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:

Brake Signal Malfunction (B2284)
DESCRIPTION The power management control ECU receives brake signal information from 2 sources. It receives a signal from the stop light switch assembly via a direct line, and a signal from the ECM via CAN. If the information from these 2 sources is incons ...

Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE NO. 2 ANTENNA CORD SUB-ASSEMBLY (w/o Sliding Roof) 2. REMOVE NO. 2 ANTENNA CORD SUB-ASSEMBLY (w/ Sliding Roof) 3. REMOVE VANITY LIGHT ASSEMBLY (a) Remove the vanity light assembly (See page ). HINT: Use the same p ...

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION (a) The certification ECU (smart key ECU assembly) control the vehicle smart key system functions. Smart key system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3). In ...