Electrical Circuit Inspection Procedure

• 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
   NOTE:

   • When measuring the resistance, lightly shake the wire harness vertically or horizontally.

   Specification (Resistance) 

   1Ω or less → Normal Circuit

   1MΩ or Higher → Open Circuit

   1. Disconnect connectors (A) and (C) and measure resistance between connectors (A) and (C) as shown in [Figure below].

      In [Figure below], the measured resistance is higher than 1MΩ for line 1 and lower than 1Ω for line 2. Specifically, the open circuit is in line 1. (Line 2 is normal.) To find exact breaking point, check sub line of line 1 as described in the following step.

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   2. Disconnect the connector (B), and measure the resistance between connectors (C) and (B1) and between (B2) and (A) as shown in [Figure below].

   In this case, the measured resistance between connectors (C) and (B1) is higher than 1MΩ 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 of connectors (A), (B) and (C) as shown in [Figure below].

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

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