DTC B2647: Ambient Light Sensor Circuit Low: Notes

TBC module monitors circuit No. 278 (White wire) to determine when headlights need to be turned on when headlight switch is in AUTO mode. See WIRING DIAGRAMS  . When circuit to TBC module is low, DTC will set.

Conditions for setting DTC:

• Circuit No. 278 (White wire) is shorted to ground or open, or circuit No. 750 (Gray wire) is open.
• System voltage 9-16 volts.
• Conditions met for .5 second.