Taillight Circuit
LIGHTING: LIGHTING SYSTEM: Taillight Circuit
Taillight Circuit
DESCRIPTION
Front light:
The front controller controls the operation of the FR TAIL relay. The FR TAIL relay turns on the front side marker lights and parking lights.
The front controller receives front side marker and parking light ON request signals from the combination switch ECU through BEAN communication and activates the FR TAIL relay.
The FR TAIL relay is built into the front controller, so unlike conventional relays, it cannot be removed for inspection.
Rear light:
The main body ECU RH controls the operation of the TAIL relay. The TAIL relay turns on the taillights, license plate lights, and side marker lights.
The main body ECU RH receives taillight, license plate light, and side marker light ON request signals from the combination switch ECU through BEAN communication and activates the TAIL relay.
The TAIL relay is built into the cowl side J/B LH, so unlike conventional relays, it cannot be removed for inspection.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTE:
Before proceeding to the following flowchart, check that the fuses are not blown and that the bulbs are not burned out.
PROCEDURE
1. CHECK TAILLIGHT (OPERATION)
(a) Turn the engine switch on (IG).
(b) When the taillight switch is operated, check that the following lights illuminate.
HINT:
- The front lights (front side marker lights and parking lights) share the same drive circuit. Therefore, if one of the front lights does not come on, there may be a problem in the circuit between the FR TAIL relay and bulb, or the circuit between the bulb and body ground. Inspect those circuits to identify the problem.
- The rear lights (taillights, license plate lights, and side marker lights) share the same drive circuit. Therefore, if one of the rear lights does not come on, there may be a problem in the circuit between the TAIL relay and the bulb or LED, or the circuit between the bulb or LED and body ground. Inspect those circuits to identify the problem.
Result:
C -- PERFORM ACTIVE TEST USING TECHSTREAM
B -- PERFORM ACTIVE TEST USING TECHSTREAM
A -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Body No. 5 / Active Test.
(e) Check the operation.
Body No. 5 (Front Controller):
OK:
Front side marker lights and parking lights illuminate.
NG -- CHECK HARNESS AND CONNECTOR (HEADLIGHT - BODY GROUND)
OK -- REPLACE ENGINE ROOM NO. 2 R/B (FRONT CONTROLLER)
3. CHECK HARNESS AND CONNECTOR (HEADLIGHT - BODY GROUND)
HINT:
Perform the following inspection on either the LH or RH side.
(a) Disconnect the B2 or B12 headlight connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
RH side
LH side
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (HEADLIGHT - BODY GROUND)
HINT:
Perform the following inspection on either the LH or RH side.
(a) Disconnect the B2 or B12 headlight connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
RH side
LH side
NG -- CHECK HARNESS AND CONNECTOR (HEADLIGHT - ENGINE ROOM NO. 2 R/B)
OK -- REPLACE HEADLIGHT ASSEMBLY
5. CHECK HARNESS AND CONNECTOR (HEADLIGHT - ENGINE ROOM NO. 2 R/B)
HINT:
Perform the following inspection on either the LH or RH side.
(a) Disconnect the B2 or B12 headlight connector.
(b) Disconnect the 2G engine room No. 2 R/B connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
RH side
LH side
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ENGINE ROOM NO. 2 R/B (FRONT CONTROLLER)
6. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Body / Active Test.
(e) Check the operation.
Body (Main Body ECU RH):
OK:
Taillights, license plate lights and side marker lights illuminate.
Result:
HINT:
If the outer taillights illuminate normally, but the side marker lights do not illuminate, or vice versa, there is an open circuit in the rear combination light.
E -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BODY GROUND)
D -- REPLACE MAIN BODY ECU RH (COWL SIDE J/B RH)
C -- CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT LH - BODY GROUND)
B -- CHECK HARNESS AND CONNECTOR (OUTER TAILLIGHT - BODY GROUND)
A -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (INNER TAILLIGHT - BODY GROUND)
HINT:
Perform the following inspection on either the LH or RH side.
(a) Disconnect the Q46 or Q40 inner taillight connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
RH side
LH side
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (INNER TAILLIGHT - MAIN BODY ECU LH)
HINT:
Perform the following inspection on either the LH or RH side.
(a) Disconnect the Q46 or Q40 inner taillight connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
RH side
LH side
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE INNER COMBINATION LIGHT
9. CHECK HARNESS AND CONNECTOR (OUTER TAILLIGHT - BODY GROUND)
HINT:
Perform the following inspection on either the LH or RH side.
(a) Disconnect the Q51 or Q50 outer taillight connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
RH side
LH side
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (OUTER TAILLIGHT - MAIN BODY ECU LH)
HINT:
Perform the following inspection on either the LH or RH side.
(a) Disconnect the Q51 or Q50 outer taillight connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
RH side
LH side
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE OUTER COMBINATION LIGHT
11. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT LH - BODY GROUND)
HINT:
Perform the following inspection on the LH side.
(a) Disconnect the Q47 license plate light LH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
12. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT RH - MAIN BODY ECU LH)
HINT:
Perform the following inspection on the RH side.
(a) Disconnect the Q44 license plate light RH connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
13. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT LH - LICENSE PLATE LIGHT LH)
HINT:
Perform the following inspection on the LH side.
(a) Connect the Q44 license plate light RH connector.
(b) Disconnect the Q47 license plate light LH connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT LH - LICENSE PLATE LIGHT RH)
OK -- REPLACE LICENSE PLATE LIGHT (LH SIDE)
14. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT LH - LICENSE PLATE LIGHT RH)
(a) Disconnect the Q44 license plate light RH connector.
(b) Disconnect the Q47 license plate light LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE LICENSE PLATE LIGHT (RH SIDE)
15. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BODY GROUND)
(a) Disconnect the RD main body ECU RH connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
16. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - MAIN BODY ECU LH)
(a) Connect the RD main body ECU RH connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPLACE MAIN BODY ECU RH (COWL SIDE J/B RH)
OK -- Continue to next step.
17. INSPECT MAIN BODY ECU LH (COWL SIDE J/B LH)
(a) Disconnect the LJ main body ECU LH connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPLACE MAIN BODY ECU LH (COWL SIDE J/B LH)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU LH - EACH REAR LIGHT)