DTC B2412 Headlight Swivel Motor LH Malfunction: DTC B2413 Headlight Swivel Motor RH Malfunction: Wiring Diagram

Fig 1: Wiring Diagram - Headlight Swivel Motor

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the intelligent tester main switch on.
Select the "ACTIVE TEST" on the intelligent tester.
Check swivel motor operates with the intelligent tester.

ACTIVE TEST: AFS ECU

ACTIVE TEST: AFS ECU REFERENCE

Item	Test Details	Diagnostic Note
SWIVEL MTR (RH)	Drive the swivel motor RIGHT / OFF	-
SWIVEL MTR (LH)	Drive the swivel motor LEFT / OFF	-

OK:

Swivel motor operates.

Result

RESULT REFERENCE

Result	Proceed to
OK (When checking from PROBLEM SYMPTOMS TABLE)	A
OK (When checking from DIAGNOSTIC TROUBLE CODE CHART)	B
NG	C

B : REPLACE AFS ECU

C : Go to step 2

A : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

INSPECT HEADLIGHT ASSEMBLY

Fig 2: Identifying B12 And B2 Headlight Assembly Connectors

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Disconnect the B12 and B2 headlight assembly connectors.
Measure the resistance according to the value(s) in the table below.

Standard resistance:

LH Side (B2412)

SPECIFIED CONDITION AND TESTER CONNECTION

Tester Connection	Condition	Specified Condition
B12-23 (BL1-) - B12-24 (BL1+)	Always	6 to 8 Ω
B12-21 (BL2-) - B12-22 (BL2+)	Always	6 to 8 Ω

RH Side (B2413)

SPECIFIED CONDITION AND TESTER CONNECTION

Tester Connection	Condition	Specified Condition
B2-23 (BL1-) - B2-24 (BL1+)	Always	6 to 8 Ω
B2-22 (BL2-) - B2-21 (BL2+)	Always	6 to 8 Ω

HINT:

Measure the resistance after the headlight has cooled.

NG : REPLACE HEADLIGHT ASSEMBLY

OK: Go To Next Step

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - AFS ECU)

Fig 3: Identifying A28 AFS ECU Connector Terminal

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Disconnect the A28 AFS ECU connector.
Disconnect the B12 and B2 headlight connectors.
Measure the resistance according to the value(s) in the table below.

Standard resistance:

SPECIFIED CONDITION AND TESTER CONNECTION

Tester Connection	Condition	Specified Condition
A28-25 (BL1+) - B12-24 (BL1+)	Always	Below 1 Ω
A28-26 (BL1-) - B12-23 (BL1-)	Always	Below 1 Ω
A28-27 (BL2+)- B12-22 (BL2+)	Always	Below 1 Ω
A28-28 (BL2-) - B12-21 (BL2-)	Always	Below 1 Ω
A28-19 (SMGL) - B12-19 (SMGL)	Always	Below 1 Ω
A28-24 (SML) - B12-18 (SML)	Always	Below 1 Ω
A28-22 (SMBL) - B12-20 (SMBL)	Always	Below 1 Ω
A28-29 (LL1+) - B12-15 (LL1+)	Always	Below 1 Ω
A28-30 (LL1-) - B12-14 (LL1-)	Always	Below 1 Ω
A28-31 (LL2+) - B12-13 (LL2+)	Always	Below 1 Ω
A28-32 (LL2-) - B12-12 (LL2-)	Always	Below 1 Ω
A28-25 (BL1+)- Body ground	Always	10 kΩ or higher
A28-26 (BL1-) - Body ground	Always	10 kΩ or higher
A28-27 (BL2+) - Body ground	Always	10 kΩ or higher
A28-28 (BL2-) - Body ground	Always	10 kΩ or higher
A28-19 (SMGL) - Body ground	Always	10 kΩ or higher
A28-24 (SML) - Body ground	Always	10 kΩ or higher
A28-22 (SMBL) - Body ground	Always	10 kΩ or higher
A28-29 (LL1+) - Body ground	Always	10 kΩ or higher
A28-30 (LL1-) - Body ground	Always	10 kΩ or higher
A28-31 (LL2+) - Body ground	Always	10 kΩ or higher
A28-32 (LL2-) - Body ground	Always	10 kΩ or higher

RH Side (B2413)

SPECIFIED CONDITION AND TESTER CONNECTION

Tester Connection	Condition	Specified Condition
A28-9 (BR1+) - B2-24 (BR1+)	Always	Below 1 Ω
A28-10 (BR1-) - B2-23 (BR1-)	Always	Below 1 Ω
A28-11 (BR2+) - B2-22 (BR2+)	Always	Below 1 Ω
A28-12 (BR2-) - B2-21 (BR2+)	Always	Below 1 Ω
A28-18 (SMGR) - B2-19 (SMGR)	Always	Below 1 Ω
A28-21 (SMBR) - B2-20 (SMR)	Always	Below 1 Ω
A28-23 (SMR) - B2-18 (SMBR)	Always	Below 1 Ω
A28-13 (LR1+) - B2-15 (LR1+)	Always	Below 1 Ω
A28-14 (LR1-) - B2-14 (LR1-)	Always	Below 1 Ω
A28-15 (LR2+) - B2-13 (LR2+)	Always	Below 1 Ω
A28-16 (LR2-) - B2-12 (LR2-)	Always	Below 1 Ω
A28-9 (BR1+) - Body ground	Always	10 kΩ or higher
A28-10 (BR1-) - Body ground	Always	10 kΩ or higher
A28-11 (BR2+) - Body ground	Always	10 kΩ or higher
A28-12 (BR2-) - Body ground	Always	10 kΩ or higher
A28-18 (SMGR) - Body ground	Always	10 kΩ or higher
A28-21 (SMBR) - Body ground	Always	10 kΩ or higher
A28-23 (SMR) - Body ground	Always	10 kΩ or higher
A28-13 (LR1+) - Body ground	Always	10 kΩ or higher
A28-14 (LR1-)- Body ground	Always	10 kΩ or higher
A28-15 (LR2+) - Body ground	Always	10 kΩ or higher
A28-16 (LR2-) - Body ground	Always	10 kΩ or higher

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go To Next Step

CHECK AFS ECU

Fig 4: Identifying B12 And B2 Headlight Connectors

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Disconnect the B12 and B2 headlight connectors.
Measure the voltage according to the value(s) in the table below.

Standard voltage:

LH Side (B2412)

SPECIFIED CONDITION AND TESTER CONNECTION

Tester Connection	Condition	Specified Condition
B12-20 (SMBL) - B12-19 (SMGL)	Engine switch off	Below 1 V
B12-20 (SMBL) - B12-19 (SMGL)	Engine switch on (IG)	4.5 to 5.5 V

RH Side (B2413)

SPECIFIED CONDITION AND TESTER CONNECTION

Tester Connection	Condition	Specified Condition
B2-20 (SMBR) - B2-19 (SMGR)	Engine switch off	Below 1 V
B2-20 (SMBR) - B2-19 (SMGR)	Engine switch on (IG)	4.5 to 5.5 V

NG : REPLACE AFS ECU

OK: Go To Next Step

REPLACE HEADLIGHT ASSEMBLY
1. Temporarily replace the headlight assembly with a new or normally functioning one.
2. Check that headlight assembly operates.
OK:

Return to normal operation.

NG : REPLACE AFS ECU

OK : END