Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS AND CONNECTOR (INFRARED RAY SENSOR - AIR CONDITIONING AMPLIFIER)

Disconnect the X13 infrared ray sensor connector
Disconnect the L76 air conditioning amplifier connector

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

Standard resistance

TESTER CONNECTOR SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
X13-3 (LIN1) - L76-28 (LIN1)	Always	Below 1 Ω
X13-3 (LIN1) - Body ground	Always	10 kΩ or higher
L76-28 (LIN1) - Body ground	Always	10 kΩ or higher

Fig 1: Identifying Terminals Of X13 Infrared Ray Sensor And L76 Air Conditioning Amplifier Connectors

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

REPLACE INFRARED RAY SENSOR
1. Replace the infrared ray sensor with a normal one (see REMOVAL )
RECHECK DTC
1. Clear the DTCs (see DTC CHECK / CLEAR ).
2. Check for DTCs (see DTC CHECK / CLEAR )
  OK: DTC B1492 is not output.
NG: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

OK: END (INFRARED RAY SENSOR IS DEFECTIVE)