DTC C1A6A: Infrared Signal Circuit [09/2015 - ]: Procedure

CHECK LIGHTING SYSTEM
1. Check if the lighting system is malfunctioning (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - ] ).
  OK
  
  No malfunctions are present in the lighting system.
Result: NG

NG

GO TO LIGHTING SYSTEM

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - ] )

Result: OK

OK

See step 2
CHECK CAN COMMUNICATION SYSTEM
1. Use the Techstream to check if the CAN communication system is functioning normally (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - ] ).
  OK
  
  CAN communication DTCs are not output.
Result: NG

NG

GO TO CAN COMMUNICATION SYSTEM

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - ] )

Result: OK

OK

See step 3

PERFORM ACTIVE TEST USING TECHSTREAM

Select the Active Test, use the Techstream to generate a control command, and then check that the near infrared ray emitter operates (Refer to DATA LIST / ACTIVE TEST [09/2015 - ] ).

PRE-COLLISION 2

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

A blurred light is emitted.

Result: NG

See step 9

Result: OK

See step 4

CHECK OBJECT RECOGNITION ECU

Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Active Test.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Select "Infrared Signal Status", and perform the Active Test.

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

Standard voltage

Tester Connection	Condition	Specified Condition
g1-11 (IRFP) - Body ground	Engine switch on (IG) Active Test is performed	Battery voltage x 0.3 to Battery voltage x 0.6 V

Result: NG

See step 7

Result: OK

See step 5

CHECK OBJECT RECOGNITION ECU

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage

FOR LH

Tester Connection	Switch Condition	Specified Condition
g1-7 (IRL) - Body ground	Engine switch on (IG)	11 to 14 V

FOR RH

Tester Connection	Switch Condition	Specified Condition
g1-3 (IRR) - Body ground	Engine switch on (IG)	11 to 14 V

Result: OK

REPLACE OBJECT RECOGNITION ECU

(Refer to REMOVAL [09/2015 - ] )

Result: NG

See step 6

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - OBJECT RECOGNITION ECU AND BATTERY)

Disconnect the B1*1 and/or B11*2 headlight connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1: for LH
*2: for RH

Disconnect the g1 ECU connector.

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

Standard voltage

FOR LH

Tester Connection	Switch Condition	Specified Condition
B1-4 (SOL) - Body ground	Engine switch on (IG)	11 to 14 V

FOR RH

Tester Connection	Switch Condition	Specified Condition
B11-4 (SOL) - Body ground	Engine switch on (IG)	11 to 14 V

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

Standard resistance

FOR LH

Tester Connection	Condition	Specified Condition
B1-6 (IRFL) - g1-7 (IRL)	Always	Below 1 Ω
B1-6 (IRFL) or g1-7 (IRL) - Body ground	Always	10 kΩ or higher

FOR RH

Tester Connection	Condition	Specified Condition
B11-6 (IRFR) - g1-3 (IRR)	Always	Below 1 Ω
B11-6 (IRFR) or g1-3 (IRR) - Body ground	Always	10 kΩ or higher

RESULT

Result	Proceed to
OK (for LH and LED Headlight)	A
OK (for RH and LED Headlight)	B
OK (for LH and HID Headlight)	C
OK (for RH and HID Headlight)	D
NG	E

Result: A

REPLACE HEADLIGHT UNIT LH

(Refer to REMOVAL [09/2015 - ] )

Result: B

REPLACE HEADLIGHT UNIT RH

(Refer to REMOVAL [09/2015 - ] )

Result: C

REPLACE HEADLIGHT UNIT LH

(Refer to REMOVAL [09/2015 - ] )

Result: D

REPLACE HEADLIGHT UNIT RH

(Refer to REMOVAL [09/2015 - ] )

Result: E

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BATTERY AND BODY GROUND)

Disconnect the B1*1 and/or B11*2 headlight connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1: for LH
*2: for RH

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

Standard voltage

FOR LH

Tester Connection	Switch Condition	Specified Condition
B1-15 (IGED) - Body ground	Engine switch on (IG)	11 to 14 V

FOR RH

Tester Connection	Switch Condition	Specified Condition
B11-15 (IGED) - Body ground	Engine switch on (IG)	11 to 14 V

Result: NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result: OK

See step 8

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - OBJECT RECOGNITION ECU)

Disconnect the B1*1 and/or B11*2 headlight connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1: for LH
*2: for RH

Disconnect the g1 ECU connector.

