Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM ACTIVE TEST BY TECHSTREAM

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Body Electrical / Main Body / Active Test.

Check the operation.

Main Body (Main Body ECU)

MAIN BODY (MAIN BODY ECU)

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

OK:

Headlight comes on.

OK: Go to step 7

NG: Go to next step

INSPECT FUSE (HEAD LL, HEAD RL)
1. Remove the HEAD LL fuse and HEAD RL fuse from the engine room No. 2 relay block.
2. Measure the resistance of the fuses.
  Standard resistance:
  
  Below 1 Ω
NG: REPLACE FUSE

OK: Go to next step

INSPECT HEADLIGHT RELAY (Marking: HEAD)

Remove the headlight relay from the engine room No. 2 relay block.

Measure the resistance of the relay.

Standard resistance

STANDARD RESISTANCE

Tester Connection	Specified Condition
3 - 5	10 kΩ or higher
3 - 5	Below 1 Ω (Battery voltage applied to terminals 1 and 2)

Fig 1: Inspecting Headlight Relay (Marking - HEAD)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE HEADLIGHT RELAY

OK: Go to next step

INSPECT BULB (HEADLIGHT BULB)
1. Remove the headlight bulbs (LOW).
2. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1, then check that the bulb illuminates.
  OK:
  
  Bulb illuminates.
  
  Fig 2: Identifying Headlight Bulb Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE BULB

OK: Go to next step

CHECK WIRE HARNESS (MAIN BODY ECU - BATTERY)

Disconnect the E15 main body ECU connector.

Measure the voltage of the wire harness side connector.

Standard voltage

STANDARD VOLTAGE

Tester Connection	Specified Condition
E15-20 (HRLY) - Body ground	10 to 14 V

Fig 3: Identifying E15 Main Body ECU Connector Terminal (HRLY)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

CHECK INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)

Measure the voltage of the main body ECU.

Standard voltage

STANDARD VOLTAGE

Tester Connection	Condition	Specified Condition
E15-20 (HRLY) - Body ground	Light control switch OFF	10 to 14 V
E15-20 (HRLY) - Body ground	Light control switch HEAD	Below 1 V

Fig 4: Checking Instrument Panel Junction Block (Main Body ECU)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)

OK: REPAIR OR REPLACE HARNESS AND CONNECTOR (HEAD RELAY - HEADLIGHT BULB AND BODY GROUND)

CHECK WIRE HARNESS (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU)

Fig 5: Identifying Headlight Dimmer Switch And Main Body ECU Connector Terminals

Disconnect the E17 main body ECU connector.
Disconnect the E12 headlight dimmer switch connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

STANDARD RESISTANCE

Tester Connection	Specified Condition
E17-12 (HEAD) - E12-20 (H)	Below 1 Ω
E17-12 (HEAD) or E12-20 (H) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

INSPECT HEADLIGHT DIMMER SWITCH

Disconnect the E12 headlight dimmer switch.

Measure the resistance of the switch.

Standard resistance

STANDARD RESISTANCE

Tester Connection	Switch Condition	Specified Condition
18 (T) - 12 (EL)	TAIL	Below 1 Ω
18 (T) - 12 (EL)	OFF	10 kΩ or higher
20 (H) - 12 (EL)	HEAD	Below 1 Ω
20 (H) - 12 (EL)	OFF	10 kΩ or higher
16 (HL) - 12 (EL)	LOW	Below 1 Ω
16 (HL) - 12 (EL)	HIGH	10 kΩ or higher

Fig 6: Identifying E12 Headlight Dimmer Switch Connector Terminals

NG: REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY

OK: REPAIR OR REPLACE HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - BODY GROUND)