DTC Troubleshooting: B1275, B1276, B1277, B1278DTC B1275:
Headlight OFF Position Circuit Malfunction
DTC B1276:
Combination Light Switch Parking (PARKING LIGHT) Position Circuit Malfunction
DTC B1277:
Headlight AUTO Position Circuit Malfunction
DTC B1278:
Headlight 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
Troubleshooting - B-CAN System Diagnosis Test Mode A.
1.
Clear the DTCs with the HDS.
2.
Turn the ignition switch to LOCK (0) and then back to ON (II), or press the engine start/stop button to select the OFF mode and then ON mode.
3.
Turn the combination light switch to the PARKING (SMALL), AUTO, and ON (low beam) positions for 6 seconds in each position, and then to the OFF position.
4.
Check for DTCs with the HDS.
Are DTCs B1275, B1276, B1277, and/or B1278 indicated?
YES -
Go to step 5.
NO -
Intermittent failure, the system is OK at this time. Check for loose or poor connections.�
5.
Select LIGHTING from the BODY ELECTRICAL system select menu, and enter DATA LIST.
6.
Check each combination light switch position value with the DATA LIST menu.
When the combination light switch is turned OFFWhen the combination light switch is turned to PARKING LIGHTWhen the combination light switch is turned to AUTOWhen the combination light switch is turned ON (HEADLIGHT)Are all data list values correct?
YES -
Faulty driver's MICU; replace the driver's under-dash fuse/relay box
Drivers Under-Dash Fuse/Relay Box (Drivers MICU) Removal and Installation.�
NO -
Go to step 7.
7.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8.
Disconnect the combination light switch 12P connector.
9.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
10.
Select LIGHTING from the BODY ELECTRICAL system select menu, and enter DATA LIST.
11.
Check each combination light switch position value with the DATA LIST menu.
Are all data list values indicated OFF?
YES -
Go to step 15.
NO -
Go to step 12.
12.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
13.
Disconnect driver's under-dash fuse/relay box connector R (24P).
14.
Check for continuity between body ground and driver's under-dash fuse/relay box connector R (24P) terminals No. 6,No. 7, and No. 8 individually.
Is there continuity?
YES -
Repair a short to ground in the wire.�
NO -
Faulty driver's MICU; replace the driver's under-dash fuse/relay box
Drivers Under-Dash Fuse/Relay Box (Drivers MICU) Removal and Installation.�
15.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
16.
Do the combination light switch test
Service and Repair.
Is the combination light switch OK?
YES -
Go to step 17.
NO -
Replace the combination light switch.�
17.
Disconnect driver's under-dash fuse/relay box connector R (24P).
18.
Check for continuity between driver's under-dash fuse/relay box connector R (24P) terminals and the combination light switch 12P connector terminals as shown:
Is there continuity?
YES -
Go to step 19.
NO -
Repair open in the wire.�
19.
Check for continuity between driver's under-dash fuse/relay box connector R (24P) terminals as shown:
Is there continuity?
YES -
Repair a short between the wires.�
NO -
Faulty driver's MICU; replace the driver's under-dash fuse/relay box
Drivers Under-Dash Fuse/Relay Box (Drivers MICU) Removal and Installation.�
