Instrument Cluster - Intermittent Erratic Displays
NO.: 08-26-92GROUP: Electrical
DATE: Nov. 30, 1992
SUBJECT:
Excessive Ignition Off Draw (IOD) and/or Component Display Errors Because Of Transistor Failure
MODELS:
1992 (AA) Spirit/Acclaim/Lebaron Sedan
(AG) Daytona
(AJ) Lebaron Coupe/Lebaron Convertible
(AN) Dakota
(AP) Shadow/Shadow Convertible/Sundance
(AS) Caravan/Grand Caravan/Caravan CV
Voyager/Grand Voyager/Town & Country
(AY) Imperial/New Yorker Fifth Avenue
SYMPTOM/CONDITION:
The following list describes the various symptoms that could be caused by a transistor failure. The symptoms are listed by the different electronic components that are involved. A component may display one or more of the symptoms.
AJ - Electronic Instrument Cluster (EIC)
Intermittent erroneous or erratic display
Part of display at twice the normal brightness
Abnormal Ignition Off Draw (IOD) of 40mA or 550mA with no visible indication
AS - Electronic Instrument Cluster (EIC) (Town & Country only)
Intermittent erroneous or erratic display
Part of display at twice the normal brightness
Abnormal Ignition Off Draw (IOD) of 40mA or 550mA with no visible indication
Check engine lamp on at all times with ignition on. 40mA IOD
Check gauge lamp on at all times with ignition on. 40mA IOD
AA, AG, AJ, AN and AP - Mechanical Cluster Tachometer Drive
Loss of tachometer returning to zero with ignition off
Abnormal Ignition Off Draw (IOD) of 130mA
AJ and AY - Overhead Console Electronic Vehicle Information Center (EVIC)
Abnormal Ignition Off Draw (IOD) of 265mA with no visible indications
DIAGNOSIS:
Determining Cause of Dead Battery - Ignition Off Draw (IOD) Test
The maximum IOD for a vehicle is less than 30mA. The body controller has a thirty second time-out (has current draw for thirty seconds after the ignition is turned off). The Transmission Control Module (TCM) has a 20mA for twenty minutes and the automatic load leveler has up to 500mA draw for sixty minutes after the ignition is turned off or the battery is reconnected. These components must time-out or be disconnected before the IOD measurement is taken. Follow the IOD procedure in section 8A of the electrical, fuel & emissions portion of the appropriate 1992 service manual with the following modifications.
Modify step 4d to read as follows:
After three minutes time has elapsed, the test light should turn off or be dimly lit depending on the electronics the vehicle is equipped with. If the test light remains brightly lit, do not disconnect the test light. Disconnect each fuse or circuit breaker, beginning with the fuses that feed the M1 and/or M11 circuits, until the test light is either off or dimly lit. Use the appropriate wiring diagrams service manual to determine what is on that fuse. Reconnect the fuse and disconnect one component at a time on that fuse and determine if the IOD drops to a normal level (under 30mA). Determine which component causes the high IOD and correct the condition. It is now safe to install a milli-amp meter without damage to the meter and check for low amperage IOD.
Modify step 6 by checking the components listed in the Symptom/Condition section first.
If one of the components is the cause of the excessive IOD, use the Repair Procedure.
AJ or AS Electronic Cluster - Intermittent Erroneous or Erratic Display
This failure may be a constant condition or be extremely infrequent and may reset with cycling of the ignition switch.
1. If the condition is only with one gauge, use section 8E of the electrical, fuel & emissions portion of the appropriate 1992 service manual.
2. If the cluster has erratic displays coming across the entire cluster - replace the cluster.
3. If erroneous or erratic display cannot be verified, look for red lines going across the cluster. These red lines would be difficult to see in daylight, but should be easily seen in the dark. Replace the cluster if red lines are present.
4. If customer complains of repeated random or erratic displays (ghosts) appearing across the entire cluster - replace the cluster.
AS Electronic Cluster - Check Engine Lamp Stays On
1. Check engine controller with the DRB II scan tool for diagnostic trouble codes. Repair as required.
2. If no diagnostic trouble codes are found, use the DRB II scan tool to read the status of the check engine lamp. If the engine controller says the lamp is off, but the lamp is on - replace the electronic cluster.
AS Electronic Cluster - Check Gauges Lamp Stays On
1. Verify gauges are in the normal operating range. If coolant, volt, or oil pressure gauge is out of range, go to section 8E of the 1992 service manual for further diagnosis.
NOTE:
NO GAUGE OPERATION WITH A CHECK GAUGES LAMP ON, IS AN INDICATION OF NO BUS COMMUNICATION. SEE TSB 08-14-92 FOR MORE INFORMATION.
2. Check the body controller for diagnostic trouble codes. Repair as required
3. If no diagnostic trouble codes are found, but the check gauges lamp is on - replace the electronic cluster.
PARTS REQUIRED:
AR Tachometer Drive Module - AA, AG, AJ, AP and AN 4375410
AR EVIC Electronic Board - AJ exchange 5269234
AR EVIC Electronic Board - AY exchange 4685040
AR Electronic Cluster - AJ exchange 5269401
AR Electronic Cluster - AS exchange 4685011
REPAIR PROCEDURE:
This bulletin involves replacement of a defective electronic component as determined by the diagnosis above.
1. Identify the defective component using the Symptom/Condition and Diagnosis procedure above.
2. Select the appropriate replacement part from the parts list above.
3. Replace the component using the procedure in the appropriate section of the 1992 service manual.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No.
08-08-01-90 Diagnosis 0.6 Hrs.
Refer to the appropriate Labor Operation Time Schedule for existing Labor Operation and Time Allowance for replacement or exchange.
FAILURE CODE: 58 - Internal Defect