Taillight Relay Circuit

LIGHTING: LIGHTING SYSTEM: Taillight Relay Circuit
- Taillight Relay Circuit

DESCRIPTION

The headlight dimmer switch sends a signal to the main body ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. 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 / Body / Active Test / Tail Light

(e) Check the taillights while operating the taillight relay using the tester.

Body (Main Body ECU):





OK:

The taillights come on when operating it through the Techstream.

Result:





E -- INSPECT BULB (OUTER REAR VIEW MIRROR ILLUMINATION LIGHT)

D -- INSPECT BULB (TAILLIGHT)

C -- INSPECT BULB (FRONT TURN SIGNAL LIGHT)

B -- INSPECT FUSE (TAIL FUSE)

A -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

2. INSPECT FUSE (TAIL FUSE)

(a) Remove the TAIL fuse from the main body ECU.

(b) Measure the resistance according value(s) in the table below.

Standard resistance:





(c) Reinstall the TAIL fuse.

NG -- REPLACE FUSE
OK -- Continue to next step.

3. INSPECT TAIL RELAY

(a) Remove the TAIL relay from the main body ECU.





(b) Measure the resistance according value(s) in the table below.

Standard resistance:





(c) Reinstall the TAIL relay.

NG -- REPLACE TAIL RELAY
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (BATTERY - TAIL RELAY)

(a) Remove the TAIL relay from the main body ECU.





(b) Measure the voltage according value(s) in the table below.

Standard voltage:





(c) Reinstall the TAIL relay.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU

5. INSPECT BULB (FRONT TURN SIGNAL LIGHT)

(a) Remove the front turn signal lights.





(b) Apply battery voltage to the terminals and check that the front turn signal light illuminates.

OK:





(c) Reinstall the front turn signal lights.

NG -- REPLACE BULB Disassembly
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT TURN SIGNAL LIGHT)

(a) Disconnect the A16 and A20 front turn signal light connectors.





(b) Disconnect the 1B main body ECU connector.

(c) Measure the resistance according value(s) in the table below.

Standard resistance:





(d) Reconnect the front turn signal light connectors.

(e) Reconnect the main body ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT TURN SIGNAL LIGHT - BODY GROUND)

7. INSPECT BULB (TAILLIGHT)

(a) Remove the taillights.





(b) Apply battery voltage to the terminals and check that the taillight illuminates.

OK:





(c) Reinstall the taillights.

NG -- REPLACE BULB Disassembly
OK -- Continue to next step.

8. INSPECT BULB (LICENSE PLATE LIGHT)

(a) Remove the license plate light.





(b) Apply battery voltage to the terminals and check that the license plate light illuminates.

OK:





(c) Reinstall the license plate light.

NG -- REPLACE BULB Removal
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - TAILLIGHT, LICENSE PLATE LIGHT)

(a) Disconnect the L11 and L14 taillight connectors.





(b) Disconnect the S1 license plate light connector.

(c) Disconnect the 1F main body ECU connector.

(d) Measure the resistance according value(s) in the table below.

Standard resistance:





(e) Reconnect the taillight connectors.

(f) Reconnect the license plate light connector.

(g) Reconnect the main body ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (TAILLIGHT, LICENSE PLATE LIGHT - BODY GROUND)

10. INSPECT BULB (OUTER REAR VIEW MIRROR ILLUMINATION LIGHT)

(a) Remove the outer rear view mirror assembly.





(b) Apply battery voltage to the terminals and check that the outer rear view mirror illumination light illuminates.

OK:





(c) Reinstall the outer rear view mirror assembly.

NG -- REPLACE BULB Removal
OK -- Continue to next step.

11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - OUTER REAR VIEW MIRROR ILLUMINATION LIGHT)

(a) Disconnect the H2 and G2 outer rear view mirror assembly connectors.





(b) Disconnect the 1L main body ECU connector.

(c) Measure the resistance according value(s) in the table below.

Standard resistance:





(d) Reconnect the outer rear view mirror assembly connector.

(e) Reconnect the main body ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (OUTER REAR VIEW MIRROR ILLUMINATION LIGHT - BODY GROUND)