System Check Chart B-2

You have been directed to this chart from chart B-1 due to one or all of the displays being black and the brake lamps not working.

NOTE: The following step numbers refer to circled numbers on diagnostic chart. See Fig 1 . For circuit identification, see Fig 2 .

Checks for 7-volt input to BCM.
Checks for blown fuse and short to voltage on circuit No. 805.
Checks for 10-volt signal on circuit No. 555. If voltage is present, the problem must be a bad connection at the CPS. If the voltage is not present, then the wire or BCM is suspect.

Fig 1: Identifying Chart B-2 Flow Chart

Courtesy of GENERAL MOTORS CORP.

Fig 2: Identifying Chart B-2 Flow Chart Circuit

Courtesy of GENERAL MOTORS CORP.