Cruise Control - Included Inoperative Diagnosis

90cadillac11
Bulletin No. T-90-96
File in Group 9
Number 69
Corp. Ref. No. 019013
Date July, 1990
SUBJECT: SERVICE INFORMATION MANUAL UPDATE - SECTION 8A CELL 34 CRUISE CONTROL (UPDATE ON DIAGNOSIS)

MODELS AFFECTED: 1987-1989 ALLANTES 1990 ELDORADOS AND SEVILLES
Please update your 1987-1989 Allante Service Information Manuals and 1990 Eldorado and Seville Service Information Manual, Section 8A cell 34, to include the following information regarding inoperative cruise control diagnosis.

Figure 1 - VCC Brake Input:

The VCC brake switch and the stop lamp/cruise switch are inputs to the ECM (EI71 and EI70 respectively). An open in either switch could result in inoperative cruise control or cruise control that intermittently will not operate. The affected models should include the VCC brake input EI71 as shown in Figure 1.

Additionally the 1987-1988 edition of the Allante manual, page 8A-34-0, indicates "Cruise Enable Input" EI78. This input should be "Cruise Brake Input" EI70. This page should also include "VCC Brake Input" EI71 as shown in Figure 1.

Table 1:

The procedure in Table 1 should be included in all cruise control system diagnosis for the affected models.