Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM000001D5L001X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: LIGHTING: AUTOMATIC LIGHT CONTROL SENSOR: ON-VEHICLE INSPECTION; 2007 MY LX470 [08/2006 -        ]

ON-VEHICLE INSPECTION

1. CHECK AUTOMATIC LIGHT CONTROL SENSOR

(a) Disconnect the A31 sensor connector.

(b) Measure the voltage and resistance of the wire harness side connector.

HINT:

  • Ignition switch ON
  • Light control switch AUTO
  • Vehicle's surroundings are bright

Standard voltage:

OK

Tester Connection

Condition

Specified Condition

A31-3 - Body ground

Ignition switch ON

5.2 to 9.0 V

Close driver's door again while ignition switch OFF

Below 1 V

Tester Connection

Specified Condition

A31-6 - Body ground

Continuity

  • If the result is not as specified, repair or replace the wire harness or connector.

(c) Reconnect the A31 sensor connector.

(d) Measure the voltage of the connector.

  • Ignition switch ON
  • Light control switch AUTO
  • Vehicle's surroundings are bright

Standard voltage:

Tester Connection

Condition

Specified Condition

A31-3 - Body ground

Ignition switch ON

10 to 14 V

A31-4 - Body ground

Always

Pulse generation

  • If the result is not as specified, repair or replace the wire harness or connector.