Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSTOYOTA2009SEQUOIA 4WD V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISLIGHTING AND HORNSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSEXTERIOR LIGHTING SYSTEMDRL RELAY CIRCUIT
2009 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)
DRL Relay Circuit
2009 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)SECTION DRL Relay Circuit
LIGHTING (EXT): LIGHTING SYSTEM: DRL Relay Circuit
DRL Relay Circuit
DESCRIPTION
The daytime running light relay is built into the turn signal flasher assembly.
When the daytime running light relay receives the ignition switch ON signal from the main body ECU, the turn signal flasher assembly illuminates the turn signal lights. When the daytime running light relay receives the headlight dimmer switch signal, the turn signal flasher assembly turns off the turn signal lights.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. INSPECT MAIN BODY ECU
(a) Disconnect the H3 main body ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER ASSEMBLY - MAIN BODY ECU)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER ASSEMBLY - MAIN BODY ECU)
(a) Disconnect the H39 turn signal flasher assembly connector.
(b) Disconnect the H3 main body ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(d) Reconnect the main body ECU connector.
(e) Reconnect the turn signal flasher assembly connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE TURN SIGNAL FLASHER ASSEMBLY
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.