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TSB 08-016-02

Horn Chirp and Erroneous Alarm

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Date: September 2, 2002

Models: 2002 - 2003 (DR) Ram Truck

Overview:
This bulletin involves reprogramming the Forward Control Module (FCM)

Symptom/Condition:
Two conditions have been identified which could be caused by electronic communication errors between the Forward Controller Module (FCM) and other electronic modules on the vehicle:

The first condition can occur after a vehicle has been turned off and allowed to sit for more than a three minutes. A very brief horn chirpcan sometimes be heard when a door is opened. When the engine is turned off the electronic modules continue to function, or stay awake for two to three minutes after shut down. After two to three minutes of inactivity the modules deactivate or go into a sleepmode . When a door is opened, the modules are activated or wake up. The brief horn chirp will occur at the time the modules wake up or when the door is opened. This can occur due to a communication error in the FCM.

The second condition involves vehicles NOTequipped with Vehicle Theft Security System (VTSS) exhibiting an alarm with the horn sounding and lights flashing. This can also be caused by communication errors involving the FCM. Both of these condition have been corrected with software revisions in the FCM. Reprogramming the FCM with the latest software revision (version 5.4) will correct the conditions.

Diagnosis:
If the vehicles exhibit either of the conditions described above, perform the Repair Procedure and reprogram the Front Controller Module (FCM).

Equipment Required:

CH6000	Scan Tool (DRB III)
CH7035	General Purpose Interface Bus Cable (GPIB)
CH7000/7001	J1962 Cable
	MDS2 (Mopar Diagnostic System)

Repair Procedure: 

1.    Connect a battery charger and set as close to a 14 volts charge as possible.

2.     Flash the Front Control Module FCM using the MDS2 (Mopar Diagnostic System) and DRBIII (Scan Tool). The FCM software must be version 5.4 or later.

Policy:    Reimbursable within the provisions of the warranty.

Time Allowance:

Failure Code:  FM - Flash Module

This page was edited on: May 3, 2004