TEHCM Interface Board Manual - Community Spice

TEHCM INTERFACE BOARD MANUALPRNDLSignals (T92TEHCM Only)The PRNDL signals from the T92 TEHCM are logic states that selecttransmission operating modes, including Park, Reverse, Neutral,Drive, and Low. The BTIB electronic drivers sink current to the PRNDLsignals and include a 4.7 kOhm pull-up resistor on each signal.The ground (GND_IMS) from the T92 IMS connector is the return forthe PRNDL drivers. This circuit is current-limited through a 10 Ohmresistor. If the ground fails, all of the PRNDL inputs will also fail.The following figure shows the connectors, pin assignments, andsignal paths for the PRNDL signals.The PRNDL signals sink current through a 10 Ohm resistor and sourcecurrent through a 4.7 kOhm resistor.Ignition/Access/BrakeApply SignalsThe BTIB controls the ignition (IGN), access (ACCESS), and brakeapply (BRAKE_APPLY) outputs to the TEHCM. An optocoupleractivates the signals by sourcing current from the battery voltage. A100 Ohm resistor is added in series to current-limit the output if a shortcondition occurs.The following figure shows the connectors, pin assignments, andsignal paths for the ignition, access, and brake apply signals.November 13, 2008 Signal Routing / 13