Headlight Beam Level Control System: Inspection

1. INSPECT HEADLIGHT BEAM LEVEL CONTROL ACTUATOR RESISTANCE 
   1. Check that continuity exists between terminal 2 and 5.
      Fig 1: Checking Continuity Exists Between Terminals 2 & 5

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   2. Check that resistance exists between terminal, as shown in HEADLIGHT BEAM LEVEL CONTROL ACTUATOR TERMINALS RESISTANCE  .
   HEADLIGHT BEAM LEVEL CONTROL ACTUATOR TERMINALS RESISTANCE
   
   

   Terminal	Resistance (Ω)
   2-1	26-30
   2-3	26-30
   2-4	26-30
   2-6	26-30
   5-1	26-30
   5-3	26-30
   5-4	26-30
   5-6	26-30

   If resistance value is not as specified, replace the actuator.

2. Connector disconnected: 

   INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT 

   Disconnect the connector from the ECU and inspect the connector on the wire harness side, as shown in Fig 2 .

   Fig 2: Inspecting Headlight Beam Level Control ECU Circuit (Connector Disconnected)

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   HEADLIGHT BEAM LEVEL CONTROL ECU TERMINALS RESISTANCE
   
   

   Tester connection	Condition	Specified condition
   1-13	Ignition switch OFF	26 - 30 Ω
   1-15	Ignition switch OFF	26 - 30 Ω
   1-14	Ignition switch OFF	26 - 30 Ω
   1-16	Ignition switch OFF	26 - 30 Ω
   1-4	Ignition switch OFF	26 - 30 Ω
   1-2	Ignition switch OFF	26 - 30 Ω
   1-12	Ignition switch OFF	26 - 30 Ω
   1-3	Ignition switch OFF	26 - 30 Ω
   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

   If circuit is not as specified, perform the inspection in step  3 .

3. Connector connected: 

   INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT 

   Connect the connector from the ECU and inspect the connector on the back side, as shown in Fig 3 .

   Fig 3: Inspecting Headlight Beam Level Control ECU Circuit (Connector Connected)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   HEADLIGHT BEAM LEVEL CONTROL ECU TERMINALS VOLTAGE AND CONTINUITY
   
   

   Tester connection	Condition	Specified condition
   1-20	Ignition switch ON	Battery positive voltage
   13-20	Ignition switch ON, when keep and bounce the vehicle	*1 Pulse generation
   15-20	Ignition switch ON, when keep and bounce the vehicle	*1 Pulse generation
   14-20	Ignition switch ON, when keep and bounce the vehicle	*1 Pulse generation
   16-20	Ignition switch ON, when keep and bounce the vehicle	*1 Pulse generation
   10-17	Ignition switch ON	Approx. 2.5 V
   18-20	Ignition switch ON	No continuity
   4-20	Ignition switch ON, when keep and bounce the vehicle	*1 Pulse generation
   2-20	Ignition switch ON, when keep and bounce the vehicle	*1 Pulse generation
   12-20	Ignition switch ON, when keep and bounce the vehicle	*1 Pulse generation
   3-20	Ignition switch ON, when keep and bounce the vehicle	*1 Pulse generation
   5-11	Ignition switch ON	Approx. 2.5 V
   11-20	Ignition switch OFF	Continuity
   10-17	Ignition switch OFF	Continuity
   6-10	Ignition switch ON	5 V
   7-11	Ignition switch ON	5 V
   10-20	Ignition switch OFF	Continuity
   20 - Body ground	Ignition switch OFF	Continuity

   If the circuit is not as specified, replace the ECU.

Reference INSPECTION USING OSCILLOSCOPE 

HINT:

The correct waveform is as shown in Fig 4 .

Fig 4: Identifying Correct Waveform Of Pulse Generation

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002