Dodge Ram Truck 1500-2500-3500. Manual — part 372

IGNITION UNLOCK CIRCUIT RATIONALITY CHECK

For the Instrument Cluster circuit diagram (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - SCHEMATICS
AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Continuously.

•

Set Condition:
One second of Run/Start above 5 Volts, Unlock Status Low, and Run/ACC Status High.

Possible Causes

IGNITION UNLOCK-RUN-START FUSE OPEN

(F21) IGNITION UNLOCK-RUN-START CIRCUIT OPEN

INSTRUMENT CLUSTER

Diagnostic Test

1.

IGNITION UNLOCK-RUN-START FUSE OPEN

Turn the ignition off.

Inspect the Ignition Unlock-Run-Start fuse in the PDC.

Is the fuse open?

Yes

>> Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for a short to ground

condition.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

No

>> Go To 2

2.

INSTRUMENT CLUSTER

Turn the ignition off.

Disconnect the Instrument Cluster C3 harness connector.

Turn the ignition on.

Measure the voltage of the (F1) Ignition Unlock-Run-Start circuit.

Is the voltage above 10 volts?

Yes

>> Replace the Instrument Cluster in accordance with the ser-

vice information.

Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)

No

>> Repair the (F1) Ignition Unlock-Run-Start circuit for an

open.

Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)

8J - 48

INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS

DR/DH

INCORRECT ODOMETER VALUE FOUND

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
During power up.

•

Set Condition:
If the Instrument Cluster detects the odometer value memory is corrupted, this code will set. When this code
is set the VF Odometer displays [ - - ].

Possible Causes

INSTRUMENT CLUSTER

Diagnostic Test

1.

INSTRUMENT CLUSTER

CAUTION: Do not attempt to exchange or

(

swap

(

an Instrument Cluster from one vehicle to another. Module

memory/configuration damage may occur. Refer to the Instrument Cluster Caution in the Service Informa-
tion.

NOTE: When this code is set the VF Odometer will display dashes (- -).

NOTE: If the PCM has been replaced, program the new module with the correct VIN.
Ensure that the Instrument Cluster has not been damaged or previously installed in a different vehicle.

With the DRBIII

T

, erase DTCs.

Cycle the ignition.

With the DRBIII

T

, read DTCs.

Did this DTC reset?

Yes

>> Replace and configure the Instrument Cluster in accordance with the Service Information.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

No

>> Test Complete.

DR/DH

INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS

8J - 49

INTERNAL MODULE BOOTLOADER FAILURE

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
At power up for the module.

•

Set Condition:
If the checksum value does not equate to the calculated value.

Possible Causes

INSTRUMENT CLUSTER

1.

INSTRUMENT CLUSTER

When this code is set, the Instrument Cluster must be replaced.

Repair

Replace and configure the Instrument Cluster in accordance with the Service Information.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

8J - 50

INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS

DR/DH

INTERNAL MODULE FLASH MEMORY CHECKSUM FAILURE

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
At power up for the module.

•

Set Condition:
If the checksum value does not equate to the calculated value. Indicates that the Instrument Cluster internal
memory is corrupted.

Possible Causes

INSTRUMENT CLUSTER

1.

INSTRUMENT CLUSTER

When this code is set, the Instrument Cluster must be replaced.

Repair

Replace and configure the Instrument Cluster in accordance with the Service Information.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

DR/DH

INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS

8J - 51