Circuit Description

TBC module monitors voltage in circuit No. 352 (White wire) to determine if headlight power relay was requested ON. See WIRING DIAGRAMS  . If battery voltage is not sensed in this circuit and TBC is requesting headlight relay on, DTC will set. TBC module uses this circuit (White wire) to determine actual state of headlight power relay circuit. TBC module also monitors ignition switch position based on ignition signal inputs.

Conditions for setting DTC:

• Headlights in AUTO position.
• When there is short to ground in circuit No. 352 White wire).
• System voltage 9-16 volts.
• Conditions present for .5 second.