Low Beam Headlight Circuit (From 08/2009): Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. Check that the relays operate.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range
   Headlight Relay	Headlight relays	ON/OFF

   OK

   Headlight relays operate. (Low beam headlights illuminate.)

NG → See step   2 

OK → See step   8 

1. Remove the power distributor (engine room junction block assembly) from the engine room relay block. Refer to COMPONENTS .
   Fig 1: Inspecting Power Distributor (Engine Room Junction Block Assembly)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect a positive (+) lead from the battery to terminal 3A-1
3. Connect a negative (-) lead from the battery to terminals 3C-13 and 3C-17.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   3B-3 - Battery negative	Always	11 to 14 V
   3B-4 - Battery negative	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Power Distributor (Engine Room Junction Block Assembly))

NG → See step   9 

OK: Go to next step 

1. Disconnect the 3A power distributor (engine room junction block assembly) connector.
   Fig 2: Identifying 3A Power Distributor Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connector	Condition	Specified Condition
   3A-1 - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Power Distributor (Engine Room Junction Block Assembly))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the 3C power distributor (engine room junction block assembly) connector.
   Fig 3: Identifying 3C Power Distributor (Engine Room Junction Block Assembly) Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3C-17 - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Power Distributor (Engine Room Junction Block Assembly))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the 3C power distributor (engine room junction block assembly) connector.
   Fig 4: Identifying 3C Power Distributor (Engine Room Junction Block Assembly) & 2F Instrument Panel Junction Block Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the 2F instrument panel junction block assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3C-13 - 2F-37	Always	Below 1 Ω
   3C-13 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Power Distributor (Engine Room Junction Block Assembly))
   *2	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the instrument panel junction block assembly.
   Fig 5: Identifying 2F Instrument Panel Junction Block Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2F-37 - A-15 (HRLY)	Always	Below 1 Ω
   2F-37 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Instrument Panel Junction Block Assembly)

NG → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

OK → See step   7