Low Beam Headlight Circuit

LIGHTING (EXT): LIGHTING SYSTEM: Low Beam Headlight Circuit
- Low Beam Headlight Circuit

DESCRIPTION

The main body ECU receives headlight dimmer switch information signals and illuminates the low beam headlights.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
Inspect the fuses and bulbs for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT RELAY)

(a) Using the Techstream, perform the Active Test Exterior Lighting System.

Main Body

OK:

Headlight relay operates (low beam headlights illuminate).

NG -- INSPECT HEADLIGHT RELAY (H-LP)

OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal

2. INSPECT HEADLIGHT RELAY (H-LP)

(a) Remove the headlight relay from the engine room relay block.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG -- REPLACE HEADLIGHT RELAY (H-LP)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP] - BATTERY)

(a) Remove the headlight relay from the engine room relay block.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY)

(a) Disconnect the 2B instrument panel junction block connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly Removal.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Removal

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Exterior Lighting System