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.
PROCEDURE
| 1. | PERFORM ACTIVE TEST USING TECHSTREAM (TAILLIGHT RELAY) |
(a) Using the Techstream, perform the Active Test.
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| 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, clearance light and side marker lights come on | A |
| Taillights, license lights, clearance light and side marker lights do not come on | B |
| A | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
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| 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:
|
|
| 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-26 - 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:
Low Beam Headlight Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) controls the low beam headlights. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE:
Inspect the fuses for circuits related to this system be
High Beam Headlight Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) controls the high beam headlights. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE:
Inspect the fuses for circuits related to this system b
SEE MORE:
Installation
INSTALLATION PROCEDURE 1. INSTALL STOP LIGHT CONTROL ECU ASSEMBLY (a) Attach the clamp to install the stop light control ECU assembly. (b) Connect the connector. 2. INSTALL LOWER NO. 1 INSTRUMENT PANEL FINISH PANEL Click here 3. INSTALL NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY Click here
Warning lights and indicators
The warning lights and indicators inform the driver of the status of
the vehicle's
various systems.
Instrument cluster
For the purpose of explanation, the following illustration displays all
warning lights
and indicators illuminated.
The units used on the meter and some indicators may dif
