Electrical Circuit Inspection Procedure

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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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: Measuring Resistance Between Connector (A) And (C)

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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) And (B1) And Between (B2) And (A)

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

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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 Continuity With Chassis Ground

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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: Measuring Resistance Between Connector (A) And 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 (A) And Chassis Ground And Between (B1) And Chassis Ground

   Courtesy of HYUNDAI MOTOR CO.