ABS & A/C- Diagnosis/Data Line Update

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Bulletin 91-8-4

Date Oct. '90

Ref. No. 91-019-8

Corp. Ref. No. 008118


SUBJECT:
ELECTRICAL SYSTEMS MANUAL (ESM) UPDATE - ELECTRICAL DIAGNOSIS/DATA LINE

MODELS AFFECTED:
1991 PARK AVENUE/ULTRA


This service bulletin reflects a design change to the 1991 Park Avenue/Ultra Data Line. The Electronic Brake Control Module (EBCM) has been removed from the existing Data Line and placed on a dedicated Data Line. The existing Data Line is still accessed at Pin M of the Assembly Line Diagnostic Link (ALDL). The new EBCM Data Line is accessed at Pin L of the ALDL.

Software for CAMS and TECH1 has been updated to reflect the change.

The following pages/diagnostic test affected by this change contained herein:

ANTILOCK BRAKE SYSTEM





PAGE 104 TEST M: EBCM VOLTAGE TEST





PAGE 105 TEST Q: SERIAL DATE LINE TEST (NEW TEST)


DUAL AIR CONDITIONING (CJ2)





PAGE 388 TEST C: HVAC PROGRAMMER TEST





PAGE 389 TEST D: SERIAL DATA LINE TEST


In addition, the following pages should be revised to reflect late production changes.





PAGE 45 DATA LINE





PAGE 91 ANTILOCK BRAKE SYSTEM





PAGE 103 ANTILOCK BRAKE SYSTEM





PAGE 379 DUAL AIR CONDITIONING (CJ2)