Code 86 - EBCM Turned On Red Brake Warning Light: Notes

This test is used for information only. It reflects ability of EBCM/EBTCM to illuminate Red BRAKE warning light. If another code issues a command to illuminate BRAKE warning light, Code 86 will be stored in EEPROM as a history code.

NOTE: Test numbers refer to numbers on diagnostic chart. Use only 10-megohm (minimum) DVOM for all voltage and resistance tests. For identification of circuits and terminals referenced in charts and text, see WIRING DIAGRAM .

Fig 1: Code 86 Diagnostic Flow Chart

Courtesy of GENERAL MOTORS CORP.

Identifies if code other than Code 86 commanded illumination of BRAKE warning light.