Dodge Ram Truck 1500-2500-3500. Manual — part 376

*ALL GAUGES INOPERATIVE

8J - 64

INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS

DR/DH

*ALL GAUGES INOPERATIVE (CONTINUED)

For a complete wiring diagram Refer to Section 8W.

Possible Causes

NO RESPONSE - PCI BUS

NO RESPONSE - PCI BUS - POWERTRAIN CONTROL MODULE

PCI BUS - INSTRUMENT CLUSTER

(F21) FUSED IGNITION SWITCH OUTPUT (RUN/START) CIRCUIT SHORT TO GROUND

(F1) FUSED IGNITION SWITCH OUTPUT (OFF/RUN/START) CIRCUIT SHORT TO GROUND

(F21) FUSED IGNITION SWITCH OUTPUT (RUN/START) CIRCUIT OPEN

(F1) FUSED IGNITION SWITCH OUTPUT (OFF/RUN/START) CIRCUIT OPEN

(Z18) INSTRUMENT CLUSTER GROUND CIRCUIT FOR AN OPEN

INSTRUMENT CLUSTER

Diagnostic Test

1.

NO RESPONSE - PCI BUS

NOTE: NOTE: Diagnose and repair any MIC, PCM (ECM if diesel equipped), or Communication DTCs before
proceeding with this test.
Turn the ignition on.

With the DRBIII

T

, select System Monitors, then J1850 Module Scan.

Does the DRBIII

T

display MIC PRESENT on the BUS?

Yes

>> Go To 2

No

>> Refer to the COMMUNICATION category and perform the appropriate symptom.

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

2.

NO RESPONSE - PCI BUS - POWERTRAIN CONTROL MODULE

Turn the ignition on.

With the DRBIII

T

, select Body, MIC, SYSTEM TESTS, PCM Monitor.

Does the DRBIII

T

display PCM INACTIVE on the BUS?

Yes

>> Refer to the COMMUNICATION category and perform the appropriate symptom.

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

No

>> Go To 3

3.

PCI BUS - INSTRUMENT CLUSTER

Turn the ignition on.

With the DRBIII

T

, select Body, MIC, MODULE DISPLAY.

Does the DRBIII

T

display NO RESPONSE from MIC?

Yes

>> Refer to the COMMUNICATION category and perform the appropriate symptom.

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

No

>> Go To 4

DR/DH

INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS

8J - 65

*ALL GAUGES INOPERATIVE (CONTINUED)

4.

CHECK THE (F21) FUSED IGNITION SWITCH OUTPUT (RUN/START) CIRCUIT FOR A SHORT TO
GROUND

Turn the ignition off.

Inspect the #20 Fuse in the PDC.

If the fuse is open, replace with proper rated fuse.

Turn the ignition on for one minute.

Turn the ignition off.

Inspect the #20 Fuse in the PDC.

Is the fuse open?

Yes

>> Repair the (F21) Fused Ignition Switch Output (Unlock/

Run) circuit for a short to ground.

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

No

>> Go To 5

5.

CHECK THE (F1) FUSED IGNITION SWITCH OUTPUT (OFF/RUN/START) CIRCUIT FOR A SHORT TO
GROUND

Turn the ignition off.

Remove and inspect the #29 Fuse in the PDC.

If the fuse is open, replace with the proper rated fuse.

Turn the ignition on for 1 minute.

Turn the ignition off.

Remove and inspect the #29 Fuse in the PDC.

Is the fuse open?

Yes

>> Repair the (F1) Fused Ignition Switch Output (Run/Start)

circuit for a short to ground.

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

No

>> Go To 6

8J - 66

INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS

DR/DH

*ALL GAUGES INOPERATIVE (CONTINUED)

6.

CHECK THE (F21) FUSED IGNITION SWITCH OUTPUT (RUN/START) CIRCUIT FOR AN OPEN

Turn the ignition off.

Disconnect the Instrument Cluster C3 harness connector.

Turn the ignition on.

Measure the voltage between the (F21) Fused Ignition Switch Output
(Run/Start) circuit and ground.

Is the voltage below 10.5 volts?

Yes

>> Repair the (F21) Fused Ignition Switch Output (Run/Start)

circuit for an open.

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

No

>> Go To 7

7.

CHECK THE (F1) FUSED IGNITION SWITCH OUTPUT (OFF/RUN/START) CIRCUIT FOR AN OPEN

Turn the ignition off.

Disconnect the Instrument Cluster C3 harness connector.

Turn the ignition on.

Measure the voltage between the (F1) Fused Ignition Switch Output
(Off/Run/Start) circuit and ground.

Is the voltage below 10.5 volts?

Yes

>> Repair the (F1) Fused Ignition Switch Output (Off/Run/

Start) circuit for an open.

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

No

>> Go To 8

DR/DH

INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS

8J - 67