Circuit Description

TBC module monitors voltage on circuit No. 755 (Black wire) between TBC module and BBEC. If TBC module does not command the RAP relay on and ignition switch is in RUN position, then turned off with door closed, and voltage on circuit is high, DTC will set. TBC module uses this circuit to turn on RAP relay. TBC also monitors the ignition switch position based on ignition signal inputs. TBC module performs a self-test on power up.

Conditions for setting DTC:

• RAP relay signal from TBC remains high.
• Ignition switch is turned from RUN to OFF position with door closed.
• System voltage 9-16 volts.
• Conditions met for .5 second.