Lexus NX: Taillight Relay Circuit
DESCRIPTION
Illumination of the taillights and license plate light is controlled by the main body ECU (multiplex network body ECU).
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
- Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
-
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.
Click here
.gif)
PROCEDURE
| 1. | PERFORM ACTIVE TEST USING TECHSTREAM (TAILLIGHT RELAY) |
(a) Using the Techstream, perform the Active Test.
Click here
| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Taillight Relay | Taillight relay | ON or OFF | - |
| Tester Display |
|---|
| Taillight Relay |
| Result | Proceed to |
|---|---|
| Taillights, license lights and side marker lights come on | A |
| Taillights, license lights and side marker lights do not come on | B |
| A | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
.gif)
| 2. | CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY) |
(a) Disconnect the instrument panel junction block assembly connector.
| (b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
.png)
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Remove the instrument panel junction block assembly.
Click here
(b) Remove the instrument panel junction block assembly.
Click here
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 4A-37 - Battery negative (-) terminal | Battery voltage applied between terminals 4F-1 and A-14 (TRLY) | 11 to 14 V |
| Battery voltage not applied between terminals 4F-1 and A-14 (TRLY) | Below 1 V | |
| 4A-38 - Battery negative (-) terminal | Battery voltage applied between terminals 4F-1 and A-14 (TRLY) | 11 to 14 V |
| Battery voltage not applied between terminals 4F-1 and A-14 (TRLY) | Below 1 V | |
| 4B-24 - Battery negative (-) terminal | Battery voltage applied between terminals 4F-1 and A-14 (TRLY) | 11 to 14 V |
| Battery voltage not applied between terminals 4F-1 and A-14 (TRLY) | Below 1 V | |
| 4B-25 - Battery negative (-) terminal | Battery voltage applied between terminals 4F-1 and A-14 (TRLY) | 11 to 14 V |
| Battery voltage not applied between terminals 4F-1 and A-14 (TRLY) | Below 1 V | |
| 4B-25 - Battery negative (-) terminal | Battery voltage applied between terminals 4F-1 and A-14 (TRLY) | 11 to 14 V |
| Battery voltage not applied between terminals 4F-1 and A-14 (TRLY) | Below 1 V |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
READ NEXT:
Power Source Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) receives IG signals and supplies power to the headlight ECU sub-assembly via the H-LP relay. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE:
Cornering Light Circuit
DESCRIPTION The illumination of the fog light assembly (cornering light) is controlled by the headlight ECU sub-assembly. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE:
The light system (for Tripl
SEE MORE:
Reassembly
REASSEMBLY CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE 1. INSTALL REAR LIGHT SOCKET AND WIRE LH (a) Attach the wire harness clamp and connect the connector to install the rear light socket and wire LH.
DC / DC Converter Performance (P0A94-550,P0E32-564)
DTC SUMMARY MALFUNCTION DESCRIPTION These DTCs indicate a malfunction inside the inverter for the motor. The cause of this malfunction may be one of the following: Internal inverter malfunction
Internal circuit malfunction in the inverter for the motor
Malfunction in the sensors for inverter co
