Toyota Corolla Cross: Leveling Motor LH Missing Message (B242487,B242587)

DESCRIPTION

Each headlight ECU sub-assembly and headlight swivel and leveling motor communicate via LIN communication.

The headlight swivel and leveling motor operates according to power supplied and automatic headlight beam level control signals from its respective headlight ECU sub-assembly and sends its operating state to the headlight ECU sub-assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B242487	Leveling Motor LH Missing Message	Detection condition: The ignition switch is ON Malfunction status: LIN communication error Malfunction duration: 10 seconds or more	Headlight unit assembly LH Headlight unit assembly RH Harness or connector Headlight ECU sub-assembly LH Headlight ECU sub-assembly RH
B242587	Leveling Motor RH Missing Message	Detection condition: The ignition switch is ON Malfunction status: LIN communication error Malfunction duration: 10 seconds or more	Headlight unit assembly RH Headlight unit assembly LH Harness or connector Headlight ECU sub-assembly LH Headlight ECU sub-assembly RH

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

Click here

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Headlight Control > Clear DTCs

NEXT

2.	CHECK FOR DTC

(a) Turn the ignition switch to ON.

(b) Wait 10 seconds or more.

(c) Check for DTCs.

Body Electrical > Headlight Control > Trouble Codes

OK:

DTC B242487 and B242587 are not output.

Result	Proceed to
DTCs are not output	A
B242487 is output	B
B242587 is output	C
B242487 and B242587 are output	D

A

USE SIMULATION METHOD TO CHECK

C

GO TO STEP 4

D

GO TO STEP 7

B

3.	INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH

*a

Component without harness connected (headlight ECU sub-assembly LH)

-

-

(a) Remove the headlight ECU sub-assembly LH.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A159-20 (LINL) - C-14 (LINLI)	Always	Below 1 Ω

OK

REPLACE HEADLIGHT UNIT ASSEMBLY LH

NG

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

4.	CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH)

(a) Disconnect the A159 headlight ECU sub-assembly LH connector.

(b) Disconnect the A160 headlight ECU sub-assembly RH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A159-20 (LINL) - A160-20 (LINL)	Always	Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.	CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (LINL TERMINAL SIGNAL OUTPUT)

*a	Front view of wire harness connector (to Headlight ECU Sub-assembly RH)

(a) Disconnect the headlight ECU sub-assembly RH connector.

(b) Using the GTS, check the waveform.

OK:

Tester Connection	Switch Condition	Specified Condition
A160-20 (LINL) - Body ground	Ignition switch ON	Pulse generation

NG

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

OK

6.	INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH

*a

Component without harness connected (Headlight ECU Sub-assembly RH)

-

-

(a) Remove the headlight ECU sub-assembly RH.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A160-20 (LINL) - C-14 (LINLI)	Always	Below 1 Ω

OK

REPLACE HEADLIGHT UNIT ASSEMBLY RH

NG

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

7.	CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH)

(a) Disconnect the A159 headlight ECU sub-assembly LH connector.

(b) Disconnect the A160 headlight ECU sub-assembly RH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A159-20 (LINL) - Body ground	Always	10 kΩ or higher
A160-20 (LINL) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Headlight Control > Clear DTCs

NEXT

9.	CHECK FOR DTC

(a) Disconnect the A160 headlight ECU sub-assembly RH connector.

(b) Turn the ignition switch to ON.

(c) Wait 10 seconds or more.

(d) Check for DTCs.

Body Electrical > Headlight Control > Trouble Codes

Result	Proceed to
B242587 is output	A
B242487 and B242587 are output	B

B

GO TO STEP 12

A

10.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Headlight Control > Clear DTCs

NEXT

11.	CHECK FOR DTC

(a) Remove the headlight ECU sub-assembly RH from headlight unit assembly RH.

Click here

(b) Reconnect the A160 headlight ECU sub-assembly RH connector.

(c) Turn the ignition switch to ON.

(d) Wait 10 seconds or more.

(e) Check for DTCs.

Body Electrical > Headlight Control > Trouble Codes

Result	Proceed to
B242587 is output	A
B242487 and B242587 are output	B

A

REPLACE HEADLIGHT UNIT ASSEMBLY RH

B

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

12.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Headlight Control > Clear DTCs

NEXT

13.	CHECK FOR DTC

(a) Remove the headlight ECU sub-assembly LH from headlight unit assembly LH.

Click here

(b) Reconnect the A159 headlight ECU sub-assembly LH connector.

(c) Turn the ignition switch to ON.

(d) Wait 10 seconds or more.

(e) Check for DTCs.

Body Electrical > Headlight Control > Trouble Codes

Result	Proceed to
B242487 is output	A
B242487 and B242587 are output	B

A

REPLACE HEADLIGHT UNIT ASSEMBLY LH

B

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

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