Electrical Circuit Inspection Procedure

WARNING: This page is about a different car, the 2017 Kia Niro. However, it is still accessible from the selected car via links, so may be relevant.

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 2 (Continuity Check Method) or Step 3 (Voltage Check Method) as shown below.
  
  Fig 1: Checking Open Circuit
  Courtesy of KIA MOTORS AMERICA, INC.
2. Continuity Check Method
  NOTE: When measuring the resistance, lightly shake the wire harness vertically and horizontally.
  
  Specification (Resistance)
  
  1Ω or less → Normal Circuit
  
  1MΩ or Higher → Open Circuit
  1. Disconnect connectors (A) and (C), and measure the resistance between connectors (A) and (C) as shown in [Fig 2].
    In [Fig 2], the measured resistances of lines 1 and 2 are higher than 1 MΩ and below 1Ω respectively. Specifically, an open circuit is in line 1.
    
    (Line 2 is normal.) To find the exact broken point, check sub line of line 1 as described in the next step.
    
    Fig 2: Measuring Resistance Between Connectors (A) And (C)
    Courtesy of KIA MOTORS AMERICA, INC.
  2. Disconnect connector (B), and measure the resistances between connectors (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 Resistances Between Connectors (C) And (B1)
    Courtesy of KIA MOTORS AMERICA, INC.
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 voltages of each connector are 5V, 5V and 0V respectively. So the open circuit is between connectors (C) and (B).
  
  Fig 4: Measuring Voltage Between Chassis Ground And Terminal 1 Of Each Connectors
  Courtesy of KIA MOTORS AMERICA, INC.

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 2 (Continuity Check Method with Chassis Ground) as shown below.
  
  Fig 5: Checking Short Circuit
  Courtesy of KIA MOTORS AMERICA, INC.
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) and (C), and measure the resistance between connector (A) and Chassis Ground as shown in [Fig 6].
  The measured resistances of lines 1 and 2 in this example are below 1Ω and higher than 1 MΩ respectively. Specifically, a short to ground circuit is in line 1. (Line 2 is normal.) To find the exact broken point, check the sub line of line 1 as described in the following step.
  
  Fig 6: Measuring Resistance Between Connector (A) And Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
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 Connector (B1) And Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.