Electrical Circuit Inspection Procedure

• Check Open Circuit
  1. Procedures for Open Circuit
     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: Checking Open Circuit

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  2. Continuity Check Method
     NOTE: When measuring for resistance, lightly shake the wire harness above and below or side to side.

     Specification (Resistance) 

     1 Ω or less → Normal Circuit

     1 MΩ 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: Identifying Continuity Check Method

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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 1 MΩ 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)

        Courtesy of HYUNDAI MOTOR CO.
  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 Fig 4.

        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).

        Fig 4: Identifying Voltage Check Method

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■ Check Short Circuit 

1. Test Method for Short to Ground Circuit
   1. Continuity Check with Chassis Ground

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

   Fig 5: Checking Short Circuit

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2. Continuity Check Method (with Chassis Ground)
   NOTE: Lightly shake the wire harness above and below, or from side to side when measuring the resistance.

   Specification (Resistance) 

   1 Ω or less → Short to Ground Circuit

   1 MΩ 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 1 MΩ 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: Identifying Continuity Check Method (With Chassis Ground)

      Courtesy of HYUNDAI MOTOR CO.
   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 1 Ω or less. The short to ground circuit is between terminal 1 of connector (C) and terminal 1 of connector (B1).

      Fig 7: Measuring Resistance Between Connector & Chassis Ground

      Courtesy of HYUNDAI MOTOR CO.