GM Service Manual Online
For 1990-2009 cars only

Rear Integration Module (RIM)

Ign/Run/Crank: Display indicates ON when the ignition 1 input circuit of the module receives a battery signal from the ignition switch

Brake to Shift Relay: Displays indicates ON when the rear integration module supplies a ground to the brake to shift relay control circuit.

Dash Integration Module (DIM)

Ign/Run/Crank: Display indicates ON when the ignition 1 input circuit of the module receives a battery signal from the ignition switch

Reverse Lockout Control: Displays indicates ON when the dash integration module supplies a ground to the reverse lockout control circuit.