Inspection Procedure

1. Remove the H-LP LVL fuse from the passenger side junction block.
2. Measure the resistance of the fuse.

   Standard resistance: Below 1 Ω 

NG: REPLACE FUSE 

OK: Go to next step. 

1. Disconnect the A31 ECU connector.
   Fig 1: Identifying A31 ECU Connectors Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage and resistance of the wire harness side connector.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A31-2 (IG) - Body ground	Ignition switch ON	10 to 14 V

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   A31-1 (E1) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step. 

1. Disconnect the A31 and D2 ECU connectors.
   Fig 2: Identifying A31 And D2 ECU Connectors Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the front light ECU from the engine room relay block.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   A31-5 (MPX1) - Relay block front light ECU terminal 6 (MPX2)	Below 1 Ω
   A31-6 (MPX2) - D2-15 (MPX1)	Below 1 Ω

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   Both are OK	A
   One is OK	B
   Both are NG	C

B: REPLACE AFS ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR 

C: REPAIR OR REPLACE HARNESS AND CONNECTOR 

A: REPLACE AFS ECU