Fixing the "No Bus" message on gauge cluster
 

First you will want to verify you have a few tools.

1) phillips screwdriver and a regular pair of pliers
2) long nose multi-purpose tool such as this one 3) , I used 16-14. Get a box of 100, as they are nice to have.
4) The connector which is Mopar part # 1-05016261AA. Get two of these from the dealership, $8 per.

The Service Bulletin:

NO: 08-15-99
SUBJECT: Erratic, Intermittent Cluster Operation/Intermittent Air Bag Warning light.
DATE: May 21, 1999
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN NUMBER 08-20-98 REV. A, DATED OCTOBER 2, 1998, WHICH SHOULD BE REMOVED FROM YOUR FILES AND NOTED IN THE BOUND TECHNICAL SERVICE BULLETIN BOOK, PUBLICATION NUMBER 81-699-99003. THIS IS A COMPLETE REVISION TO THE PROCEDURE.

OVERVIEW:
This bulletin involves installing a repair harness containing a revised instrument cluster connector.

SYMPTOM/CONDITION:
Some vehicles may exhibit an intermittent illumination of the air bag warning light or an intermittent tachometer or speedometer drop out. An Airbag Electronic Control Module (AECM) fault code -"No Cluster CCD BUS " message will be present.

DIAGNOSIS:
Using the DRB III®, read and record all active and stored fault codes in the AECM. This condition is caused by minor oxidation of the BUS circuit terminals at the instrument cluster connector. Electrical terminals will show signs of oxidation, which will appear as darkened lines or marks on the cluster male terminals. These often appear as gray or black marks rather than the appearance of oxidation or corrosion usually associated with higher current carrying circuits. This condition will set a "NO CLUSTER CCD BUS" message. The fault code will usually be stored and not active. THIS TECHNICAL SERVICE BULLETIN WILL NOT ADDRESS FUEL OR OIL PRESSURE GAUGE ISSUES. If this fault code is present, either active or stored perform the Repair Procedure.

PARTS REQUIRED:
Qty Part No. Description
1 05016261AA Cluster Connector Patch Harness
1 04856975 Electric Contact Cleaner
2 04778570 Heat Shrink Tubing

Here are pictures of the install procedure.

Step 1. DISCONNECT THE NEGATIVE BATTERY TERMINAL. Remove the dash. There are 3 screws on the plastic kickplate cover, 2 screws on the kick plate, and four screws for the gauge console cover. The center console, and the top portion of the dash simply pop out. You may have to remove the headlight plunger, however I was able to slide mine out without removing it.

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Step 2. Remove the gauge cluster. There are four screws, then the gauges pop out of the connectors.

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Step 3. Crimp the butt connectors onto the new plugs. Then CUT ONLY ONE WIRE AT A TIME off the old connector. The colors may not match up on your model, so be very methodical on matching up the wires by location, not just by color.

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Connect your battery and turn the Ignition on.

After this the "No Bus" message should be gone. If this does not solve your problem, then there are a few other things to check such as:

CPS - Crankshaft Position Sensor can often cause this. Test your CPS, it's easily done with a multi-meter.

The guage cluster itself could be the cause (my issue ultimately). These can be found at junkyards or on ebay.

Possibly the wires from the ECM. Check these with a multi-meter for continuity, cracks, frayed wires, etc.



K