• Check 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.

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 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.

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 Connectors (A), (B) And (C)

   Courtesy of HYUNDAI MOTOR CO.