Exterior Light System Acura TSX I

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Circuit Diagram

USA models

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Canada models

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Circuit Diagram - Fog Lights

'06-08 models

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1. Clear the DTCs using the HDS.
2. Turn the headlights switch from the OFF position to the ON position.
3. Check for DTCs using the HDS. Is DTC B1075 indicated? YES - Go to step 4. NO - Intermittent failure, the headlight circuit is OK at this time. Check pinfits and connections.
4. With the headlight switch OFF, select LIGHTING SYSTEM from the HDS, and enter the DATA LIST.
5. Check the ON/OFF information of the Headlight Switch (BACK-UP) in the DATA LIST. Is the Information indicator OFF? YES - Go to step 6. NO - Go to step 10 .
6. Turn the headlight switch ON.
7. Check the ON/OFF information of the Headlight Switch (BACK-UP) in the DATA LIST. Is the information indicator ON? YES - Troubleshoot DTC B1278. NO - Go to step 8.
8. Disconnect under-hood fuse/relay box 10P connector K and the wiper/washer switch 8P connector.
9. Check for continuity between the No. 6 terminal of under-hood fuse/relay box 10P connector K and the No. 1 terminal of the wiper/washer switch (combination switch control unit) 8P connector. Is there continuity? YES - Faulty combination switch control unit-replace the wiper/washer switch. NO - Repair an open in the WHT wire.
10. Disconnect under-hood fuse/relay box 10P connector K.
11. Check for continuity between the No.6 terminal of under-hood fuse/relay box 10P connector K and body ground. Is there continuity? YES - Repair a short in the WHT wire. NO - Faulty combination switch control unit; replace the wiper/washer switch.

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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 pinfits 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. 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 models) 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»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) ).
9. Check the No. 3 (10 A) or No. 5 (10 A) 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 the 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 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.
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 and RED/BLK wire or poor ground (G201, G301).

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 pinfits and 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, B1278 also indicated? YES - Go to step 10. NO - Intermittent failure, the combination switch and the control unit are OK at this time. Check pinfits 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»(/acura/tsx/i-2003-2008/remont/exterior-lights/#exterior-light-system) ). 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 pinfits 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 pinfits 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»(/acura/tsx/i-2003-2008/remont/exterior-lights/#exterior-light-system) ). 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 pinfits 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 pinfits 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»(/acura/tsx/i-2003-2008/remont/exterior-lights/#exterior-light-system) ). 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

Special Tools Required

HID bulb test light 07AAJ-S3MA100

Note. Before troubleshooting the HID Lamp System, perform the multiplex integrated control system troubleshooting using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

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1. Check the No. 1 (15 A) and No. 6(15 A) 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. Make sure you have the anti-theft codes for the audio system and the navigation system (if equipped), then write down the audio presets.
3. Turn the combination light switch OFF.
4. Disconnect the negative battery cable, then disconnect the positive cable.
5. Remove the bulb socket from the HID bulb (see «HID BULB REPLACEMENT»(/acura/tsx/i-2003-2008/remont/exterior-lights/#exterior-light-system__hid-bulb-replacement) ).
6. Check for corrosion (A) and traces of electrical arcing (B) at the socket mating part. Is the socket corroded or burnt? YES - Go to step 7. NO - Replace the socket, and recheck.
7. Connect the HID bulb test light (A) to the socket (B).
8. Reconnect the battery negative cable.
9. Turn the combination light (headlight) switch ON. Does the bulb in the test light come on? YES - Replace the original HID bulb (see «HID BULB REPLACEMENT»(/acura/tsx/i-2003-2008/remont/exterior-lights/#exterior-light-system__hid-bulb-replacement) ). NO - Go to step 10.
10. Turn the combination light (headlight) switch OFF.
11. Disconnect the battery negative cable.
12. Remove the HID bulb test light from the bulb socket.
13. Reconnect the battery negative cable.
14. Disconnect the HID unit 2P connector.
15. Turn the combination light (headlight) switch ON.
16. Check for continuity between the HID unit 2P connector No. 1 terminal and body ground. Is there continuity? YES - Go to step 17. NO - Repair an open in the wire between the HID unit and body ground. If the wire is OK, check for poor ground at G201 or G301. NOTE: Enter the anti-theft codes for the audio system and the navigation system (if equipped), then enter the audio presets. Set the clock (on vehicles without navigation).
17. Measure the voltage between the HID unit 2P connector No. 2 terminal and body ground. Is there battery voltage? YES - Substitute a known-good HID unit, and recheck. If the symptom/indication goes away, replace the original HID unit. NO - Go to step 18.
18. Disconnect under-hood fuse/relay box connector H (14P).
19. Check for continuity between under-hood fuse/ relay box connector H (14P) No. 7 (No. 12) terminal and the HID unit 2P connector No. 2 terminal. Is there continuity? YES - Replace the under-hood fuse/relay box. NO - Repair an open in the wire between the under-hood fuse/relay box and the HID unit.

