Electrical Circuit Inspection Procedure

1. Continuity Check
2. Voltage Check

   If an open circuit occurs as seen in Fig 1, it can be found by performing Step 2 (Continuity Check Method) or Step  3 (Voltage Check Method) as shown below.

   Fig 1: Open Circuit

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Specification (Resistance) 

1Ω or less → Normal Circuit

1MΩ or Higher → Open Circuit

1. Disconnect connectors (A), (C) and measure resistance between connector (A) and (C) as shown in Fig 2. In Fig 2. the measured resistance of line 1 and 2 is higher than 1MΩ and below 1 Ω respectively. Specifically the open circuit is line 1 (Line 2 is normal). To find exact break point, check sub line of line 1 as described in next step.
   Fig 2: Measuring Resistance Between Connector (A) & (C)

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2. Disconnect connector (B), and measure for resistance between connector (C) and (B1) and between (B2) and (A) as shown in Fig 3.

   In this case the measured resistance between connector (C) and (B1) is higher than 1MΩ and the open circuit is between terminal 1 of connector (C) and terminal 1 of connector (B1).

   Fig 3: Measuring Resistance Between Connector (C) & (B1)

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1. With each connector still connected, measure the voltage between the chassis ground and terminal 1 of each connectors (A), (B) and (C) as shown in Fig 4.

   The measured voltage of each connector is 5V, 5V and 0V respectively. So the open circuit is between connector (C) and (B).

   Fig 4: Measuring Voltage Between Chassis Ground & Terminal 1 Of Connectors (A), (B) & (C)

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