver basis.
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the same two drivers/circuits shorted to ignition/battery as well as shorted to ground indicates that two actuator driver circuits are shorted
together.
-When the test returns passed, then troubleshooting should proceed to clearing faults and running the HVAC Door Recalibration system test as a final
check of system health.
Instrument Cluster
INSTRUMENT CLUSTER
The DR Instrument Cluster is a new type of control module that includes the hardware and software necessary to function as the cluster and the body
control module. The Instrument Cluster houses the Speedometer, Tachometer, Fuel gauge, Coolant Temperature gauge, Oil Pressure gauge, and the
Voltage gauge. The cluster positions all of the gauges using PCI bus messages received from the PCM. The cluster contains certain warning
indicators, depending on engine type and options. Some of the indicators are hardwire inputs and some indicators are controlled via PCI bus messages.
The warning chime tone generator is contained within the cluster. The cluster includes a vacuum fluorescent (VF) display for the PRNDL, Total and
