Headlight Beam Level Control Ecu Circuit
WARNING: This page is about a different car, the 2003 Lexus IS 300 and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
- Connector Disconnected -
Disconnect the connector from the ECU and inspect the connector on the wiring harness side. See CONNECTOR IDENTIFICATION . See INSPECTING HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT (CONNECTOR DISCONNECTED) table. If the circuit is not as specified, go to step 2.INSPECTING HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT (CONNECTOR DISCONNECTED)
Tester Connection Condition Specified Condition 1 - 13 Ignition Switch OFF 26 - 30 Ohms 1 - 15 Ignition Switch OFF 26 - 30 Ohms 1 - 14 Ignition Switch OFF 26 - 30 Ohms 1 - 16 Ignition Switch OFF 26 - 30 Ohms 1 - 4 Ignition Switch OFF 26 - 30 Ohms 1 - 2 Ignition Switch OFF 26 - 30 Ohms 1 - 12 Ignition Switch OFF 26 - 30 Ohms 1 - 3 Ignition Switch OFF 26 - 30 Ohms 6 - 10 Ignition Switch OFF Continuity 7 - 11 Ignition Switch OFF Continuity 10 - 17 Ignition Switch OFF Continuity 5 - 11 Ignition Switch OFF Continuity 20 - Ground Ignition Switch OFF Continuity - Connector Connected -
Connect the connector from the ECU and inspect the connector on the back side. See CONNECTOR IDENTIFICATION . See INSPECTING HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT (CONNECTOR CONNECTED) table. If the circuit is not as specified, replace the ECU. See HEADLIGHTS under REMOVAL & INSTALLATION.INSPECTING HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT (CONNECTOR CONNECTED)
Tester Connection Condition Specified Condition 1 - 20 Ignition Switch ON B+ Voltage 13 - 20 Ignition Switch ON, When Keep & Bounce The Vehicle 1 Pulse Generation (1) 15 - 20 Ignition Switch ON, When Keep & Bounce The Vehicle 1 Pulse Generation (1) 14 - 20 Ignition Switch ON, When Keep & Bounce The Vehicle 1 Pulse Generation (1) 16 - 20 Ignition Switch ON, When Keep & Bounce The Vehicle 1 Pulse Generation (1) 10 - 17 Ignition Switch ON Approx. 2.5 Volts 18 - 20 Ignition Switch ON No Continuity 4 - 20 Ignition Switch ON, When Keep & Bounce The Vehicle 1 Pulse Generation (1) 2 - 20 Ignition Switch ON, When Keep & Bounce The Vehicle 1 Pulse Generation (1) 12 - 20 Ignition Switch ON, When Keep & Bounce The Vehicle 1 Pulse Generation (1) 3 - 20 Ignition Switch ON, When Keep & Bounce The Vehicle 1 Pulse Generation (1) 5 - 11 Ignition Switch ON Approx. 2.5 Volts 11 - 20 Ignition Switch OFF Continuity 10 - 17 Ignition Switch OFF Continuity 6 - 10 Ignition Switch ON 5 Volts 7 - 11 Ignition Switch ON 5 Volts 10 - 20 Ignition Switch OFF Continuity 20 - Body Ground Ignition Switch OFF Continuity (1) See Fig 1.