Dodge Ram Truck 1500-2500-3500. Manual — part 377

*ALL GAUGES INOPERATIVE (CONTINUED)

8.

CHECK THE (Z18) INSTRUMENT CLUSTER GROUND CIRCUIT FOR AN OPEN

Turn the ignition off.

Disconnect the Instrument Cluster C3 harness connector.

Measure the resistance between ground and the (Z18) Instrument
Cluster Ground circuit.

Is the resistance below 5.0 ohms?

Yes

>> Replace and configure the Instrument Cluster in accor-

dance with the Service Information.

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

No

>> Repair the (Z18) Instrument Cluster Ground circuit for an

open.

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

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INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS

DR/DH

*ANY PCI INDICATOR INOPERATIVE

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

For a complete wiring diagram Refer to Section 8W.

Possible Causes

NO RESPONSE - PCI BUS

NO RESPONSE - INSTRUMENT CLUSTER

INDICATOR MESSAGE NOT RECEIVED

INSTRUMENT CLUSTER

Diagnostic Test

1.

NO RESPONSE - PCI BUS

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 - INSTRUMENT CLUSTER

With the DRBIII

T

, select MIC, then MODULE DISPLAY.

Does the DRBIII

T

display NO RESPONSE from MIC?

Yes

>> Refer to the symptom list for problems related to *NO RESPONSE FROM THE INSTRUMENT CLUS-

TER.

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

No

>> Go To 3

3.

NO RESPONSE - PCI BUS

With the DRBIII

T

, select Body, MIC, MONITORS, PCI BUS MONITORS.

Does the DRBIII

T

display PCM INACTIVE on the BUS?

Yes

>> Refer to the symptom list for problems related to *NO RESPONSE FROM THE POWERTRAIN CON-

TROL MODULE.

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

No

>> Go To 4

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INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS

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*ANY PCI INDICATOR INOPERATIVE (CONTINUED)

4.

INDICATOR MESSAGE NOT RECEIVED

NOTE: NOTE: Diagnose and repair any PCM or BCM DTCs before proceeding with this test.
Perform the Instrument Cluster Self Test.

Depress and hold the Trip Odometer button while turning the ignition from the off to the on position.

Observe the indicator in question.

Did the indicator illuminate?

Yes

>> Refer to the appropriate Service Information category to diagnose the related system.

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

No

>> 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.)

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INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS

DR/DH

*BRAKE WARNING INDICATOR ALWAYS ON

DR/DH

INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS

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