Control Unit Circuit Test
System Description
- When the switch is ON, the control unit lights up the lamp.
CASE 1
INPUT-OUTPUT VOLTAGE CHART
|
Terminal No. |
Description |
Condition |
Value (Approx.) |
In case of high resistance such as single strand (V) * |
||
|
+ |
- |
Signal name |
Input/Output |
|||
|
1 |
Body ground |
Switch |
Input |
Switch ON |
Battery voltage |
Lower than battery voltage Approx. 8 (Example) |
|
Switch OFF |
0 V |
Approx. 0 |
||||
|
2 |
Body ground |
Lamp |
Output |
Switch ON |
Battery voltage |
Approx. 0 (Inoperative lamp) |
|
Switch OFF |
0 V |
Approx. 0 |
||||
- 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.
CASE 2
INPUT-OUTPUT VOLTAGE CHART
|
Terminal No. |
Description |
Condition |
Value (Approx.) |
In case of high resistance such as single strand (V) * |
||
|
+ |
- |
Signal name |
Input/Output |
|||
|
1 |
Body ground |
Lamp |
Output |
Switch ON |
0V |
Battery voltage (Inoperative lamp) |
|
Switch OFF |
Battery voltage |
Battery voltage |
||||
|
2 |
Body ground |
Switch |
Input |
Switch ON |
0 V |
Higher than 0 Approx. 4 (Example) |
|
Switch OFF |
5 V |
Approx. 5 |
||||
- The voltage value is based on the body ground.
- *: If high resistance exists in the switch side circuit (caused by a single strand), terminal 2 does not detect approx. 0V. Control unit does not detect the switch is ON even if the switch does not turn ON. Therefore, the control unit does not control ground to light up the lamp.