PI89: Stoplight Switch

WARNING: This page is about a different car, the 1995 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

This input comes through the data link from the EBTCM. PI89 should be LO with brake pedal released and HI with brake pedal depressed.

Fig 1: Identifying Red PCM Harness Connector

Courtesy of GENERAL MOTORS CORP.

Fig 2: Identifying White PCM Harness Connector

Courtesy of GENERAL MOTORS CORP.

Fig 3: Identifying Blue PCM Harness Connector

Courtesy of GENERAL MOTORS CORP.

NOTE: All PCM specific output tests are to be performed with key on, engine off.

PCM OUTPUTS option provides ability to cycle PCM-controlled outputs. DIC display identifies solenoid or relay and state PCM is commanding that device. HI indicates solenoid or relay is de-energized and LO indicates solenoid or relay is energized. See Figure .