Electrical Circuit Inspection Procedure

CHECK OPEN CIRCUIT
1. Procedures for Open Circuit
  - 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: Identifying Open 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) & (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) & (B1) & Between (B2) & (A)
    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 & Terminal 1 Of Each Connectors (A), (B) & (C)
    Courtesy of HYUNDAI MOTOR CO.
CHECK SHORT CIRCUIT
1. Test Method for Short to Ground Circuit
  - 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: Identifying Short Circuit
  Courtesy of HYUNDAI MOTOR CO.
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)
  
  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: Measuring Resistance Between Connector (A) & 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 1Ω 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 (A) & Chassis Ground, & Between (B1) & Chassis Ground
    Courtesy of HYUNDAI MOTOR CO.