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 is in off with door open, and voltage on circuit is low, 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:

• Retained Accessory Power (RAP) relay signal from TBC remains low with ignition off and door open.
• System voltage 9-16 volts.
• Conditions met for .5 second.