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 Voltage And Continuity Of Electrical Circuit

      Courtesy of HYUNDAI MOTOR CO.
2. Continuity Check Method
   NOTE: When measuring for resistance, lightly shake the wire harness above and below or from side to side.

   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) And (C)

      Courtesy of HYUNDAI MOTOR CO.
   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) And (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 5V, 5V and 0V respectively. So the open circuit is between connector (C) and (B).

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

      Courtesy of HYUNDAI MOTOR CO.