High Beam Headlight Circuit

LIGHTING (EXT): LIGHTING SYSTEM: High Beam Headlight Circuit; 2013 MY FR-S [03/2012 -]
- High Beam Headlight Circuit

DESCRIPTION

The main body ECU (network gateway ECU) receives headlight dimmer switch information signals, and illuminates the high beam headlight.

WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (HEAD LIGHT HI)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Active Test

(e) Check that the relay operates.

Main Body





OK:

Relay operates (high beam headlights illuminate).

Result:





B -- REPLACE MAIN BODY ECU (NETWORK GATEWAY ECU) Removal
A -- Continue to next step.

2. INSPECT DIM RELAY

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

(b) Inspect the DIM relay Testing and Inspection.

NG -- REPLACE DIM RELAY
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (BATTERY - DIM RELAY)









(a) 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.

4. CHECK HARNESS AND CONNECTOR (DIM RELAY - MAIN BODY ECU (NETWORK GATEWAY ECU))

(a) Disconnect the A73 main body ECU (network gateway ECU) connector.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

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