HID Bulb Replacement

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1. Make sure you have the anti-theft code for the audio system and the navigation system (if equipped), then write down the audio presets.
2. Turn the combination light switch OFF.
3. Disconnect the battery negative cable, then disconnect the positive cable.
4. Remove the battery.
5. Remove the Torx bolt using a tamper-proof Torx T20 bit.
6. Turn the cover (A) 45° counterclockwise to remove it from the headlight assembly.
7. Turn the socket (A) 45° counterclockwise to remove it from the bulb (B).
8. Pull the retaining spring (C) away from the bulb then remove the bulb. Headlight (low beam): 35 W
9. Install the new bulb in the reverse order of removal, make sure the notches in the bulb align with the tabs in the headlight.
10. After reconnecting the battery, enter the anti-theft codes for the audio system and the navigation system (if equipped), then enter the audio presets. Set the clock (on vehicle without navigation).

Scheme 22

1. Make sure you have the anti-theft codes for the audio system and the navigation system (if equipped), then write down the audio presets.
2. Turn the combination light switch OFF.
3. Disconnect the battery negative cable, then disconnect the positive cable.
4. Remove the headlight assembly (see «HEADLIGHT REPLACEMENT»(/acura/tsx/i-2003-2008/remont/exterior-lights/#exterior-light-system) ).
5. Remove the bulb socket from the HID bulb (see «HID BULB REPLACEMENT»(/acura/tsx/i-2003-2008/remont/exterior-lights/#exterior-light-system__hid-bulb-replacement) ).
6. Remove the three mounting screws and the HID unit.
7. Install in the reverse order of removal.
8. Enter the anti-theft codes for the audio system and the navigation system (if equipped), then enter the audio presents. Set the clock (on vehicles without navigation).

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1. Disconnect the 3P connector (A) from the headlight. Headlight (high beam): 55 W
2. Remove the rubber cover (B).
3. Pull the retaining spring (C) away from the bulb (D), then remove the bulb.
4. Install a new bulb in the reverse order of removal. Make sure the notches in the bulb align with the tabs in the headlight.

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1. Disconnect the 2P connector (A) from the light. Front Parking/Side marker Light: 3 CP Front Turn Signal Light: 21 W
2. Turn the bulb socket (B) 45° counterclockwise to remove it from the headlight housing.
3. Install a new bulb in the reverse order of removal.

Headlight Adjustment

Before adjusting the headlights

1. Park the vehicle on a level surface.
2. Make sure the tire pressures are correct.
3. Have the driver or someone who weights the same sit in the driver's seat.

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1. Clean the outer lens so that you can see the center of the headlights.
2. Park the vehicle 25 ft (7.5 m) away from a wall or a screen (A).
3. Turn the low beams on.
4. Determine if the headlights are aimed properly. Vertical adjustment: Measure the height of the headlights (A). Adjust the cut line (B) to the lights height.
5. If necessary, open the hood and adjust the headlights to local requirements by turning the vertical adjuster.

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1. Remove the front bumper (see «FRONT BUMPER REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/exterior-body-panels/#bumper-system) ).
2. Remove the connectors (A) from the headlight assembly (B).
3. Remove the four mounting bolts and the harness clip, then remove the headlight.
4. Remove the bolt and the corner upper beam (C) from the headlight.
5. Install the headlight in the reverse order of removal.
6. After replacement, adjust the headlights to local requirement.

License Plate Light Replacement

Note. Be careful not to damage the bumper.

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1. Open the trunk lid.
2. Push the retaining spring (A), then remove the light. License Plate Light: 3 CP
3. Disconnect the 2P connector (B) from the light.

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1. Remove the front bumper (see «FRONT BUMPER REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/exterior-body-panels/#bumper-system) ).
2. Remove the screw (A), and release all of the hooks (B) then remove the front fog light cover (C).
3. Disconnect the 2P connector (A) from the front fog light (B).
4. Remove the screws, and remove the fog light.
5. Turn the bulb socket (A) 45° counterclockwise to remove it from the housing. Fog Light: 55 W

Fog Light Adjustment

Before adjusting the fog lights.

