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: Checking Open Circuit

Courtesy of KIA MOTORS AMERICA, INC.

Specification (Resistance)

1ohm or less --> Normal Circuit

1 Mohm 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 1ohm Mohm and below 1 ohm 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 KIA MOTORS AMERICA, INC.
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 1Mohm 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)

   Courtesy of KIA MOTORS AMERICA, INC.

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 And Terminal 1 Of Connectors

   Courtesy of KIA MOTORS AMERICA, INC.