DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK TAILLIGHT (OPERATION)
PERFORM ACTIVE TEST BY INTELLIGENT TESTER
CHECK HARNESS AND CONNECTOR (HEADLIGHT - BODY GROUND)
CHECK HARNESS AND CONNECTOR (HEADLIGHT - BODY GROUND)
CHECK HARNESS AND CONNECTOR (HEADLIGHT - ENGINE ROOM NO. 2 R/B)
PERFORM ACTIVE TEST BY INTELLIGENT TESTER
CHECK HARNESS AND CONNECTOR (INNER TAILLIGHT - BODY GROUND)
CHECK HARNESS AND CONNECTOR (INNER TAILLIGHT - MAIN BODY ECU LH)
CHECK HARNESS AND CONNECTOR (OUTER TAILLIGHT - BODY GROUND)
CHECK HARNESS AND CONNECTOR (OUTER TAILLIGHT - MAIN BODY ECU LH)
CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT LH - BODY GROUND)
CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT RH - MAIN BODY ECU LH)
CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT LH - LICENSE PLATE LIGHT RH)
CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT LH - LICENSE PLATE LIGHT RH)
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BODY GROUND)
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BODY GROUND)
INSPECT MAIN BODY ECU LH (COWL SIDE J/B LH)
LIGHTING SYSTEM - Taillight Circuit
DESCRIPTION
Front light:
The front controller controls the operation of the FR TAIL relay. The FR TAIL relay turns on the front parking lights.
The front controller receives front 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 and license plate lights.
The main body ECU RH receives taillight and license plate 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
- Before proceeding to the following flowchart, check that the fuses are not blown and that the bulbs are not burned out.
| 1.CHECK TAILLIGHT (OPERATION) |
Turn the engine switch on (IG).
When the taillight switch is operated, check that the following lights illuminate.
The front lights (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 and license plate 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:
| Result | Proceed to |
| Neither front nor rear lights illuminate | A |
| Front lights (parking lights) do not illuminate | B |
| Rear lights (taillights and license plate lights) do not illuminate | C |
| A | |
| |
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 2.PERFORM ACTIVE TEST BY INTELLIGENT TESTER |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the intelligent tester on.
Select the item(s) below in the ACTIVE TEST, and check the operation.
ACTIVE TEST: Body No. 5 (Front Controller)| Item | Test Details | Diagnostic Note |
| Clearance Light Operation | Clearance light (Front parking lights) ON / OFF | - |
- OK:
- Front parking lights illuminate.
| OK | |
| |
| REPLACE ENGINE ROOM NO. 2 R/B (FRONT CONTROLLER) |
|
| 3.CHECK HARNESS AND CONNECTOR (HEADLIGHT - BODY GROUND) |
- Perform the following inspection on either the LH or RH side.
Disconnect the B2 or B12 headlight connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
- RH side:
| Tester Connection | Condition | Specified Condition |
| B2-8 (E) - Body ground | Always | Below 1 Ω |
- LH side:
| Tester Connection | Condition | Specified Condition |
| B12-8 (E) - Body ground | Always | Below 1 Ω |
| OK | |
| |
| REPLACE HEADLIGHT ASSEMBLY |
|
| 5.CHECK HARNESS AND CONNECTOR (HEADLIGHT - ENGINE ROOM NO. 2 R/B) |
- Perform the following inspection on either the LH or RH side.
Disconnect the B2 or B12 headlight connector.
Disconnect the 2G engine room R/B No. 2 connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
- RH side:
| Tester Connection | Condition | Specified Condition |
| B2-7 (B) - 2G-8 | Always | Below 1 Ω |
| B2-7 (B) - Body ground | Always | 10 kΩ or higher |
- LH side:
| Tester Connection | Condition | Specified Condition |
| B12-7 (B) - 2G-9 | Always | Below 1 Ω |
| B12-7 (B) - Body ground | Always | 10 kΩ or higher |
| 7.CHECK HARNESS AND CONNECTOR (INNER TAILLIGHT - BODY GROUND) |
- Perform the following inspection on either the LH or RH side.
Disconnect the Q46 or Q40 inner taillight connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
- RH side:
| Tester Connection | Condition | Specified Condition |
| Q46-3 - Body ground | Always | Below 1 Ω |
- LH side:
| Tester Connection | Condition | Specified Condition |
| Q40-3 - Body ground | Always | Below 1 Ω |
| OK | |
| |
| REPLACE LICENSE PLATE LIGHT (LH SIDE) |
|
| 14.CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT LH - LICENSE PLATE LIGHT RH) |
Disconnect the Q44 license plate light RH connector.
Disconnect the Q47 license plate light LH connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| Q44-2 (E) - Q47-1 (B) | Always | Below 1 Ω |
| Q44-2 (E) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| REPLACE LICENSE PLATE LIGHT (RH SIDE) |
|
| 15.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BODY GROUND) |
Disconnect the RD main body ECU RH connector.
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
| Tester Connection | Condition | Specified Condition |
| RD-1 (TRLY) - Body ground | Always | 10 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 16.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BODY GROUND) |
Connect the RD main body ECU RH connector.
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
| Tester Connection | Condition | Specified Condition |
| RD-1 (TRLY) - Body ground | Engine switch off | Below 1 V |
| RD-1 (TRLY) - Body ground | Engine switch on (IG) and taillights on | 10 to 14 V |
| | REPLACE MAIN BODY ECU RH (COWL SIDE J/B RH) |
|
|
| 17.INSPECT MAIN BODY ECU LH (COWL SIDE J/B LH) |
Disconnect the LJ main body ECU LH connector.
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
| Tester Connection | Condition | Specified Condition |
| LJ-24 - Body ground | Engine switch off | Below 1 V |
| LJ-24 - Body ground | Engine switch on (IG) and taillights on | 10 to 14 V |
| | REPLACE MAIN BODY ECU LH (COWL SIDE J/B LH) |
|
|
| OK | |
| |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU LH - EACH REAR LIGHT) |
|
