Diagnostic Aids

Tests requiring a connection at Universal Breakout Box (J 39700) terminal No. 3 are using this terminal as ground. This assumes ground circuit No. 801 is okay.

If cruise control will not engage and ASR ACTIVE indicator is always on, fault is probably a short to battery voltage on circuit No. 1679.

Fig 1: Code 57 Schematic - Cruise Control Output Monitoring Fault

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code 57 Flow Chart - Cruise Control Output Monitoring Fault

Courtesy of GENERAL MOTORS CORP.