Taillight Circuit
LIGHTING (EXT): LIGHTING SYSTEM: Taillight Circuit
- Taillight Circuit
DESCRIPTION
Front lights (HID Type, w/ Daytime running lights):
* The front controller controls the operation of the FR TAIL relay. The FR TAIL relay turns on the front side marker lights and an IC relay in the front controller operates the parking lights.
Front lights (HID Type, w/o Daytime running lights or Except HID Type):
* 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 and IC relays.
* The FR TAIL relay is built into the front controller, so unlike conventional relays, it cannot be removed for inspection.
Rear lights:
* 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 junction block LH, so unlike conventional relays, it cannot be removed for inspection.
WIRING DIAGRAM
1. Front Lights (HID Type, w/ Daytime Running Lights)
2. Front Lights (HID Type, w/o Daytime Running Lights)
3. Front Lights (Except HID Type)
4. Rear Lights
INSPECTION PROCEDURE
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
* HID Type, w/ Daytime running lights
The front lights (front side marker lights and parking lights) are operated by the front controller via either a mechanical relay or built-in IC relay. If one of the front lights does not illuminate, there may be a problem in the circuit between the relay and light, or in the circuit between the light and ground.
* HID Type, w/o Daytime running lights or Except HID Type
The front lights (front side marker lights and parking lights) are operated by the front controller via a mechanical relay. If one of the front lights does not illuminate, there may be a problem in the circuit between the relay and light, or in the circuit between the light and ground.
* 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 SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Exterior Lighting System
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 that the clearance lights operate.
Body No. 5 (Front Controller)
OK:
Front side marker lights and parking lights illuminate.
Result:
C -- CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BODY GROUND)
B -- CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BODY GROUND)
A -- REPLACE FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU)
3. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BODY GROUND)
HINT
Perform the following inspection on either the LH or RH side.
(a) Disconnect the B2 or B12 headlight assembly 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 ASSEMBLY - FRONT CONTROLLER)
HINT
Perform the following inspection on either the LH or RH side.
(a) Disconnect the B2 or B12 headlight assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
RH Side
LH Side
Result:
C -- CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - FRONT CONTROLLER)
B -- CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - FRONT CONTROLLER)
A -- REPLACE HEADLIGHT ASSEMBLY Components
5. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - FRONT CONTROLLER)
HINT
Perform the following inspection on either the LH or RH side.
(a) Disconnect the B2 and B12 headlight assembly connector.
(b) Disconnect the 2G front controller 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 FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU)
6. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - FRONT CONTROLLER)
HINT
Perform the following inspection on either the LH or RH side.
(a) Disconnect the B2 or B12 headlight assembly connector.
(b) Disconnect the 2G front controller 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 FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU)
7. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BODY GROUND)
HINT
Perform the following inspection on either the LH or RH side.
(a) Disconnect the B2 or B12 headlight assembly 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 (HEADLIGHT ASSEMBLY - FRONT CONTROLLER)
HINT
Perform the following inspection on either the LH or RH side.
(a) Disconnect the B2 or B12 headlight assembly 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 ASSEMBLY - FRONT CONTROLLER)
OK -- REPLACE HEADLIGHT ASSEMBLY Components
9. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - FRONT CONTROLLER)
HINT
Perform the following inspection on either the LH or RH side.
(a) Disconnect the B2 or B12 headlight assembly connector.
(b) Disconnect the 2G front controller 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 FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU)
10. 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 assembly.
E -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BATTERY)
D -- REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)
C -- CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY LH - BODY GROUND)
B -- CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY - BODY GROUND)
A -- Continue to next step.
11. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY - BODY GROUND)
HINT
Perform the following inspection on either the LH or RH side.
(a) Disconnect the h1 or h6 rear light assembly 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.
12. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY - MAIN BODY ECU LH)
HINT
Perform the following inspection on either the LH or RH side.
(a) Disconnect the h1 or h6 rear light assembly 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 REAR LIGHT ASSEMBLY
13. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY - BODY GROUND)
HINT
Perform the following inspection on either the LH or RH side.
(a) Disconnect the Q51 or Q50 rear combination light assembly 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.
14. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY - MAIN BODY ECU LH)
HINT
Perform the following inspection on either the LH or RH side.
(a) Disconnect the Q51 or Q50 rear combination light assembly 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 REAR COMBINATION LIGHT ASSEMBLY
15. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY LH - BODY GROUND)
HINT
Perform the following inspection on the LH side.
(a) Disconnect the h2 license plate light assembly 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.
16. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY LH - MAIN BODY ECU LH)
HINT
Perform the following inspection on the LH side.
(a) Disconnect the h2 license plate light assembly LH connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY RH - MAIN BODY ECU LH)
OK -- REPLACE LICENSE PLATE LIGHT ASSEMBLY LH
17. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY RH - MAIN BODY ECU LH)
HINT
Perform the following inspection on the RH side.
(a) Disconnect the h3 license plate light assembly 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.
18. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY LH - LIGHT ASSEMBLY RH)
(a) Disconnect the h3 license plate light assembly RH connector.
(b) Disconnect the h2 license plate light assembly 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 ASSEMBLY RH
19. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BATTERY)
(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.
20. INSPECT MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)
(a) Connect the RD main body ECU RH connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)
OK -- Continue to next step.
21. INSPECT MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU LH - EACH REAR LIGHT)