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 - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC ChecksBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not CommunicatingBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFFBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode D - No DTCs and Output Won't Turn ON .

• 1. Turn signal/hazard warning lights system check 1:

  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 to L TURN SW wire is OK. Replace the combination light switch .

  NO 

  Repair a short between the wires.

• 4. Turn signal/hazard warning lights system check 2:

  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 6.

  NO 

  Go to step 5.

• 5. 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 .

• 6. 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 .