FixVault

Code 86 - Anti-Lock Light Fault: Notes

VCM monitors the ANTI-LOCK light circuit. If a problem occurs on the ANTI-LOCK light circuit, VCM turns BRAKE light on and sets Code 86. An incorrect voltage on the low-voltage side of the ANTI-LOCK light circuit will cause Code 86.

Fig 1: Code 86 - Schematic (4.3L M/T - VIN Z)
G95B27129Courtesy of GENERAL MOTORS CORP.
Fig 2: Code 86 - Schematic (Except 4.3L M/T - VIN Z)
G95D27139Courtesy of GENERAL MOTORS CORP.
Fig 3: Code 86 - Brake Switch Circuit - Flow Chart (1 of 2)
G95A27888Courtesy of GENERAL MOTORS CORP.
Fig 4: Code 86 - Brake Switch Circuit - Flow Chart (2 of 2)
G95H27133Courtesy of GENERAL MOTORS CORP.