Open Circuit Test

• Continuity Check
• Voltage Check

If an open circuit occurs (as seen in [Figure below]), it can be found by performing Step 2 (Continuity Check Method) or Step  3 (Voltage Check Method) as shown below.

Courtesy of HYUNDAI MOTOR AMERICA

Specification (Resistance) 

1Ω or less → Normal Circuit

1MΩ or Higher → Open Circuit

1. Disconnect connectors (A) and (C), and measure resistance between connectors (A) and (C) as shown in [Figure below].

   In [Figure below], if the measured resistances in lines 1 and 2 are "over 1MΩ" and "below 1Ω" respectively, line 1 has an open circuit. (Line 2 is normal.) To find the exact broken point, check the sub line of line 1 as described in the next step.

   Courtesy of HYUNDAI MOTOR AMERICA

2. Disconnect connector (B), and measure the resistances between connectors (C) and (B1), and between (B2) and (A) as shown in [Figure below].

   In this case, the measured resistance between connectors (C) and (B1) is higher than 1MΩ and the open circuit is between terminal 1 of connector (C) and terminal 1 of connector (B1).

   Courtesy of HYUNDAI MOTOR AMERICA

1. With each connector still connected, measure the voltage between the chassis ground and terminal 1 of each of connectors (A), (B) and (C) as shown in [Figure below].

   The measured voltages of connectors are 5V, 5V and 0V respectively. So the open circuit is between connectors (C) and (B).

   Courtesy of HYUNDAI MOTOR AMERICA