DTC B2618: Courtesy Light Circuit High: Notes

TBC module monitors circuit No. 690 (Gray/Black wire) to determine when courtesy lights are on. See WIRING DIAGRAMS  . When circuit is shorted to battery voltage, DTC will set. TBC module also monitors ignition switch position based on ignition signal inputs. TBC module performs a self-test on power up.

Conditions for setting DTC:

• Circuit No. 690 (Gray/Black wire) is shorted to battery voltage and TBC modules commands courtesy light relay on.
• System voltage 9-16 volts.
• Conditions met for .5 second.