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

Standard resistance

FOR LH

Tester Connection	Condition	Specified Condition
B1-19 (IRL) - g1-11 (IRFP)	Always	Below 1 Ω
B1-19 (IRL) or g1-11 (IRFP) - Body ground	Always	10 kΩ or higher

FOR RH

Tester Connection	Condition	Specified Condition
B11-19 (IRR) - g1-11 (IRFP)	Always	Below 1 Ω
B11-19 (IRR) or g1-11 (IRFP) - Body ground	Always	10 kΩ or higher

RESULT

Result	Proceed to
OK (for LH and LED Headlight)	A
OK (for RH and LED Headlight)	B
OK (for LH and HID Headlight)	C
OK (for RH and HID Headlight)	D
NG	E

Result: A

REPLACE HEADLIGHT UNIT LH

(Refer to REMOVAL [09/2015 - ] )

Result: B

REPLACE HEADLIGHT UNIT RH

(Refer to REMOVAL [09/2015 - ] )

Result: C

REPLACE HEADLIGHT UNIT LH

(Refer to REMOVAL [09/2015 - ] )

Result: D

REPLACE HEADLIGHT UNIT RH

(Refer to REMOVAL [09/2015 - ] )

Result: E

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - FRONT MULTIPLEX NETWORK LIGHT ECU)

Disconnect the B1*1 and/or B11*2 headlight connector.

*1: for LH
*2: for RH

Disconnect the B14 ECU connector.

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

Standard resistance

FOR LH

Tester Connection	Condition	Specified Condition
B1-2 (HI) - B14-6 (HLHL)	Always	Below 1 Ω
B1-1 (E) - Body ground	Always	Below 1 Ω
B1-2 (HI) or B14-6 (HLHL) - Body ground	Always	10 kΩ or higher

FOR RH

Tester Connection	Condition	Specified Condition
B11-2 (HI) - B14-5 (HLHR)	Always	Below 1 Ω
B11-1 (E) - Body ground	Always	Below 1 Ω
B11-2 (HI) or B14-5 (HLHR) - Body ground	Always	10 kΩ or higher

Result: NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result: OK

See step 10

CHECK FRONT MULTIPLEX NETWORK LIGHT ECU

Temporarily replace the front multiplex network light ECU with a new or normally functioning one.
Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Code (Refer to DTC CHECK / CLEAR [09/2015 - ] ).
Select "Clear" and clear the data.

Recheck for DTC (Refer to DTC CHECK / CLEAR [09/2015 - ] ).

RESULT

Result	Proceed to
DTC C1A6A is not output	A
DTC C1A6A is output (for LH and LED Headlight)	B
DTC C1A6A is output (for RH and LED Headlight)	C
DTC C1A6A is output (for LH and HID Headlight)	D
DTC C1A6A is output (for RH and HID Headlight)	E

Result: A

END (FRONT MULTIPLEX NETWORK LIGHT ECU IS DEFECTIVE)

Result: B

REPLACE HEADLIGHT UNIT LH

(Refer to REMOVAL [09/2015 - ] )

Result: C

REPLACE HEADLIGHT UNIT RH

(Refer to REMOVAL [09/2015 - ] )

Result: D

REPLACE HEADLIGHT UNIT LH

(Refer to REMOVAL [09/2015 - ] )

Result: E

REPLACE HEADLIGHT UNIT RH

(Refer to REMOVAL [09/2015 - ] )