Kia Optima: Body Electrical System

Kia Optima DL3 2019-2020 Service and Repair Manual / Body Electrical System

General information
General Troubleshooting Information

Before Troubleshooting

1.

Check applicable fuses in the appropriate fuse/relay box.

2.

Check the battery for damage, State Of Charge (SOC), cleanliness and tight connections.

  

Do not quick-charge a battery unless the battery ground cable has been disconnected, otherwise you will damage the alternator diodes.

Do not attempt to crank the engine with the battery ground cable loosely connected or you will severely damage the wiring.

3.

Check the alternator belt tension.

Handling Connectors

1.

Make sure the connectors are clean and have no loose wire terminals.

2.

Make sure multiple cavity connectors are packed with grease (except watertight and oxygen sensor connectors).

3.

All connectors have push-down release type locks (A).

4.

Some connectors have a clip on their side used to attach them to a mount bracket on the body or on another component. This clip has a pull type lock.

5.

Some mounted connectors cannot be disconnected unless you first release the lock and remove the connector from its mounting bracket (A).

6.

Never try to disconnect connectors by pulling on their wires; pull on the connector halves instead.

7.

Always reinstall plastic covers.

8.

Before connecting connectors, make sure the terminals (A) are in place and not bent.

9.

Check for loose retainer (A) and rubber seals (B).

10.

The back of some connectors are packed with grease. Add grease if necessary. If the grease (A) is contaminated, replace it.

11.

Insert the connector all the way and make sure it is securely locked.

12.

Position wires so that the open end of the cover faces down.

Handling Wires And Harnesses

1.

Secure wires and wire harnesses to the frame with their respective wire ties at the designated locations.

2.

Remove clips carefully; don't damage their locks (A).

3.

Slip pliers (A) under the clip base and through the hole at an angle, and then squeeze the expansion tabs to release the clip.

4.

After installing harness clips, make sure the harness doesn't interfere with any moving parts.

5.

Keep wire harnesses away from exhaust pipes and other hot parts, from sharp edges of brackets and holes, and from exposed screws and bolts.

6.

Seat grommets in their grooves properly (A). Do not leave grommets distorted (B).

Testing and Repairing

1.

Do not use wires or harnesses with broken insulation.

Replace them or repair them by wrapping the damage wire with electrical tape.

2.

After installing parts, make sure that no wires are pinched under them.

3.

When using electrical test equipment, follow the manufacturer's instructions and those described in this manual.

4.

If possible, insert the remover tool from the wire side (except waterproof connector).

5.

Use a probe with a tapered tip.

Refer to the user's guide in the wiring repair kit (Pub No. : TRK 015.)

Five-step Troubleshooting

1.

Verify the complaint

Turn on all the components in the problem circuit to verify the customer complaint. Note the symptoms. Do not begin disassembling or testing until you have narrowed down the problem area.

2.

Analyze the schematic

Look up the schematic for the problem circuit.

Determine how the circuit is supposed to work by tracing the current paths from the power feed through the circuit components to ground. If several circuits fail at the same time, the fuse or ground is a likely cause.

Based on the symptoms and your understanding of the circuit operation, identify one or more possible causes of the problem.

3.

Isolate the problem by testing the circuit.

Make circuit tests to check the diagnosis you made in step 2. Keep in mind that a logical, simple procedure is the key to efficient troubleshooting.

Test for the most likely cause of failure first. Try to make tests at points that are easily accessible.

4.

Fix the problem

Once the specific problem is identified, make the repair. Be sure to use proper tools and safe procedures.

5.

Make sure the circuit works

Turn on all components in the repaired circuit in all modes to make sure you've fixed the entire problem. If the problem was a blown fuse, be sure to test all of the circuits on the fuse. Make sure no new problems turn up and the original problem does not reoccur.

Installation of the transmitting device.

Electronically controlled computers are designed not to be interrupted by other radio signals, but it can be affected by a remote control of even at less than 25 W output if the antenna or cable of a remote control is wired near the computer. To prevent this, follow the directions below.

1.

Install the antenna on the roof or rear bumper.

2.

Keep the antenna cables at least 200 mm away from the computer or wiring as they transmit radio signals.

3.

Decrease the standing-wave ratio by using proper antennas and cables.

4.

Do not install remote control with high output signals.

5.

After installing the remote control, check the engine by generating radio signals with the engine at idle.

  

The standing-wave ratio : When connected to cables and antennas of different impedence, the input impedence Zin changes based on the length of cable and remote control frequency, and the voltage range also changes based on position.

This rate of the maximum and the minimum voltage is called the standing-wave ratio, and also refers to the rate of the antenna impedance and cable impedance.

The volume of radio signals from cables is proportional to the standing-wave ratio volume, hence the influence to electronic parts increases.

Power Window and Sunroof Reset

If negative (-) battery cable was removed or fuse was replaced while opening/closing the power window or sunroof, perform initialization again as the default value of motor is erased.

System
Resetting
Auto up/down
window
  

Reset the window motor to its default settings in the following cases:

In case of discharged battery, battery replacement or no power supplied to the power window module or replacement. Also, if power was intermittently cut while actuating power windows (open/close).

Whenever the battery is disconnected or discharged, or the related fuse is replaced or reinstalled, reset the Auto up/down window system according to the procedure below.
1)

Turn the ignition "ON".

2)

Pull up the power window switch until the window is fully closed and keep pulling it up for about 1 second.

Sunroof
6.

Turn the ignition to the ON position or start the engine. We recommend resetting the sunroof while the engine is running.

7.

Close the sunroof completely if opened

8.

Release the sunroof switch.

9.

Move the sunroof switch in the direction of close until the sunroof moves tilt up. Then, release the switch.

10.

Move the sunroof switch forward in the direction of close, until the sunroof operates in the following sequence:

Tilt down → Slide Open → Slide Close

  

Do not release the switch until the operation is completed. If you release the switch during operation, try again starting from step 2.

11.

Release the sunroof switch after all operation has completed.

(The sunroof system has been reset.)


Trip computer, Clock and Audio Reset

When reconnecting the battery cable after disconnecting, recharging battery after discharged or installing the memory fuse located on the driver's side panel after removing, be sure to reset systems mentioned on the table below.

In addition, when replacing or reinstalling the fuses after removing, reset according to the table below.

System
Resetting
Trip computer
If the battery has been disconnected, the trip computer will be reinitialized after reconnecting the battery. Explain this to customer.
Clock
If the battery terminals or related fuses have been disconnected, you must reset the time in the audio head unit. (Refer to "Audio" in owner's manual.)
Audio
If the battery has been disconnected, the customer's preset radio stations will be initialized. Record the customer's preset radio stations prior to servicing, and set the customer's preset radio stations into the audio after service.

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