Electrical Circuit Inspection Procedure

Check Open Circuit

Procedures for Open Circuit

Continuity Check
Voltage Check

If an open circuit occurs (as seen in the illustration 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

Continuity Check Method

NOTE:

When measuring for resistance, lightly shake the wire harness above and below or from side to side.

Specification (Resistance)

1Ω or less → Normal Circuit

1MΩ or Higher → Open Circuit

Disconnect connectors (A), (C) and measure resistance between connector (A) and (C) as shown in the illustration below .

In the illustration below, 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.

Courtesy of HYUNDAI MOTOR AMERICA

Disconnect connector (B), and measure for resistance between connector (C) and (B1) and between (B2) and (A) as shown in the illustration below .

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).

Courtesy of HYUNDAI MOTOR AMERICA

Voltage Check Method

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 the illustration below .

The measured voltage of each connector is 5V, 5V and 0V respectively. So the open circuit is between connector (C) and (B).

Courtesy of HYUNDAI MOTOR AMERICA

Check Short Circuit

Test Method for Short to Ground Circuit

Continuity Check with Chassis Ground
If short to ground circuit occurs as shown in the illustration below , the broken point can be found by performing Step 2 (Continuity Check Method with Chassis Ground) as shown below.

Courtesy of HYUNDAI MOTOR AMERICA

Continuity Check Method (with Chassis Ground)

NOTE:

Lightly shake the wire harness above and below, or from side to side when measuring the resistance.

Specification (Resistance)

1Ω or less → Short to Ground Circuit

1MΩ or Higher → Normal Circuit

Disconnect connectors (A), (C) and measure for resistance between connector (A) and Chassis Ground as shown in the illustration below

The measured resistance of line 1 and 2 in this example is below 1Ω and higher than 1MΩ 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.

Courtesy of HYUNDAI MOTOR AMERICA

Disconnect connector (B), and measure the resistance between connector (A) and chassis ground, and between (B1) and chassis ground as shown in the illustration below .

The measured resistance between connector (B1) and chassis ground is 1Ω or less. The short to ground circuit is between terminal 1 of connector (C) and terminal 1 of connector (B1).

Courtesy of HYUNDAI MOTOR AMERICA