Lane Keeping Assist System (LKAS) Symptom Troubleshooting - LKAS indicator (on the MID) does not go off
LKAS indicator (on the MID) does not go off
1.
DTCs check:

DTCs check
?1.
Turn the vehicle to the ON mode.

?2.
Check for DTCs with the HDS.
DTC Description
DTC
   


Are any DTCs indicated?

     
YES
     
     
     
     
NO
     
     
     
Go to step 2.
2.
CAN gateway system DTC check:

CAN gateway system DTC check
?1.
Check for DTCs with the HDS.
DTC Description
DTC
U0029-00 CAN Gateway F-CAN ch A Bus Off
  
U0047-00 CAN Gateway F-CAN ch B Bus Off
  
U3000-49 CAN Gateway Internal Failure
  

Is DTC U0029-00, U0047-00, and/or U3000-49 indicated?

     
YES
     
     
     
     
NO
     
     
     
Go to step 3.
3.
EPS system DTCs check:

EPS system DTCs check
?1.
Check for DTCs with the HDS.
DTC Description
DTC
   

Are any DTCs indicated?

     
YES
     
     
     
     
NO
     
     
     
Go to step 4.
4.
Fuse check 1:

Fuse check 1
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check the following fuse.
Fuse
No. D5 (10 A)
Location
Under-dash fuse/relay box

Is the fuse OK?

     
YES
     
     
     
The fuse is OK. Reinstall the fuse, then go to step 5.
     
NO
     
     
     
Replace the fuse. Turn the vehicle to the ON mode then the OFF (LOCK) mode. If the fuse blows again, repair the short to ground on the No. D5 (10 A) fuse circuit.?
5.
Fuse check 2:

Fuse check 2
?1.
Check the following fuse.
Fuse
No. D7 (10 A)
Location
Under-dash fuse/relay box

Is the fuse OK?

     
YES
     
     
     
The fuse is OK. Reinstall the fuse, then go to step 6.
     
NO
     
     
     
Replace the fuse. Turn the vehicle to the ON mode, then to the OFF (LOCK) mode. If the fuse blows again, repair the short to ground on the No. D7 (10 A) fuse circuit.?
6.
Gauge control module operation check:

Gauge control module operation check
?1.
Turn the vehicle to the ON mode.

Do the indicators come on?

     
YES
     
     
     
Go to step 7.
     
NO
     
     
     
7.
Open wire check (IG1 OPTION line):

Open wire check (IG1 OPTION line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Millimeter wave radar 8P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Millimeter wave radar 8P connector: disconnected
Test point 1
Millimeter wave radar 8P connector No. 1
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The IG1 OPTION wire is OK. Go to step 8.
     
NO
     
     
     
Repair an open in the wire between the millimeter wave radar and the under-dash fuse/relay box.?
8.
Open wire check (GND line):

Open wire check (GND line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Millimeter wave radar 8P connector: disconnected
Test point 1
Millimeter wave radar 8P connector No. 8
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
The GND wire is OK. Go to step 9.
     
NO
     
     
     
Repair an open in the wire between the millimeter wave radar and the body ground (G251).?
9.
F-CAN circuit communication check:

F-CAN circuit communication check
?1.
Reconnect the following connector.
Millimeter wave radar 8P connector

?2.
Turn the vehicle to the ON mode.

?3.
Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

  

Which result is indicated?

     
Gauge control module (Bus A) is Not Available
     
     
     
Go to step 10.
     
Millimeter wave radar (Bus B) is Not Available
     
     
     
Go to step 11.
     
Millimeter wave radar and gauge control module are Detected
     
     
     
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting.?
10.
Open wire check (F-CAN A_H, F-CAN A_L lines):

Open wire check (F-CAN A_H, F-CAN A_L lines)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
CAN gateway 12P connector
Gauge control module connector A (32P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CAN gateway 12P connector: disconnected
 
Gauge control module connector A (32P): disconnected
Test point 1
CAN gateway 12P connector (female terminals) No. 3:
Test point 2
Gauge control module connector A (32P) No. 19

Test point 1
CAN gateway 12P connector (female terminals) No. 9:
Test point 2
Gauge control module connector A (32P) No. 20


Is there continuity?

     
YES
     
     
     
Check for loose terminals in the CAN gateway 12P connector and gauge control module connector A (32P). If they are OK, substitute a known-good gauge control module, then retest. If the indicators come on then go off after substitution, replace the original gauge control module.?
     
NO
     
     
     
Repair an open in the wire between the gauge control module and the CAN gateway.?
11.
Open wire check (F-CAN B_H, F-CAN B_L lines):

Open wire check (F-CAN B_H, F-CAN B_L lines)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
CAN gateway 12P connector
Millimeter wave radar 8P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CAN gateway 12P connector: disconnected
 
Millimeter wave radar 8P connector: disconnected
Test point 1
CAN gateway 12P connector (female terminals) No. 12:
Test point 2
Millimeter wave radar 8P connector No. 7

Test point 1
CAN gateway 12P connector (female terminals) No. 5:
Test point 2
Millimeter wave radar 8P connector No. 6


Is there continuity?

     
YES
     
     
     
Check for loose terminals and poor connections in the millimeter wave radar 8P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace millimeter wave radar.?
     
NO
     
     
     
Repair an open in the wire between the millimeter wave radar and the CAN gateway.?