1. Park the vehicle on a level surface.
2. Make sure the tire pressures are correct.
3. The driver or someone who weights the same should sit in the driver's seat.

Adjust the fog lights to local requirements by turning the adjuster (A).

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1. Remove the rear bumper (see «REAR BUMPER REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/exterior-body-panels/#bumper-system__rear-bumper-removalinstallation) ).
2. Open the trunk lid and remove the trunk side trim panel (see «TRIM REMOVAL/INSTALLATION - TRUNK AREA»(/acura/tsx/i-2003-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-trunk-area) ).
3. Disconnect the connectors (A) from the taillight (B). Brake/Taillight: 21/5 W Turn Signal Light: 21 W Side Marker Light: 3 CP
4. Remove the mounting nuts and screws, then remove the taillight.
5. Turn the bulb socket 45° counterclockwise to remove the bulb.
6. Inspect the gasket; replace it if it is distorted or stays compressed.
7. Install the taillight and tighten the nuts to 5 N.m (0.5 kgf.m, 4 lbf.ft).
8. After installing the taillight, run water over it to make sure it does not leak.

Scheme 36

1. Open the trunk lid and disconnect the connectors (A) from the trunk lid. Taillight: 3 CP Back-up Light: 21 W
2. Remove the three nuts and the inner taillight (B).
3. Turn the bulb socket 45° counterclockwise to remove the bulb.
4. Inspect the gasket; replace it if it is distorted or stays compressed.
5. Install the taillight and tighten the nuts to 5 N.m (0.5 kgf.m, 4 lbf.ft).
6. After installing the taillight, run water over it to make sure it does not leak.

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1. Open the trunk lid and disconnect the 2P connector (A) from the bulb socket (B). High Mount Brake Light: 21 W
2. Turn the bulb socket (B) 45° counterclockwise to remove the bulb.

Scheme 38

1. Remove the rear shelf (see «TRIM REMOVAL/INSTALLATION - REAR SHELF AREA»(/acura/tsx/i-2003-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-rear-shelf-area) ).
2. Remove the high mount brake light housing (A) from the cover (B).

Scheme 39

1. Disconnect the 4P connector (A) from the brake pedal position switch (B).
2. Check for continuity between the No. 1 and No. 2 terminals. There should be continuity when the brake pedal is pressed. There should be no continuity when the brake pedal is released.
3. Check for continuity between the No. 3 and No. 4 terminals. There should be no continuity when the brake pedal is pressed. There should be continuity when the brake pedal is released.
4. If necessary, adjust or replace the switch, or adjust the pedal height (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/tsx/i-2003-2008/remont/mechanical-hydraulic/#conventional-brake-components) ).

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1. Remove the power mirror actuator (see «POWER MIRROR ACTUATOR REPLACEMENT»(/acura/tsx/i-2003-2008/remont/mirrors/#power-mirrors) ).
2. Disconnect 2P connector (A) from the side turn signal light (B).
3. Install in the reverse order of removal.

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1. Remove the dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/exteriorinterior-trim/#dashboard) ).
2. Remove the steering column covers (see «STEERING COLUMN REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/manual-power-steering/#power-steering-system__steering-column-removal-and-installation) ).
3. Disconnect the 12P connector (A) from the wiper/washer switch (B).
4. Remove the two screws, then slide out the combination light switch (A).
5. Inspect the connector terminals to be sure they are all making good contact. If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system. If the terminals look OK, check for continuity between the terminals in each switch position according to the tables. If the continuity is not as specified, replace the switch. Light switch: Turn signal switch: Fog light switch

See also:
• RELAY CONTROL MODULE INPUT TEST
• TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A
• FRONT BUMPER REMOVAL/INSTALLATION
• REAR BUMPER REMOVAL/INSTALLATION
• TRIM REMOVAL/INSTALLATION - TRUNK AREA
• TRIM REMOVAL/INSTALLATION - REAR SHELF AREA
• BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT
• POWER MIRROR ACTUATOR REPLACEMENT
• DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION
• STEERING COLUMN REMOVAL AND INSTALLATION
• COMBINATION LIGHT SWITCH TEST/REPLACEMENT
• HID BULB REPLACEMENT