Acura TSX / Honda Accord CL. Manual — part 22

connections.

4. Reset the DTCs using the HDS.

5. Turn the ignition switch ON (II) and wait for 2 seconds.

6. Turn the parking (small) light switch ON and wait for 2 seconds.

7. Turn the headlight light switch (LOW) ON and wait for 2 seconds.

8. Change the dimmer switch position from low beam to high beam and wait for 2 seconds.

9. Check the DTCs using the HDS.

Is DTC B1275, B1276, B1277 or B1278 indicated?

YES: Go to step 10.

NO: Intermittent failure, the combination switch and the control unit are OK at this time.
Check pin fits and connections.

10. Disconnect the combination light switch 12P connector from the wiper/washer switch.

11. Perform the combination light switch test (see COMBINATION LIGHT SWITCH

TEST/REPLACEMENT ).

Is the combination light switch check OK?

YES: Faulty combination switch control unit, replace the wiper/washer switch.

NO: Replace the combination light switch.

DTC B1279: HEADLIGHT SWITCH DIMMER 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 B1279 indicated?

YES: Go to step 4.

NO: Intermittent failure. The turn signal switch circuit is OK at this time. Check pin fits and
connections.

4. Reset the DTCs by CLEAR MENU (DTC CLEAR) of the HDS.

5. Turn the ignition switch ON (II), then turn the headlight switch ON.

6. Change the combination light switch from low beam to high beam and wait for 2 seconds.

7. Pull and hold the combination light switch lever and keep the passing switch position for more than 2

seconds.

8. Check for DTCs by selecting the DTCs MENU (DTCs) from the HDS.

Is DTC B1279 indicated?

YES: Go to step 9.

NO: Intermittent failure, the combination switch and the combination switch control unit are
OK at this time. Check pin fits and connections.

9. Disconnect the combination light switch 12P connector from the wiper/washer switch.

10. Perform the combination light switch test (see COMBINATION LIGHT SWITCH

TEST/REPLACEMENT ).

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Exterior Lights - TSX

Is the combination light switch OK?

YES: Faulty combination switch control unit, replace the wiper/washer switch.

NO: Replace the combination light switch.

DTC B1280: TURN SIGNAL SWITCH 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 B1280 indicated?

YES: Go to step 4.

NO: Intermittent failure. The turn signal switch circuit is OK at this time. Check pin fits and
connections.

4. Reset the DTCs by CLEAR MENU (DTC CLEAR) of the HDS.

5. Turn the ignition switch ON (II).

6. Turn the turn signal switch to the left position and wait for 2 seconds.

7. Turn the turn signal switch to the right position and wait for 2 seconds.

8. Check for DTCs using the HDS.

Is DTC B1280 indicated?

YES: Go to step 9.

NO: Intermittent failure, the turn signal light switch and the combination switch control unit
are OK at this time. Check pin fits and connections.

9. Disconnect the combination light switch 12P connector from the wiper/washer switch.

10. Check for short in the turn signal light switch terminals in each switch position (see COMBINATION

LIGHT SWITCH TEST/REPLACEMENT ).

Is there a short?

YES: Faulty, turn signal light switch, replace the combination light switch.

NO: Faulty combination switch control unit, replace the wiper/washer switch.

HID LAMP SYSTEM TROUBLESHOOTING

1. Check the No. 1 (15A) and No. 6 (15A) fuses in the under-hood fuse/relay box.

Are the fuses OK?

YES: Go to step 2.

NO: Replace the fuse(s), and recheck.

2. Substitute a known-good HID bulb and recheck.

CAUTION: Never turn on the combination light switch before fitting the HID bulbs to

their bulb sockets and completing the reassembly of the headlight
assembly.

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Exterior Lights - TSX

Does the headlight low beam come on?

YES: Replace the original HID bulb.

NO: Go to step 3.

3. Disconnect the 2P connector from the inverter unit.

4. Turn the combination light switch ON.

5. Measure voltage between the No. 2 terminal of the inverter unit 2P connector and body ground.

Is there battery voltage?

YES: Go to step 6.

NO: Repair open in the wire between the under-hood fuse/relay box and the inverter unit.

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Exterior Lights - TSX

Fig. 14: Measuring Voltage Between The No. 2 Terminal Of The Inverter Unit 2P Connector
& Body Ground

6. Turn the combination light switch OFF.

7. Check for continuity between the No. 1 terminal of the inverter unit 2P connector and body ground.

Is there continuity?

YES: Substitute a known-good inverter, and recheck. If the symptom/indication goes away,
replace the original inverter unit.

NO: Repair open in the wire between the inverter unit and body ground. If the wire is OK,

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Exterior Lights - TSX