Traction Control Indicator ON, DTC 73 Set
File In Section: 5 - BrakesBulletin No.: 63-50-16
Date: May, 1996
Subject:
Traction Control Indicator "ON", Diagnostic Trouble Code (DTC) 73 Set (Replace EBTCM)
Models:
1996 Cadillac Concours, DeVille, Eldorado Seville Built Prior to VIN Breakpoints:
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.
Important:
It is not always possible to create the code or cause the telltale to light.
Correction
1. 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.
Important:
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.
2. 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".
Important:
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 Labor Time
H2505 Use published labor
operation time.