DTC : B1280

DTC B1280  : Turn signal switch circuit malfunction

DTC (MICU)

NOTE:  If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .

1. 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

   -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)

   -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

   Courtesy of HONDA, U.S.A., INC.

   - 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 wire and the L TURN SW wire is not shorted. Replace the Combination Light Switch - Removal and Installation .

   NO 

   Repair a short between the wires.

4. 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)

   -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 - Removal and Installation .

6. 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 - Removal and Installation .