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Cluster is DEAD - NO BUS

  
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Cluster is DEAD - NO BUS

 
xx_frankc_xx xx_frankc_xx
New User | Posts: 8 | Joined: 06/13
Posted: 08/01/13
12:45 PM

Hello,.. I have a 2001 dodge ram 1500 5.9L 4X4. The cluster is dead, it has gone dead a few times before and came back on it's own. The cluster reads "NO BUS". All the fuses under the hood and inside are good. The truck still starts and runs good. I've checked all wiring for bad grounds, and fuses none are bad. If the PCM is bad would it still start and run?...
Confused  Confused  Confused  

waynep712222 waynep712222
User | Posts: 127 | Joined: 04/13
Posted: 08/01/13
03:57 PM

this is going to require looking at the wiring diagrams...

let me see if i can find a set...

can you rock the key from the ON position to the off and back on...   ON, off ON, Off ON. OFF on off ON.. with the final position in the ON position within 10 seconds and see if the odometer changes from miles driven to various codes...

or do you have a scan tool????

there are also tests for the cluster by its self..  

waynep712222 waynep712222
User | Posts: 127 | Joined: 04/13
Posted: 08/01/13
04:10 PM

Symptom:
*BUS +/- SIGNALS OPEN OR NO RESPONSE FROM INSTRUMENT CLUSTER

POSSIBLE CAUSES

ATTEMPT TO COMMUNICATE WITH ANOTHER MODULE

OPEN GROUND CIRCUIT(S)

OPEN FUSED IGNITION SWITCH OUTPUT CIRCUITS

OPEN FUSED B+ CIRCUIT(S)

OPEN PCI BUS CIRCUIT

INSTRUMENT CLUSTER

TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, attempt to communicate with the Airbag Control Module (ACM).
With the DRB, attempt to communicate with the Controller Antilock Brake (CAB)
module.
Was the DRB able to I/D or communicate with any of the modules?
All

Yes ! Go To 2

No ! Refer to symptom list for problems related to the PCI Bus
Communication Failure.
Perform BODY VERIFICATION TEST - VER 1.

2 Turn the ignition off.
Turn all lights off.
Disconnect the Instrument Cluster harness connectors.
Using a 12-volt test light connected to 12-volts, probe each ground circuit.
Is the test light illuminated for each circuit?
All

Yes ! Go To 3

No ! Repair the ground circuit(s) for an open.
Perform BODY VERIFICATION TEST - VER 1.

3 Turn the ignition off.
Disconnect the Instrument Cluster harness connectors.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe both Fused Ignition Switch
Output circuits.
Is the test light illuminated for both circuits?
All

Yes ! Go To 4

No ! Repair the Fused Ignition Switch Output circuit for an open or
short. Refer to the wiring diagrams in the service information.

4 Turn the ignition off.
Disconnect the Instrument Cluster harness connectors.
Using a 12-volt test light connected to ground, probe each Fused B+ circuit.
Is the test light illuminated for each circuit?
All

Yes ! Go To 5

No ! Repair the Fused B+ circuit for an open or short. Refer to the
wiring diagrams in the service information.
Perform BODY VERIFICATION TEST - VER 1.
5 Note: Ensure there is PCI Bus communication with other modules on the
vehicle before proceeding. If not, refer to the symptom list from the menu
and repair as necessary.
Disconnect the Instrument Cluster harness connectors.
Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and
black test probes.
Connect the scope input cable to the channel one connector on the DRB. Attach the
red and black leads and the cable to probe adapter to the scope input cable.
With the DRBIIIt select Pep Module Tools.
Select lab scope.
Select Live Data.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts. Set Probe to x10.
Press F2 again when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the Instrument Cluster connector.
Turn the ignition on.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?
All
Yes ! Replace the Instrument Cluster in accordance with the service
information.
Perform BODY VERIFICATION TEST - VER 1.
No ! Repair the PCI Bus circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
196
COMMUNICATION
*BUS +/- SIGNALS OPEN OR NO RESPONSE FROM INSTRUMENT CLUSTER
— Continued

say... Please invest if you have a harbor freight tools near you in one of their computer safe circuit testers..

Image 12931


   Cen-Tech 98709 Computer Safe Automotive Logic Probe
   Computer Safe Automotive Logic Probe
   Item #98709  

waynep712222 waynep712222
User | Posts: 127 | Joined: 04/13
Posted: 08/01/13
04:21 PM

one warning the info above is for  a 2002 ram..

there is a bunch more info.. see what you can diagnose with the above..

your cluster could also be bad..

but please DIAGNOSE FIRST..  

waynep712222 waynep712222
User | Posts: 127 | Joined: 04/13
Posted: 08/01/13
11:21 PM

this is the section i was looking for..

ACTUATOR TEST
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS,
DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE
THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM
CAPACITOR TO DISCHARGE BEFORE PERFORMING
FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS
COULD RESULT IN ACCIDENTAL AIRBAG
DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

The instrument cluster actuator test will put the
instrument cluster into its self-diagnostic mode. In
this mode the instrument cluster can perform a selfdiagnostic
test that will confirm that the instrument
cluster circuitry, the gauges, and the indicators are
capable of operating as designed. During the actuator
test the instrument cluster circuitry will position
each of the gauge needles at various calibration
points, illuminate all of the segments in the Vacuum
Fluorescent Display (VFD) units, turn all of the indicators
on and off again, display any Diagnostic Trouble
Code (DTC) information, and display the number
of ignition key cycles that have occurred since the
DTC was detected. It is suggested that a note pad
and pencil be used to write down any fault information
that is displayed during the test for reference.
Successful completion of the actuator test will confirm
that the instrument cluster is operational. However,
there may still be a problem with the PCI data
bus, the Powertrain Control Module (PCM), the
Front Control Module (FCM), the Transmission Control
Module (TCM), the Transfer Case Control Module
(TCCM), the Airbag Control Module (ACM), the
Controller Anti-lock Brake (CAB), or the inputs to
one of these electronic control modules. Use a
DRBIIIt scan tool to diagnose these components.
Refer to the appropriate diagnostic information.

(1) Begin the test with the ignition switch in the
Off position.

(2) Depress the odometer/trip odometer switch button.

(3) While still holding the odometer/trip odometer
switch button depressed, turn the ignition switch to
the On position, but do not start the engine.

(4) Release the odometer/trip odometer switch button.

(5) The instrument cluster will simultaneously
illuminate all of the operational segments in both
VFD units, perform a bulb check of each operational
LED indicator. The VFD segments and LED indicators
remain illuminated as each gauge needle is
swept to several calibration points and back. If a
VFD segment or an LED indicator fails to illuminate,
or if a gauge needle fails to sweep through the calibration
points and back during this test, the instrument
cluster must be replaced. Following these tests,
the actuator test will proceed as described in Step 6.

(6) The text “C Code” is displayed in the odometer
VFD for about three seconds. If there is no stored
fault information, the display will show two pairs of
zeroes in the format “00” “00”, which indicate that
the display of fault information is done. If there is
stored fault information, two sets of two-digit alpha
and alpha-numeric fault codes will appear in the
odometer display for a three second interval. The
first pair of digits represents a Diagnostic Trouble
Code (DTC), or fault code for the instrument cluster.
The second pair of digits is a counter for the number
of ignition key cycles that have occurred since the
displayed DTC was set. The instrument cluster will
continue to display additional sets of two pairs of digits
at three second intervals until all of the stored
codes have been displayed, which is again signaled
by a code of “00” “00”. Refer to the Instrument Cluster
Failure Message table for a description of each
fault code that the instrument cluster displays. If an
instrument cluster fault is displayed, use a DRBIIIt
scan tool to diagnose the problem. Refer to the appropriate
diagnostic information.  

xx_frankc_xx xx_frankc_xx
New User | Posts: 8 | Joined: 06/13
Posted: 08/02/13
06:51 AM

Hi, yes it can. It flashes 5 times then comes up with "NO BUS". When we scan it, it comes up with a code P1687 - No Cluster Bus Message. We put a cluster from another truck that supposedly works... and nothing. It still starts though. What tests are there on the cluster by its self?  

xx_frankc_xx xx_frankc_xx
New User | Posts: 8 | Joined: 06/13
Posted: 08/02/13
06:58 AM

Wow! I will try this. Thanks! Awesome run down by the way.  

xx_frankc_xx xx_frankc_xx
New User | Posts: 8 | Joined: 06/13
Posted: 08/02/13
07:11 AM

Hey waynep712222, Thanks for all the info. Poor truck has been sitting for a while and I need to get it through inspection. Bought it from a damn kid for $5,700, about 7 months ago. Kid got me good. Found out it had a junkyard motor in it with #8 dead cylinder, plus a junkyard trans. (Not to mention it has a bad heater core). Replaced the motor, now the cluster is dead... but the cluster has been doing this off and on since I got it. It's not coming back on this time. I just want to get it past inspection. I will try all the tests you posted & get back to you. Thanks!  

waynep712222 waynep712222
User | Posts: 127 | Joined: 04/13
Posted: 08/02/13
10:07 AM

start under the hood...

check the grounds from the engine to the firewall...

check the negative battery connection to the fender..  

waynep712222 waynep712222
User | Posts: 127 | Joined: 04/13
Posted: 08/02/13
12:29 PM

check your email.. i send a link..  

xx_frankc_xx xx_frankc_xx
New User | Posts: 8 | Joined: 06/13
Posted: 08/06/13
09:55 AM

Hey Wayne,.. disconnected the ipod wire, took the after market stereo & harness completely out. Cleaned all interior plugs with electronic cleaner & blasted them out with 100 psi air. Cleaned the PCM Plugs (elc cleaner / air) and the ground (wire wheel). Re-checked all grounds & fuses. Cleaned ground behind kick panel. Next will be replace PCM & re-flash it. Keep ya posted. Thanks again.  

waynep712222 waynep712222
User | Posts: 127 | Joined: 04/13
Posted: 08/06/13
09:53 PM

did you find the manuals??