Electrical Circuit Inspection Procedure: Notes

• Check Open Circuit

1. Procedures for Open Circuit
   • Continuity Check
   • Voltage Check

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

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2. Continuity Check Method

   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 [Figure below].

      In [Figure below] 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.

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

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3. Voltage Check Method
   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 [Figure below].

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

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