Traction Control Indicator On, DTC 73 Set (63-50-16)

Publication date: 1996-05-01
Reference number: 63-50-16

TRACTION CONTROL INDICATOR ON, DTC 73 SET

TECHNICAL SERVICE BULLETIN

Reference Number(s): 63-50-16

TRACTION CONTROL INDICATOR "ON", DIAGNOSTIC TROUBLE CODE (DTC) 73 SET (REPLACE EBTCM)

Model(s): 1996 Cadillac Concours, DeVille, Eldorado Seville

Section: 5 - Brakes

Bulletin No.: 63-50-16

Date: May, 1996

VEHICLES AFFECTED

1996 Cadillac Concours, DeVille and Eldorado Seville built prior to the following VIN breakpoints:

VIN BREAKPOINTS INFORMATION

Model	VIN Breakpoint
Concours/DeVille	280478
Eldorado	614516
Seville	826978

CONDITION

Some owners may comment on the Traction Control Indicator coming "ON". Also, Diagnostic Trouble Code (DTC) 73 may set.

CAUSE

An EBTCM software deficiency may cause a false DTC 73 to set when certain driver initiated actions occur in the normal operation of the vehicle. This may occur if the ignition switch is "parked" between the RUN and OFF positions or on console blower equipped vehicles if the blower speed control is left in the HIGH position when the ignition is turned OFF.

NOTE: It is not always possible to create the code or cause the telltale to light.

CORRECTION

Determine the DTC 73 is not set because of a legitimate malfunction in the vehicle. Perform the diagnostic steps outlined for DTC 73 in Section 5E2 of the 1996 Cadillac Product Service Information Manual. Also refer to DTC 73 Diagnostic Aids in Section 5E2.
NOTE: Do not change the EBTCM until you have read through and followed the Service Manual trouble tree and Diagnostic Aid. Changing the EBTCM before following the proper diagnosis could lead to unnecessary time and expense and may not correct the condition.
If the diagnostic trouble tree and aid does not correct the condition, check the EBTCM software level using a scan tool or on-board parameters: "TCS Data Parameter TC D07, ECU ID B". If the parameter reads "4065", replace the EBTCM with P/N 25633191. The new module will have a parameter value of "4205".

NOTE: Any vehicle built after the above breakpoints will already have the updated EBTCM. The part number has not changed; however, the software has been upgraded.

PARTS INFORMATION

Parts are currently available from GMSPO.

WARRANTY INFORMATION

For vehicles repaired under warranty, use:

LABOR OPERATION NO.: H2505

LABOR TIME: Use published labor operation time.