Hyundai Tucson: Electrical Circuit Inspection Procedure

• Check Open Circuit

1. Procedures for 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.

2. Continuity Check Method

WARNING

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

Specification (Resistance)

1 or less → Normal Circuit 1M or Higher → Open Circuit

a.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 1M and below 1 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.

b.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 1MQ and the open circuit is between terminal 1 of connector (C) and terminal 1 of connector (B1).

3. Voltage Check Method

a.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).

Check Short Circuit

1. Test Method for Short to Ground Circuit

• Continuity Check with Chassis Ground

If short to ground circuit occurs as shown in FIG. 5, the broken point can be found by performing Step 2 (Continuity Check Method with Chassis Ground) as shown below.

2. Continuity Check Method (with Chassis Ground)

WARNING

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

Specification (Resistance)

1 or less → Short to Ground Circuit 1M or Higher → Normal Circuit

a. Disconnect connectors (A), (C) and measure for resistance between connector (A) and Chassis Ground as shown in FIG. 6.

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

b. Disconnect connector (B), and measure the resistance between connector (A) and chassis ground, and between (B1) and chassis ground as shown in FIG. 7.

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

Testing For Voltage Drop

This test checks for voltage drop along a wire, or through a connection orswitch.

1. Connect the positive lead of a voltmeter to the end of the wire (or to the side of the connector or switch) closest to the battery.
2. Connect the negative lead to the other end of the wire. (or the other side of the connector or switch)
3. Operate the circuit.
4. The voltmeter will show the difference in voltage between the two points. A difference, or drop of more than 0.1 volts (50mV in 5 V circuits), may indicate a problem. Check the circuit for loose or dirty connections.

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