DTC B1075

DTC B1075  : Headlight Switch Malfunction

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

DTC (Relay Control Module)

1. Problem verification

   -1. Clear the DTCs with the HDS.

   -2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

   -3. Turn the combination light switch to the ON position.

   -4. Wait for at least 6 seconds.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   B1075 Headlight switch malfunction

   Is DTC B1075 indicated?

   YES 

   Go to step 2.

   NO 

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

2. DTC check

   -1. Check for body control module and relay control module DTCs with the HDS.

   Body Control Module 

   DTC Description	DTC
   B1275 Head light OFF position Circuit Malfunction
   B1276 Headlight Switch Parking (Small) Position Circuit Malfunction
   B1277 Head light AUTO position Circuit Malfunction
   B1278 Head light ON position Circuit Malfunction

   Relay Control Module 

   DTC Description	DTC
   B1080 Power supply circuit (IG1 line) input error for Relay Control Module and MICU

   Are any DTCs indicated?

   YES 

   Go to indicated DTCs troubleshooting.

   NO 

   Go to step 3.

3. Relay control module H/L ON SW line check 1

   -1. Turn the combination light switch to the OFF position.

   -2. Check the parameter (s) below with the HDS.

   Signal	Current conditions
   	Values	Unit
   Headlight Switch (BACK-UP)

   Is the information indicator OFF?

   YES 

   Go to step 4.

   NO 

   Go to step 6.

4. Relay control module H/L ON SW line check 2

   -1. Turn the combination light switch to the ON position.

   -2. Check the parameter (s) below with the HDS.

   Signal	Current conditions
   	Values	Unit
   Headlight Switch (BACK-UP)

   Is the information indicator ON?

   YES 

   Replace the relay control module .

   NO 

   Go to step 5.

5. Open wire check (H/L ON SW line)

   -1. Connect terminals A and B with a jumper wire.

   Terminal A	Relay control module connector C (18P) No. 10
   Terminal B	Body ground

   -2. Check the parameter (s) below with the HDS.

   Signal	Current conditions
   	Values	Unit
   Headlight Switch (BACK-UP)

   Is the information indicator ON?

   YES 

   Repair an open or high resistance in the wire.

   NO 

   Replace the relay control module .

6. Shorted wire check (H/L ON SW line)

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

   -2. Disconnect the following connectors.

   Combination light switch 12P connector Relay control module connector C (18P)

   -3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Combination light switch 12P connector: disconnected Relay control module connector C (18P): disconnected
   Test point 1	Relay control module connector C (18P) No. 10
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

   Replace the relay control module .