HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT Circuit Inspection (Cont’d)
SGI854
CONTROL UNIT CIRCUIT TEST
NGGI0004S0307
System Description: When the switch is ON, the control unit lights up the lamp.
MGI034A
Input-output voltage chart Pin No.
Item
Condition
Voltage value [V]
In case of high resistance such as single strand [V] *
1
Switch
Switch ON
Battery voltage
Lower than battery voltage Approx. 8 (Example)
Switch OFF
Approx. 0
Approx. 0
Switch ON
Battery voltage
Approx. 0 (Inoperative lamp)
Switch OFF
Approx. 0
Approx. 0
2
Lamp
The voltage value is based on the body ground. * : If high resistance exists in the switch side circuit (caused by a single strand), terminal 1 does not detect battery voltage. Control unit does not detect the switch is ON even if the switch does not turn ON. Therefore, the control unit does not supply power to light up the lamp.
GI-30