Tests For Improper Displays (BI64 Displays LO With Multi-Function Lever In Normal Position)

1. Disconnect row A of connector C202.
   • If display reads HI, replace Turn Switch.
   • If display reads LO, go to step  2.
2. Disconnect the BCM. Connect a self powered test lamp at BCM connector terminal 1D15.
   • If test lamp lights, check/repair BLU/BLK (663) wire for a short to ground.
   • If test lamp does not light, check BCM terminal 1D15 for a good, clean connection. If connection is good, replace the BCM.

NOTE: For circuit identification, see Fig 1.

Fig 1: Identifying BI91: Left Turn Switch Circuit

Courtesy of GENERAL MOTORS CORP.