Check 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 Checking Method

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Specification (Resistance)

1Ω 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) Or (B1) And Between (B2) Or (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 5V, 5V and 0V respectively. So the open circuit is between connector (C) and (B).

   Fig 4: Measuring Voltage Of Each Connector

   Courtesy of HYUNDAI MOTOR CO.