DTC Troubleshooting: B1280
DTC B1280: Turn Signal Switch Circuit 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
B1280 Turn Signal Switch Circuit Malfunction
  

1.
Turn signal/hazard warning lights system check:

Turn signal/hazard warning lights system check
?1.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
Turn Signal Switch (LEFT)
OFF
      
Turn Signal Switch (RIGHT)
OFF
      

Are both data list values indicated OFF?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Go to step 4.
2.
Turn signal/hazard warning lights system check 2:

Turn signal/hazard warning lights system check 2
?1.
Operate the turn signal switch to the left or right position.

?2.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
Turn Signal Switch (LEFT)
ON
      
Turn Signal Switch (RIGHT)
ON
      

Are both data list values indicated ON?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Intermittent failure, the system is OK at this time.?
3.
Shorted wire check (R TURN SW to L TURN SW line):

Shorted wire check (R TURN SW to L TURN SW line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Combination light switch 12P connector

?3.
Connect terminals A and B with a jumper wire.
Terminal A
Combination light switch 12P connector No. 10
Terminal B
Body ground


?4.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
Turn Signal Switch (LEFT)
OFF
      
Turn Signal Switch (RIGHT)
ON
      

Are both data list values correct?

     
YES
     
     
     
The R TURN SW and the L TURN SW wires are not shorted. Replace the combination light switch.?
     
NO
     
     
     
Repair a short between the wires.?
4.
Shorted wire check (L TURN SW line or R TURN SW line):

Shorted wire check (L TURN SW line or R TURN SW line)
?1.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
Turn Signal Switch (LEFT)
ON
      
Turn Signal Switch (RIGHT)
OFF
      

Is TURN SIGNAL SWITCH (LEFT) value ON?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Go to step 6.
5.
Shorted wire check (L TURN SW line):

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

?2.
Disconnect the following connector.
Combination light switch 12P connector

?3.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
Turn Signal Switch (LEFT)
ON
      

Is TURN SIGNAL SWITCH (LEFT) value ON?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO
     
     
     
The L TURN SW wire is OK. Replace the combination light switch.?
6.
Shorted wire check (R TURN SW line):

Shorted wire check (R TURN SW line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Combination light switch 12P connector

?3.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
Turn Signal Switch (RIGHT)
ON
      

Is TURN SIGNAL SWITCH (RIGHT) value ON?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO
     
     
     
The R TURN SW wire is OK. Replace the combination light switch.?