Acura TSX / Honda Accord CL. Manual - part 21

Fig. 11: Checking For Continuity Between The No. 6 Terminal Of The Relay Control Module 
10P Connector I & Body Ground 

DTC B1078: DAYTIME RUNNING LIGHTS SIGNAL ERROR 

1. Clear the DTCs using the HDS.  

2. Cycle the ignition switch to OFF and then back ON.  

3. Operate the parking brake lever.  

4. Check for DTCs using the HDS. 

Is DTC B1078 indicated? 

YES: Go to step 5.  

NO: Intermittent failure, the daytime running lights system is OK at this time. Check pin fits 
and connections.  

5. Turn the headlight switch ON, then push the combination light switch forward for high beams. 

Do both headlights come on? 

YES: Go to step 6.  

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Exterior Lights - TSX

  

 

NO: Go to step 9 .  

6. Turn the headlight switch OFF.  

7. Select LIGHTING SYSTEM from the HDS, and enter the DATA LIST.  

8. Check the ON/OFF information of the DRL Relay Command (Canada) in the DATA LIST. 

Is the information indicator ON? 

YES: Replace the daytime running lights relay.  

NO: Go to the relay control module input test (see RELAY CONTROL MODULE INPUT 
TEST ).  

9. Check the No. 3 (10A) or No. 5 (10A) fuses in the under-hood fuse/relay box. 

Are both fuses OK? 

YES: Go to step 10.  

NO: Replace the blown fuse and recheck the system.  

10. Check headlight bulbs. 

Are both bulbs OK? 

YES: Go to step 11.  

NO: Replace the blown bulb and recheck the system.  

11. Check for continuity between the No. 3 terminal of the headlight (high beam) 3P connectors and the No. 

8 (left headlight) or No. 10 (right headlight) terminals of the under-hood fuse/relay box 14P connector H. 

Is there continuity? 

YES: Go to step 12.  

NO: Repair an open in the WHT/YEL (left headlight) or WHT/GRN (right headlight) wire. 

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Exterior Lights - TSX

  

 

Fig. 12: Checking For Continuity Between The Headlight Connectors & The Under-Hood 
Fuse/Relay Box 14P Connector H 

12. Check for continuity between the No. 2 terminal of the headlight (high beam) 3P connectors and body 

ground. 

Is there continuity? 

YES: Faulty relay control module; replace the under-hood fuse/relay box.  

NO: Check the daytime running lights relay (left headlight). If OK, repair an open in the 
BLK wire or poor ground (G201, G301). 

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Exterior Lights - TSX

  

 

Fig. 13: Checking For Continuity Between The No. 2 Terminal Of The Headlight (High 
Beam) 3P Connectors & Body Ground 

DTC B1275: HEADLIGHT SWITCH OFF POSITION CIRCUIT MALFUNCTION; DTC B1276: 
HEADLIGHT SWITCH PARKING (SMALL) POSITION CIRCUIT MALFUNCTION; DTC B1277: 
HEADLIGHT SWITCH AUTO POSITION CIRCUIT MALFUNCTION; DTC B1278: HEADLIGHT 
SWITCH ON POSITION CIRCUIT MALFUNCTION 

1. Clear the DTCs using the HDS.  

2. Cycle the ignition switch to OFF and then back ON.  

3. Check for DTCs using the HDS. 

Is DTC B1275, B1276, B1277 or B1278 indicated? 

YES: Go to step 4.  

NO: Intermittent failure, the headlight system is OK at this time. Check pin fits and 

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Exterior Lights - TSX