Toyota Venza: Taillight Relay Circuit

Toyota Venza Service Manual / Lighting (ext) / Lighting System / Taillight Relay Circuit

DESCRIPTION

The main body ECU (driver side junction block assembly) controls the operation of the TAIL relay.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Check that the relay operates.

Main Body

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

OK:

Taillight relay operates. (Taillights illuminate.)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT TAILLIGHT RELAY (TAIL)

(a) Remove the taillight relay from the main body ECU (driver side junction block assembly).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 - 5	Voltage is not applied between terminals 1 and 2	10 kΩ or higher
3 - 5	Apply the battery voltage between terminals 1 and 2	Below 1 Ω
3 - 4	Voltage is not applied between terminals 1 and 2	Below 1 Ω
3 - 4	Apply the battery voltage between terminals 1 and 2	10 kΩ or higher

REPLACE TAILLIGHT RELAY

3.	CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 2A main body ECU (driver side junction block assembly) connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
2A-1 - Body ground	Always	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to Main Body ECU (Driver Side Junction Block Assembly))

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Parking Brake Switch Circuit

DESCRIPTION The main body ECU (driver side junction block assembly) detects the condition of the parking brake switch. WIRING DIAGRAM PROCEDURE 1. READ VALUE USING TECHS ...

Headlight Beam Level Control Actuator Circuit

DESCRIPTION The headlight leveling ECU assembly actuates the headlight leveling motor according to vehicle conditions. WIRING DIAGRAM PROCEDURE 1. READ VALUE USING TECHS ...

Other materials about Toyota Venza:

Certification ECU Vehicle Information Reading/Writing Process Malfunction (B15F7)
DESCRIPTION This DTC is stored when items controlled by the certification ECU (smart key ECU assembly) cannot be customized via the audio and visual system vehicle customization screen. HINT: The certification ECU (smart key ECU assembly) controls the s ...

Air Mix Damper Control Servo Motor Circuit (Driver Side) (B1446/46)
DESCRIPTION The air mix control servo motor sends pulse signals to indicate the damper position to the A/C amplifier. The A/C amplifier activates the motor (normal or reverse) based on these signals to move the air mix damper (driver side) to any position ...

Fail-safe Chart
FAIL-SAFE CHART HINT: If the following conditions are detected while the cruise control is in operation, the system clears the stored vehicle speed in the ECM and cancels the cruise control operation. Vehicle Condition Auto Cancel ...