Inspection Procedure

1. Connect Techstream to the DLC3.
2. Turn the ignition switch on (IG).
3. Turn Techstream on.
4. Select the following menu items: Body Electrical / Main Body / Active Test.
5. Check that the relays operate.

   Main Body: 

   DATA LIST REFERENCE
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Headlight Relay	Headlight Relay	ON/OFF	-

   OK: 

   Headlight relays operate. (LO-beam headlights illuminate.) 

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

NG: Go to next step 

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

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   ID-3 (HRLY) - Body ground	Light control switch OFF → HEAD	10 to 14 V → Below 1 V

Fig 1: Instrument Panel Junction Block Assembly Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:  Go to step  6

NG: Go to next step 

1. Disconnect the 1G engine room J/B assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connector	Condition	Specified Condition
   1G-1 - Body ground	Always	10 to 14 V

Fig 2: Identifying Engine Room J/B Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the 1G engine room J/B assembly connector.
2. Disconnect the 1D engine room J/B assembly connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   1D-9 - Body ground	Always	10 to 14 V

Fig 3: Identifying 1D Engine Room J/B Assembly Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY (POWER DISTRIBUTOR) 

OK: Go to next step 

1. Reconnect the 1D engine room J/B assembly connector.
2. Disconnect the ID instrument panel J/B assembly connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   ID-3 (HRLY) - Body ground	Always	10 to 14 V

Fig 4: Identifying ID Instrument Panel J/B Assembly Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

1. Remove the H-LP (RL) fuse and H-LP (LL) fuse from the engine room J/B assembly.
2. Measure the voltage between the loading slot of each fuse and body ground.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   H-LP (RL) Terminal - Body ground	Light control switch in HEAD	10 to 14 V
   H-LP (LL) Terminal - Body ground	Light control switch in HEAD	10 to 14 V

Fig 5: Identifying H-LP (RL) Fuse And H-LP (LL) Fuse From Engine Room J/B Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY (POWER DISTRIBUTOR) 

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (FUSE - BODY GROUND)