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Taillight Circuit








LIGHTING: LIGHTING SYSTEM: Taillight Circuit

Taillight Circuit

DESCRIPTION

When the light control switch, located on the headlight dimmer switch, is turned to the TAIL position, the front position lights, front marker lights, rear taillights and license plate light(s) illuminate.

WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

1. CHECK WHETHER LIGHTS ILLUMINATE
(a) Check whether the following lights illuminate: Front position lights, Rear taillights and License plate light.
Result:






E -- INSPECT BULB (LICENSE PLATE LIGHT BULB)
D -- INSPECT BULB (REAR TAILLIGHT BULB)
C -- INSPECT BULB (FRONT MARKER LIGHT)
B -- INSPECT BULB (FRONT POSITION LIGHT BULB)
A -- Continue to next step.
2. INSPECT FUSE (TAIL)
(a) Remove the TAIL fuse from the main body ECU.
(b) Measure the resistance.
Standard resistance:
Below 1 Ohms
(c) Reconnect the TAIL fuse.
NG -- REPLACE FUSE
OK -- Continue to next step.
3. PERFORM ACTIVE TEST USING TECHSTREAM (TAIL LIGHT)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester on.
(d) Enter the following menus: Body Electrical / Main Body / Active Test / Taillight Relay.
(e) Check the taillights while operating the taillight relay using the tester.
Main Body (Main Body ECU):






OK:
The taillights come on when operated through the Techstream.
NG -- PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE
OK -- Continue to next step.
4. INSPECT HEADLIGHT DIMMER SWITCH




(a) Remove the headlight dimmer switch.
(b) Inspect the light control switch.
(c) Measure the resistance.
Standard resistance:





(d) Reinstall the headlight dimmer switch.
NG -- REPLACE HEADLIGHT DIMMER SWITCH
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT DIMMER SWITCH)




(a) Disconnect the D4 headlight dimmer switch connector.
(b) Measure the voltage.
Standard voltage:





(c) Reconnect the headlight dimmer switch connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT DIMMER SWITCH - BODY GROUND)
6. INSPECT BULB (FRONT POSITION LIGHT BULB)
(a) Hatchback:





(1) Remove the front position light.
(2) Apply battery voltage to the terminals and check that the front position light illuminates.
Standard:






(3) Reinstall the front position light.
(b) Sedan:





(1) Remove the front position light.
(2) Apply battery voltage to the terminals and check that the front position light illuminates.
Standard:






(3) Reinstall the front position light.
NG -- REPLACE BULB
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT POSITION LIGHT)
(a) Hatchback:





(1) Disconnect the B3 and B4 front position light connectors.
(2) Disconnect the 4B main body ECU connector.
(3) Measure the resistance.
Standard resistance:






(4) Reconnect the front position light connectors.
(5) Reconnect the main body ECU connector.
(b) Sedan:





(1) Disconnect the B14 and B15 front position light connectors.
(2) Disconnect the 4B main body ECU connector.
(3) Measure the resistance.
Standard resistance:






(4) Reconnect the front position light connectors.
(5) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT POSITION LIGHT - BODY GROUND)
8. INSPECT BULB (FRONT MARKER LIGHT)
(a) Hatchback:





(1) Remove the front marker light.
(2) Apply battery voltage to the terminals and check that the front marker light illuminates.
Standard:






(3) Reinstall the front marker light.
(b) Sedan:





(1) Remove the front marker light.
(2) Apply battery voltage to the terminals and check that the front marker light illuminates.
Standard:






(3) Reinstall the front marker light.
NG -- REPLACE BULB
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT MARKER LIGHT)
(a) Hatchback:





(1) Disconnect the B11 and B12 front marker light connectors.
(2) Disconnect the 4B main body ECU connector.
(3) Measure the resistance.
Standard resistance:






(4) Reconnect the front marker light connectors.
(5) Reconnect the main body ECU connector.
(b) Sedan:





(1) Disconnect the B14 and B15 front marker light connectors.
(2) Disconnect the 4B main body ECU connector.
(3) Measure the resistance.
Standard resistance:






(4) Reconnect the front marker light connectors.
(5) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT MARKER LIGHT - BODY GROUND)
10. INSPECT BULB (REAR TAILLIGHT BULB)
(a) Hatchback:





(1) Remove the rear combination light assembly.
(2) Apply battery voltage to the terminals and check that the rear taillight illuminates.
Standard:






(3) Reinstall the rear combination light assembly.
(b) Sedan:





(1) Remove the rear combination light assembly.
(2) Apply battery voltage to the terminals and check that the rear taillight illuminates.
Standard:






(3) Reinstall the rear combination light assembly.
NG -- REPLACE BULB
OK -- Continue to next step.
11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - REAR TAILLIGHT)
(a) Hatchback:





(1) Disconnect the J3 and J4 rear combination light assembly connectors.
(2) Disconnect the 4A main body ECU connector.
(3) Measure the resistance.
Standard resistance:






(4) Reconnect the rear combination light assembly connectors.
(5) Reconnect the main body ECU connector.
(b) Sedan:





(1) Disconnect the J34 and J35 rear combination light assembly connectors.
(2) Disconnect the 4A main body ECU connector.
(3) Measure the resistance.
Standard resistance:






(4) Reconnect the rear combination light assembly connectors.
(5) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (REAR TAILLIGHT - BODY GROUND)
12. INSPECT BULB (LICENSE PLATE LIGHT BULB)
(a) Hatchback:





(1) Remove the license plate light assembly.
(2) Apply battery voltage to the terminals and check that the license plate light illuminates.
Standard:






(3) Reinstall the license plate light assembly.
(b) Sedan:





(1) Remove the license plate light assembly.
(2) Apply battery voltage to the terminals and check that the license plate light illuminates.
Standard:






(3) Reinstall the license plate light assembly.
NG -- REPLACE BULB
OK -- Continue to next step.
13. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - LICENSE PLATE LIGHT ASSEMBLY)
(a) Hatchback:





(1) Disconnect the L1 license plate light assembly connector.
(2) Disconnect the 4A main body ECU connector.
(3) Measure the resistance.
Standard resistance:






(4) Reconnect the license plate light assembly connector.
(5) Reconnect the main body ECU connector.
(b) Sedan:





(1) Disconnect the J36 and J37 license plate light assembly connectors.
(2) Disconnect the 4A main body ECU connector.
(3) Measure the resistance.
Standard resistance:






(4) Reconnect the license plate light assembly connectors.
(5) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY - BODY GROUND)
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