GM Service Manual Online
For 1990-2009 cars only

Dash Integration Module (DIM)

Reverse Lockout Relay Drive: Display indicates ON when the dash integration module grounds the control circuit of the reverse lockout relay.

Ignition 0: Display indicates ON when the ignition 0 input circuit of the module receives a battery signal from the ignition switch

Ignition 1: Display indicates ON when the ignition 1 input circuit of the module receives a battery signal from the ignition switch

Rear Integration Module (RIM)

Brake to Shift Output: Displays indicates ON when the body control module applies power to the automatic transmission shift lock control power feed circuit.

Ignition 0: Display indicates ON when the ignition 0 input circuit of the module receives a battery signal from the ignition switch

Ignition 1: Display indicates ON when the ignition 1 input circuit of the module receives a battery signal from the ignition switch

Powertrain Control Module (PCM)

Ignition Voltage: Displays 0.0-25.5 V. This parameter is the system voltage measured by the PCM at the PCM ignition input when the ignition switch is in the RUN position.

IMS (Transmission Internal Mode Switch) Range: Displays Park, Park/Reverse, Reverse, Reverse/Neutral, Neutral, Neutral/Drive 4, Drive 4, Drive 4/Drive 3, Drive 3, Drive 3/Drive 2, Drive 2, Drive 2/Drive 1, Drive 1, Invalid or Open. The IMS Range display represents a decoded status of the four inputs from the IMS. This range includes all possible in-between gear states as well as the detent gear states. The combination of IMS inputs to the PCM are used by the PCM in order to determine what position the manual valve is in at any time.

IMS (Internal Mode Switch) States A/B/C/P: Displays LOW or HI for the state of each of the four inputs from the IMS. LOW displayed indicates a low voltage signal (0 volts) being monitored at the PCM. HI displayed indicates a high voltage signal (B+) being monitored at the PCM.