Lighting System Speed Signal Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK COMBINATION METER SYSTEM

CHECK HARNESS AND CONNECTOR (HEADLIGHT BEAM LEVEL CONTROL ECU - COMBINATION METER)

CHECK HARNESS AND CONNECTOR (HEADLIGHT BEAM LEVEL CONTROL ECU - NO. 3 J/B)

DESCRIPTION

HINT:

1. A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal is changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respective system based on the pulse signal.
   
2. If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the diagram below will not operate normally.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

1. The circuits that send vehicle speed signals to this system are inspected in the meter system (CAMRY_ACV40 RM000002UD700KX.html).
   

2. During inspection for the meter section, if there is an instruction that indicates to go back inspections for each system, proceed to the next step.
   

1. Disconnect the F2 combination meter connector.
   

2. Disconnect the A20 headlight beam level control ECU connector.
   

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

   Standard resistance:

   Tester connection	Condition	Specified condition
   A20-16 (SPDR) - F2-12 (+S)	Always	Below 1 Ω
   A20-16 (SPDR) - Body ground	Always	10 kΩ or higher

1. Disconnect the No. 3 J/B connector.
   

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

   
   
   
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   3B-10 - A20-16 (SPDR)	Always	Below 1 Ω