Headlight (HI-BEAM) Circuit: Procedure

PERFORM ACTIVE TEST USING TECHSTREAM (HIGH BEAM HEADLIGHT)

Using the Techstream, perform the Active Test. Refer to DATA LIST / ACTIVE TEST .

MAIN BODY

Tester Display	Test Part	Control Range	Diagnostic Note
Daytime Running Light	Daytime running light system	ON/OFF	-
Head Light Hi	High beam headlight relay	ON/OFF	-

Relay operates (high beam headlights illuminate).

NG → See step 2

OK → See step 5

CHECK HARNESS AND CONNECTOR (BATTERY - RUNNING LIGHT RELAY)

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

Fig 1: Identifying Running Light Relay Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

Tester Connection	Condition	Specified Condition
Running light relay terminal 6 (+B) - Body ground	Always	11 to 14 V

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Running Light Relay)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - MAIN BODY ECU AND BODY GROUND)

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

Standard Resistance

Tester Connection	Condition	Specified Condition
Running light relay terminal 4 (H) - G47-15 (DIM)	Always	Below 1 Ω
Running light relay terminal 2 (DRLS) - A-25 (DRL)	Always	Below 1 Ω
Running light relay terminal 3 (E) - Body ground	Always	Below 1 Ω
Running light relay terminal 4 (H) - Body ground	Always	10 kΩ or higher
Running light relay terminal 2 (DRLS) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 4

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL