LANE-KEEP ASSIST SYSTEM MALFUNCTIONS [LANE-KEEP ASSIST SYSTEM]

id1503b4000700

Note

• If there is any vehicle malfunction complaint lodged by a customer, first perform malfunction diagnosis according to the troubleshooting procedure. (See FOREWORD [LANE-KEEP ASSIST SYSTEM].)

Description

• Lane-keep assist system operation differs from driver's intentions in driving situation.

Possible malfunction

Note

• The detection performance of the forward sensing camera (FSC) has limitations and the lane-keep assist system may not operate normally. For the detection performance limitations, refer to the [FORWARD SENSING CAMERA (FSC)] in the service highlight.

• The forward sensing camera (FSC) operation record can be verified using the M-MDS.

• Lane-keep assist system operates incorrectly due to effects of road conditions

― Vehicle is driven on temporary lane or section with closed lane resulting from construction (there might be multiple white lane lines or they are interrupted)

― Vehicle is driven over traffic lane line in construction site.

― Vehicle is driven through intersection, junction, or on forked road

― Markings not completely erased after road maintenance, shaded roads, residual snow, or water puddles are falsely detected as traffic lane lines

― Shadow of guardrail parallel to white lane line is cast on road

― Vehicle is shaken after hitting road bump or driving on undulating road

― There are various road markings or lane markings of various shapes near intersection

• Non-designated part installed

― Non-designated suspension installed

― Non-designated tire installed

― Non-designated windshield installed

• Tire pressure is not adjusted to specified value

• Forward sensing camera (FSC) optical axis adjustment not performed correctly

• EPS CM malfunction

Diagnostic Procedure

Step

Inspection

Action

1

VERIFY DTCs

•  Using the M-MDS, display the DTCs related to the EPS control module and forward sensing camera (FSC).
(See DTC INSPECTION [ELECTRIC POWER STEERING (EPS)].)

(See DTC INSPECTION [FORWARD SENSING CAMERA (FSC)].)

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [ELECTRIC POWER STEERING (EPS)].)

(See DTC TABLE [FORWARD SENSING CAMERA (FSC)].)

No

Go to the next step.

2

INSPECT PHENOMENON DUE TO DETECTION PERFORMANCE LIMITATIONS

•  Refer to the new vehicle instruction and inspect the detection performance of the forward sensing camera (FSC).

•  Inspect the forward sensing camera (FSC) operation record using the M-MDS.

•  Are the applicable items for the detection performance displayed?

Yes

The vehicle is normal. (Explain to the customer that the lane-keep assist system may not operate due to the detection performance limitations of the forward sensing camera (FSC).)

Complete the symptom troubleshooting.

No

Go to the next step.

3

VERIFY DRIVING CONDITION

•  Ask the customer if the condition was any of the following conditions when the malfunction occurred.

―  Vehicle is driven on temporary lane or section with closed lane resulting from construction (there might be multiple white lane lines or they are interrupted)

―  Vehicle is driven over traffic lane line in construction site.

―  Vehicle is driven through intersection, junction, or on forked road

―  Markings not completely erased after road maintenance, shaded roads, residual snow, or water puddles are falsely detected as vehicle lane line

―  Shadow of guardrail parallel to white lane line is cast on road

―  Vehicle is shaken after hitting road bump or driving on undulating road

―  There are various road markings or lane markings of various shapes near intersection

•  Is any of the above driving conditions met?

Yes

The vehicle is normal. (Explain to the customer that the lane-keep assist system does not operate when the DSC operation is cancelled or the vehicle is driven on an extremely narrow or wide road.)

Complete the symptom troubleshooting.

No

Go to the next step.

4

VERIFY HEADLIGHTS

•  Verify the headlights and inspect the windshield visually and verify if any of the following conditions occur.

―  Headlights are dirty

―  Headlight optical axis deviation

•  Do any of the previous conditions occur?

Yes

Repair the malfunctioning location, then go to step 8.

No

Go to the next step.

5

VERIFY INSTALLED NON-DESIGNATED PART

•  Verify that a non-designated part has been installed.

•  Is there a non-designated part installed on the suspension, tire or windshield?

Yes

Explain to the customer that the lane-keep assist system does not operate because a non-designated part has been installed.

No

Go to the next step.

6

VERIFY TIRE PRESSURE

•  Is tire pressure adjusted to specified value?

Yes

Go to the next step.

No

Repair the malfunctioning location, then go to step 8.

7

PERFORM FORWARD SENSING CAMERA (FSC) AIMING

•  Perform the forward sensing camera (FSC) aiming.
(See FORWARD SENSING CAMERA (FSC) AIMING.)

—

Go to the next step.

8

VERIFY MALFUNCTION SYMPTOM

•  Has the malfunction symptom been eliminated?

Yes

Complete the symptom troubleshooting.(Explain repair contents to customer).

No

Repeat the diagnosis from Step 1.

If the malfunction is not resolved, explain to the customer that the lane- keep assist system operates incorrectly due to the effects of road conditions.

Step	Inspection		Action
1	VERIFY DTCs • Using the M-MDS, display the DTCs related to the EPS control module and forward sensing camera (FSC). (See DTC INSPECTION [ELECTRIC POWER STEERING (EPS)].) (See DTC INSPECTION [FORWARD SENSING CAMERA (FSC)].) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [ELECTRIC POWER STEERING (EPS)].) (See DTC TABLE [FORWARD SENSING CAMERA (FSC)].)
1		No	Go to the next step.
2	INSPECT PHENOMENON DUE TO DETECTION PERFORMANCE LIMITATIONS • Refer to the new vehicle instruction and inspect the detection performance of the forward sensing camera (FSC). • Inspect the forward sensing camera (FSC) operation record using the M-MDS. • Are the applicable items for the detection performance displayed?	Yes	The vehicle is normal. (Explain to the customer that the lane-keep assist system may not operate due to the detection performance limitations of the forward sensing camera (FSC).) Complete the symptom troubleshooting.
2		No	Go to the next step.
3	VERIFY DRIVING CONDITION • Ask the customer if the condition was any of the following conditions when the malfunction occurred. ― Vehicle is driven on temporary lane or section with closed lane resulting from construction (there might be multiple white lane lines or they are interrupted) ― Vehicle is driven over traffic lane line in construction site. ― Vehicle is driven through intersection, junction, or on forked road ― Markings not completely erased after road maintenance, shaded roads, residual snow, or water puddles are falsely detected as vehicle lane line ― Shadow of guardrail parallel to white lane line is cast on road ― Vehicle is shaken after hitting road bump or driving on undulating road ― There are various road markings or lane markings of various shapes near intersection • Is any of the above driving conditions met?	Yes	The vehicle is normal. (Explain to the customer that the lane-keep assist system does not operate when the DSC operation is cancelled or the vehicle is driven on an extremely narrow or wide road.) Complete the symptom troubleshooting.
3		No	Go to the next step.
4	VERIFY HEADLIGHTS • Verify the headlights and inspect the windshield visually and verify if any of the following conditions occur. ― Headlights are dirty ― Headlight optical axis deviation • Do any of the previous conditions occur?	Yes	Repair the malfunctioning location, then go to step 8.
4		No	Go to the next step.
5	VERIFY INSTALLED NON-DESIGNATED PART • Verify that a non-designated part has been installed. • Is there a non-designated part installed on the suspension, tire or windshield?	Yes	Explain to the customer that the lane-keep assist system does not operate because a non-designated part has been installed.
5		No	Go to the next step.
6	VERIFY TIRE PRESSURE • Is tire pressure adjusted to specified value?	Yes	Go to the next step.
6		No	Repair the malfunctioning location, then go to step 8.
7	PERFORM FORWARD SENSING CAMERA (FSC) AIMING • Perform the forward sensing camera (FSC) aiming. (See FORWARD SENSING CAMERA (FSC) AIMING.)	—	Go to the next step.
8	VERIFY MALFUNCTION SYMPTOM • Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting.(Explain repair contents to customer).
8		No	Repeat the diagnosis from Step 1. If the malfunction is not resolved, explain to the customer that the lane- keep assist system operates incorrectly due to the effects of road conditions.