DTC B1275, B1276, B1277, B1278

DTC B1275  : Head light OFF position Circuit Malfunction

DTC B1276  : Headlight Switch Parking (Small) Position Circuit Malfunction

DTC B1277  : Head light AUTO position Circuit Malfunction

DTC B1278  : Head light ON position Circuit Malfunction

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

DTC (Body Control Module)

1. Problem verification

   -1. Check the parameter(s) below with the HDS.

   When the combination light switch is turned OFF 

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Headlight Switch (OFF)	ON
   Headlight Switch (PARKING)	OFF
   Headlight Switch (AUTO)	OFF
   Headlight Switch (HEADLIGHT)	OFF

   When the combination light switch is turned to PARKING 

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Headlight Switch (OFF)	OFF
   Headlight Switch (PARKING)	ON
   Headlight Switch (AUTO)	OFF
   Headlight Switch (HEADLIGHT)	OFF

   When the combination light switch is turned to AUTO 

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Headlight Switch (OFF)	OFF
   Headlight Switch (PARKING)	OFF
   Headlight Switch (AUTO)	ON
   Headlight Switch (HEADLIGHT)	OFF

   When the combination light switch is turned ON (HEADLIGHT) 

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Headlight Switch (OFF)	OFF
   Headlight Switch (PARKING)	ON
   Headlight Switch (AUTO)	OFF
   Headlight Switch (HEADLIGHT)	ON

   Are all data list values correct?

   YES 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

   NO 

   Go to step 2.

2. Exterior lights system check

   -1. Check the parameter(s) below with the HDS.

   Cycle through all switch selections 

   Signal	Current conditions
   	Values	Unit
   Headlight Switch (OFF)
   Headlight Switch (PARKING)
   Headlight Switch (AUTO)
   Headlight Switch (HEADLIGHT)

   Is any data list value OFF, not ON?

   YES 

   Go to step 5.

   NO 

   Go to step 3.

3. Determine possible failure area (combination light switch, others)

   -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	Current conditions
   	Values	Unit
   Headlight Switch (OFF)
   Headlight Switch (PARKING)
   Headlight Switch (AUTO)
   Headlight Switch (HEADLIGHT)

   Are all data lists values OFF?

   YES 

   Replace the combination light switch .

   NO 

   Go to step 4.

4. Shorted wire check (H/L_OFF_SW, H/L_ON_SW, PARKING_LT_SW lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   Body control module connector C (28P)

   -3. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Combination light switch 12P connector: disconnected Body control module connector C (28P): disconnected
   Test point 1	Body control module connector C (28P) No. 10
   Test point 2	Body ground

   Test point 1	Body control module connector C (28P) No. 9
   Test point 2	Body ground

   Test point 1	Body control module connector C (28P) No. 11
   Test point 2	Body ground

   Is there 1.0 MΩ or more?

   YES 

   The H/L_OFF_SW, H/L_ON_SW, and PARKING_LT_SW wires are OK. Replace the body control module .

   NO 

   Repair a short to ground in the wire.

5. Determine possible failure area (combination light switch, others)

   -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 jumper wires.

   Terminal A	Combination light switch 12P connector (female terminals) No. 1:
   Terminal B	Body ground

   Terminal A	Combination light switch 12P connector (female terminals) No. 7:
   Terminal B	Body ground

   Terminal A	Combination light switch 12P connector (female terminals) No. 8:
   Terminal B	Body ground

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

   -4. Check the parameter(s) below with the HDS.

   Signal	Current conditions
   	Values	Unit
   Headlight Switch (OFF)
   Headlight Switch (PARKING)
   Headlight Switch (AUTO)
   Headlight Switch (HEADLIGHT)

   Has the data list value changed from OFF to ON?

   YES 

   Replace the combination light switch .

   NO 

   Go to step 6.

6. Open wire check (H/L_OFF_SW, H/L_ON_SW, PARKING_LT_SW, COMBI_SW_GND(LT) lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   Body control module connector C (28P)

   -3. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Body control module connector C (28P): disconnected Combination light switch 12P connector: disconnected
   Test point 1	Body control module connector C (28P) No. 10
   Test point 2	Combination light switch 12P connector (female terminals) No. 1:

   Test point 1	Body control module connector C (28P) No. 9
   Test point 2	Combination light switch 12P connector (female terminals) No. 7:

   Test point 1	Body control module connector C (28P) No. 11
   Test point 2	Combination light switch 12P connector (female terminals) No. 8:

   Test point 1	Body control module connector C (28P) No. 3
   Test point 2	Combination light switch 12P connector (female terminals) No. 6:

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

   Is there 1.0 Ω or less?

   YES 

   The H/L_OFF_SW, H/L_ON_SW, PARKING_LT_SW, and COMBI_SW_GND(LT) wires are OK. Replace the body control module .

   NO 

   Repair an open or high resistance in the wire.