Headlight Beam Level Control System: Inspection

1. INSPECT HEADLIGHT BEAM LEVEL CONTROL ACTUATOR RESISTANCE 
   1. Check that continuity exists between terminal 2 and 5.
   2. Check that resistance exists between terminal, as shown in the chart.
      TERMINAL 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.

      Fig 1: Inspecting Headlight Beam Level Control Actuator Resistance

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.

   Fig 2: Identifying Connector Wire Harness Side

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   SPECIFIED CONDITION
   
   

   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 on the following page.

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 the chart.

   Fig 3: Identifying Connector Back Side

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   SPECIFIED CONDITION
   
   

   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 the illustration.

Fig 4: Identifying Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002