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 HEADLIGHT

Turn the power switch ON (READY)

Check that the headlights (Lo/Hi) turn on

OK: Headlights turn on normally.

HINT:

If the near infrared ray filter is stuck in the activated position, the headlights will seem as if they are not in Hi beam mode (only a dim, red light will be emitted). If this occurs, it is necessary to replace the headlight assembly.

Result

RESULT CHART

Result	Proceed to
OK	A
NG (for HID headlight)	B
NG (for LED headlight)	C

B: REPAIR OR REPLACE HEADLIGHT (see REMOVAL )

C: REPAIR OR REPLACE HEADLIGHT (see REMOVAL )

A: Go to next step

CHECK HARNESS AND CONNECTOR (OBJECT RECOGNITION ECU - HEADLIGHT)

Disconnect the R25 ECU connector.

for LH:

Disconnect the B1 headlight connector.
Measure the resistance according to the value (s) in the table below.

Fig 1: Identifying Object Recognition ECU And LH Headlight Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
R25-7 (IRL) - B1-6 (IRFL)	Always	Below 1 Ω
R25-9 (IRDV) - B1-5 (IRLY)	Always	Below 1 Ω
R25-11 (IRFP) - B1-19 (RFOT)	Always	Below 1 Ω
R25-7 (IRL) - Body ground	Always	10 kΩ or higher
R25-9 (IRDV) - Body ground	Always	10 kΩ or higher
R25-11 (IRFP) - Body ground	Always	10 kΩ or higher

for RH-
1. Disconnect the B11 headlight connector
2. Measure the resistance according to the value (s) in the table below.

Fig 2: Identifying Object Recognition ECU And RH Headlight Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
R25-3 (IRR) - B11-6 (IRFR)	Always	Below 1 Ω
R25-9 (IRDV) - B11-5 (IRLY)	Always	Below 1 Ω
R25-11 (IRFP) - B11-19 (RFOT)	Always	Below 1 Ω
R25-3 (IRR) - Body ground	Always	10 kΩ or higher
R25-9 (IRDV) - Body ground	Always	10 kΩ or higher
R25-11 (IRFP) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

PERFORM ACTIVE TEST USING Intelligent tester OR TECHSTREAM (NEAR INFRARED RAY FILTER)

Using the Intelligent tester or Techstream, enter the following menus

Intelligent tester - Select DIAGNOSIS / OBD/MOBD / PRE-COLLISION 2 / ACTIVE TEST

PRE-COLLISION 2

ACTIVE TEST CHART

Tester Display	Test Part	Control Range	Diagnostic Note
INFRARED SIGNAL	Near infrared ray filter operates	ON/OFF	-

Techstream - Select' Body Electrical / Pre-Collision 2 / Active Test.

Pre-Collision 2

ACTIVE TEST CHART

Tester Display	Test Part	Control Range	Diagnostic Note
Infrared Signal Status	Near infrared ray filter operates	ON / OFF	-

OK: Near infrared ray filter operates normally.

HINT:

When the near infrared ray filter is operated, the headlights illuminate in a faint red color.

Result

RESULT CHART

Result	Proceed to
OK	A
NG (for HID headlight)	B
NG (for LED headlight)	C

B: REPLACE HEADLIGHT (see REMOVAL )

C: REPLACE HEADLIGHT (see REMOVAL )

A: Go to next step

CHECK OBJECT RECOGNITION ECU

Reconnect the R25 ECU connector.
Disconnect the B1*1 and B11*2 headlight connectors.
HINT

*1. for LH

*2: for RH
Measure the resistance according to the value (s) in the table below.

Fig 3: Identifying Object Recognition ECU Connector Terminals

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
R25-3 (IRR) - Body ground	Always	10 kΩ or higher
R25-7 (IRL) - Body ground	Always	10 kΩ or higher

NG: REPLACE OBJECT RECOGNITION ECU (See REMOVAL )

OK: Go to next step

CHECK HEADLIGHT (NEAR INFRARED RAY FILTER SIGNAL)

Reconnect the B1*1 and B11*2 headlight connectors
HINT:

*1 for LH

*2. for RH

Fig 4: Identifying Object Recognition ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Using the Intelligent tester or Techstream, enter the following menus.
1. Intelligent tester - Select DIAGNOSIS/OBD/MOBD / PRE-COLLISION 2 / ACTIVE TEST.
2. Techstream - Select. Body Electrical / Pre-Collision 2 / Active Test.
Select "INFRARED SIGNAL*3" or "Infrared Signal Status*4", and perform the ACTIVE TEST.
HINT

*3. for Intelligent tester

*4. for Techstream
Measure the voltage according to the value (s) in the table below

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
R25-3 (IRR) - Body ground	ACTIVE TEST is performed	5.5 V or higher
R25-3 (IRR) - Body ground	ACTIVE TEST is not performed	Below 1 V
R25-7 (IRL) - Body ground	ACTIVE TEST is performed	5.5 V or higher
R25-7 (IRL) - Body ground	ACTIVE TEST is not performed	Below 1 V

Result

RESULT CHART

Result	Proceed to
OK	A
NG (for HID headlight)	B
NG (for LED headlight)	C

B: REPLACE HEADLIGHT (see REMOVAL )

C: REPLACE HEADLIGHT (see REMOVAL )

A: Go to next step

REPLACE OBJECT RECOGNITION ECU
1. Replace the object recognition ECU (see REMOVAL ).
CHECK FOR DTC
1. Using the Intelligent tester or Techstream, enter the following menus:
  1. Intelligent tester - Select. DIAGNOSIS/OBD/MOBD / PRE-COLLISION 2 / DTC INFO.
  2. Techstream - Select: Body Electrical / Pre-Collision 2 / Trouble Code.
2. Select "CLEAR" and clear the data.
3. Recheck for DTC
OK: DTC C1A6A is not output

NG: REPLACE DRIVING SUPPORT ECU (See REMOVAL )

OK: END