Headlight Beam Level Control ECU Communication Circuit

LIGHTING: LIGHTING SYSTEM: Headlight Beam Level Control ECU Communication Circuit

Headlight Beam Level Control ECU Communication Circuit

DESCRIPTION

Cowl side junction block ECU LH receives error signals from the headlight leveling system. It also sends generator terminal signal to headlight beam level control ECU. The headlight beam level control ECU also receives vehicle speed signal from skid control ECU, thus controlling headlight beam level control motor.

WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (HEADLIGHT BEAM LEVEL CONTROL ECU - COWL SIDE JUNCTION BLOCK ECU LH)





(a) Disconnect the A43 headlight beam level control ECU connector.
(b) Disconnect the A30 cowl side junction block ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
2. CHECK WIRE HARNESS (HEADLIGHT BEAM LEVEL CONTROL ECU - SKID CONTROL ECU WITH ACTUATOR OR SKID CONTROL ECU)





(a) Check the wire harness between the headlight beam level control ECU and skid control ECU (2GR-FSE).
(1) Disconnect the A43 headlight beam level control ECU connector.
(2) Disconnect the A58 skid control ECU connector.
(3) Measure the resistance of the wire harness side connectors.
Standard resistance:










(b) Check the wire harness between the headlight beam level control ECU and skid control ECU (1UR-FSE).
(1) Disconnect the A43 headlight beam level control ECU connector.
(2) Disconnect the A13 and A15 skid control ECU connector.
(3) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE