DTC Troubleshooting: B1075
DTC B1075: Headlight switch malfunction
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.

DTC Description
DTC
B1075 Headlight switch malfunction
  

1.
Problem verification:

Problem verification
?1.
Clear the DTCs with the HDS.


?2.
Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

?3.
Turn the headlight switch ON position.

?4.
Wait for at least 6 seconds.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
B1075 Headlight Switch Malfunction
  

Is DTC B1075 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
2.
DTC check:

DTC check
?1.
Check for body control module and relay control module DTCs with the HDS.
Body Control Module
DTC Description
DTC
B1275 Head light OFF position Circuit Malfunction
  
B1276 Head light switch parking (small) position Circuit Malfunction
  
B1277 Head light AUTO position Circuit Malfunction
  
B1278 Head light ON position Circuit Malfunction
  

Relay Control Module
DTC Description
DTC
B1080 Power supply circuit (IG1 line) input error for Relay Control Module and MICU
  

Are any DTCs indicated?

     
YES
     
     
     
Go to indicated DTCs troubleshooting.?
     
NO
     
     
     
Go to step 3.
3.
Relay control module H/L ON SW line check 1:

Relay control module H/L ON SW line check 1
?1.
Turn the combination light switch OFF position.

?2.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
Headlight Switch (BACK-UP)
    

Is the information indicator OFF?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Go to step 6.
4.
Relay control module H/L ON SW line check 2:

Relay control module H/L ON SW line check 2
?1.
Turn the combination light switch ON position.

?2.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
Headlight Switch (BACK-UP)
    

Is the information indicator ON?

     
YES
     
     
     
     
NO
     
     
     
Go to step 5.
5.
Open wire check (H/L ON SW line):

Open wire check (H/L ON SW line)
?1.
Connect terminals A and B with a jumper wire.
Terminal A
Relay control module connector C (18P) No. 10
Terminal B
Body ground

?2.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
Headlight Switch (BACK-UP)
    

Is the information indicator ON?

     
YES
     
     
     
Repair an open or high resistance in the wire.?
     
NO
     
     
     
6.
Shorted wire check (H/L ON SW line):

Shorted wire check (H/L ON SW line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
Combination light switch 12P connector
Relay control module connector C (18P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Combination light switch 12P connector: disconnected
Relay control module connector C (18P): disconnected
Test point 1
Relay control module connector C (18P) No. 10
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO