Electrical Circuit Inspection Procedure

• Continuity Check
• 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: Voltage Check Method - Circuit Diagram

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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 1 MΩ 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: Resistance Check Method - Circuit Diagram

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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: Resistance Check Method - Circuit Diagram

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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: Voltage Check Method - Circuit Diagram

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• Continuity Check with Chassis Ground

If short to ground circuit occurs as shown in Fig 5, the broken point can be found by performing below Step 2 (Continuity Check Method with Chassis Ground) as shown below.

Fig 5: Continuity Check Method - Circuit Diagram

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Specification (Resistance)

1Ω or less → Short to Ground Circuit

1MΩ or Higher → Normal Circuit

1. Disconnect connectors (A), (C) and measure for resistance between connector (A) and Chassis Ground as shown in Fig 6.

   The measured resistance of line 1 and 2 in this example is below 1 Ω and higher than 1MΩ respectively. Specifically the short to ground circuit is line 1 (Line 2 is normal). To find exact broken point, check the sub line of line 1 as described in the following step.

   Fig 6: Resistance Check Method - Circuit Diagram

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2. Disconnect connector (B), and measure the resistance between connector (A) and chassis ground, and between (B1) and chassis ground as shown in Fig 7.

   The measured resistance between connector (B1) and chassis ground is 1Ω or less. The short to ground circuit is between terminal 1 of connector (C) and terminal 1 of connector (B1).

   Fig 7: Resistance Check Method - Circuit Diagram

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